the primary consumer in those photos would be C
Answer:
c
Explanation:
a is not a primary consumer
b is also not primary consumer
c is a primary consumer and,
d is not so,
c is a primary consumer
hope this helps!
The element chorine is represented by symbol ____. (Capitalization is important.)
the element chlorine is represented by the symbol Cl
All first letters on the Periodic Table are Capitalized. The answer is Cl.
Which property do gas particles at the same temperature share?
A.) Potential energy
B.) Pressure
C.) Average kinetic energy
D.) Volume
Average kinetic energy
hope this helps :)
The next vice I think it's c
At night, low temperatures can cause rocks to:
melt
contract
expand
At night, low temperatures can cause rocks to CONTRACT.
Answer:
They can cause rocks to contract
Explanation:
if the rocks melt it would have to either be really hot or a chemical reaction and when rocks expand that would need heat so the last answer that is left is contract.
HOPE THIS HELPS
Which of the following statements is correct in regards to density?
A-Pressure is directly proportional to density.
B-Pressure is inversely proportional to density.
C-Temperature is directly proportional to density.
D-Temperature and pressure do not affect density.
Pressure is directly related to density implies increase in pressure results in increase in density. Hopes this helps,love! <3
Answer:
Pressure is directly proportional to density.
Explanation:
To what volume must 480.0 mL of 3.50 M Cu(NO3)2 be diluted to produce 2.10 M Cu(NO3)2?
Answer:
800 mL
Explanation:
This is a dilution question so we have to use the dilution formula
c1v1 = c2v2
Where c1 is the concentration and v1 is the volume of the concentrated solution
And c2 is concentration and v2 is volume of the diluted solution to be prepared
Substituting the values in the equation
3.50 M x 480.0 mL = 2.10 M x v2
v2 = 800 mL
A volume of 480.0 mL of 3.50 M solution should be diluted upto a volume of 800 mL to make a diluted copper nitrate solution of concentration 2.10 M
Which of the following leads to a higher rate of diffusion?
Cooled gas
Higher molar mass of particles
Higher velocity of particles
Reduced temperature
Higher velocity of particles
Explanation;The diffusion rate is determined by a variety of factors which includes;
Temperature such that the higher the temperature, the more kinetic energy the particles will have, so they will move and mix more quickly and the diffusion rate will be high.Concentration gradient such that the greater the difference in concentration, the quicker the rate of diffusion.Higher velocity of particles increases the diffusion rate as this means more kinetic energy by the particles and hence the particles will mix and move faster, thus higher diffusion rate.The correct answer is c. Higher velocity of particles leads to a higher rate of diffusion.
Diffusion is the process by which particles spread out from an area of high concentration to an area of lower concentration. The rate of diffusion is influenced by several factors, including the temperature, the molar mass of the particles, and the velocity of the particles.
1. Temperature: Increased temperature results in higher kinetic energy of the particles, which increases their velocity. Therefore, higher temperatures lead to a higher rate of diffusion. Conversely, cooled gas (reduced temperature) would have a lower rate of diffusion.
2. Molar Mass: Heavier particles (higher molar mass) move more slowly than lighter particles because they have more mass to move. Therefore, gases with a lower molar mass diffuse more quickly than those with a higher molar mass.
3. Velocity of Particles: The rate of diffusion is directly proportional to the average velocity of the particles. Faster-moving particles will spread out more quickly, leading to a higher rate of diffusion
In summary, higher velocity of particles is the factor that leads to a higher rate of diffusion. This is because faster-moving particles cover more distance in a given time, leading to a quicker spread of particles from high to low concentration areas.
Water can dissolve other substances. Which factor best contributes to this property of water? Water is made up of ionic bonds. Water has weak intermolecular forces. Water is denser than most substances. Water particles are not fixed in place.
Answer: D. Water particles are not fixed in place.
Answer:
D
Explanation:
because it is right
Why isn’t the atomic mass always a whole number?
Atomic mass is never an integer number for several reasons: The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes. Being an average it would be most unlikely to be a whole number. The mass of an individual atom in atomic mass units is the mass relative to carbon-12.
Answer:
This is because the atomic mass ir usually calculated as the weighted average of the masses of the different isotopes of each element taking into account the relative abundance of each of them.
Explanation:
The isotopes of an element are those in which its atomic numbers (that is, the number of protons) are equal, but the number of neutrons is different. Record that protons and neutrons are found in the nucleus of the element. The same chemical element may consist of different atoms, that is, different isotopes. Then the atomic mass of an element is the weighted average mass of its natural isotopes. Therefore, the atomic mass of an element is not an integer. The weighted average means that not all isotopes have the same percentage. In other words, the atomic masses of the chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element taking into account the relative abundance of each of them.
This produces that the atomic mass don't always be a whole number
Who performed the oil-drop experiment?
In the year 1909, Robert A. Millikan and Harvey Fletcher performed the oil drop experiment.
Answer:
Robert Millikan
Explanation:
(APEX)
A chemistry student weighs out 0.0634g of formic acid HCHO2 into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1800M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Be sure your answer has the correct number of significant digits.
7.65 × 10⁻³ L.
3 sig. fig. as in the mass of formic acid.
ExplanationHow many moles of formic acid?
Relative atomic mass from a modern periodic table:
H- 1.008,C- 12.011, andO- 15.999.Molar mass of formic acid [tex]\text{HCOOH}[/tex]:
[tex]1.008 + 12.011 + 2\times 15.999 + 1.008 = 46.025\;\text{g}\cdot \text{mol}^{-1}[/tex].
Number of moles of formic acid molecules in the 0.0634 gram sample:
[tex]\displaystyle n = \frac{m}{M} = \frac{0.0634}{46.025} = 1.37751\times 10^{-3}\;\text{mol}[/tex].
Keep at least one extra sig. fig. to avoid rounding errors.
How many moles of NaOH?
It takes one [tex]\text{OH}^{-}[/tex] ion to neutralize each carbonyl group [tex]-\text{COOH}[/tex].
There's one carbonyl group in each formic acid [tex]\text{H-}\text{COOH}[/tex] molecule. Each formula unit of NaOH supplies one [tex]\text{OH}^{-}[/tex] ion. As a result, it takes one mole formula units of NaOH to neutralize one mole formic acid molecules.
There are [tex]1.37751\times 10^{-3}\;\text{mol}[/tex] of formic acid in the volumetric flask. It will take the same number of NaOH formula units to reach the equivalence point.
How many liters of NaOH?
[tex]\displaystyle V = \frac{n}{c} = \frac{1.37751\times 10^{-3}\;\text{mol}}{0.1800\;\text{M}}= \frac{1.37751\times 10^{-3}\;\text{mol}}{0.1800\;\text{mol}\cdot\text{L}^{-1}} = 7.65\times 10^{-3}\;\text{L}[/tex].
How many significant figures?
Number of sig. fig. in data involved in the calculation:
3 in the mass of the formic acid,4 in the concentration of NaOH.Take the least number of sig. fig. as the number of sig. fig. in the answer. As a result, the volume of NaOH should be rounded to three sig. fig.
To solve the given titration calculation, first convert the given weight of formic acid into moles. Since formic acid and NaOH react in a 1:1 ratio, the same amount of moles of NaOH is needed. Then, use the molarity of NaOH to find the volume in liters (or milliliters), which comes out to be 7.67 mL.
Explanation:The question involves a titration calculation, which requires knowledge of stoichiometry. Given the weight of formic acid, we first need to calculate the number of moles of it and then use stoichiometry to calculate the equivalent volume of 0.1800M NaOH needed to neutralize the acid.
First, convert the weight of the formic acid (HCHO2) into moles using its molar mass (46.03 g/mol). So, moles of formic acid = 0.0634g / 46.03 g/mol = 0.00138 mol.
Formic acid and NaOH react in a 1:1 ratio, so moles of NaOH needed = moles of formic acid = 0.00138 mol.
Now, use the molarity of NaOH to find the volume. Volume = moles / molarity = 0.00138 mol / 0.1800 mol/L = 0.00767L or 7.67 mL. This is the volume of NaOH solution needed to reach the equivalence point.
Learn more about Titration here:https://brainly.com/question/31271061
#SPJ3
Which unit is not a measurement of volume?
cm
L
ml
cm3
Which unit is not a measurement of volume?
cm
L
ml
cm³
Cm is a measurement for length
Since cm is the unit for the measurement of length, it has not been used to measure volume. L, ml, and cm3 are the units for the measurement of volume.
Volume can be described as the space occupied by the liquid. The liquid has no specific shape however they can attain the shape of the container in which they are kept.
The unit has been used to describe or measure a specific parameter. Units can be interconverted from one to another and help in the equivalent value in another unit.
The unit for the length, volume, weight are all assigned by the standard methods.
The centimeter is the unit of length and has been used for the measurement of matter in terms of length. It can give the length of a piece of land, cloth, etc.
liter, milliliter, and centimeter cube have been the value that has been used for the measurement of the volume.
Since cm is the unit for the measurement of length, it has not been used to measure volume. L, ml, and cm3 are the units for the measurement of volume.
For more information about the measurement unit, refer to the link:
https://brainly.com/question/14026238
Which two elements will most likely form an ionic bond?
Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
Answer:
B. Magnesium and Bromine
Explanation:
Magnesium is you solid based element in the compound or bond. With ability to conduct electricity when applied to bromine your non-metal. Bromine is one of the two liquids on the periodic table along with mercury so it can be tricky to test in water. Lastly the test in Edgenuity( or wherever you took this test) the first answer krypton and lithium could be a possible answer, but on the test your correct answer is B. Magnesium and Bromine.
Thank You...
Modern atomic theory states that atoms are neutral. How is this neutrality achieved?
Well, in an atom, there are an equal number of protons and electrons so they cancel each other out.
okayy so in atom there is an equivalent amount of protons AND electrons , meaning they would cancel each other out.
WHAT IS AN ALKANE
WHAT IS AN ALKENE
Final answer:
Alkanes are saturated hydrocarbons with only single bonds, following the formula CnH2n+2, whereas alkenes are unsaturated with at least one double bond and follow the formula CnH2n. The double bond in alkenes makes them more reactive than alkanes, and their naming involves the '-ene' suffix with the bond position indicated numerically.
Explanation:
Understanding Alkanes and Alkenes
Before discussing the complexities of alkenes, it's important to grasp what an alkane is. Alkanes are hydrocarbons, which mean they consist only of carbon and hydrogen atoms. They are saturated compounds that follow the general formula CnH2n+2 and are characterized by single bonds between carbon atoms. Common names for alkanes include paraffin hydrocarbons or acyclic saturated hydrocarbons. A key feature of alkanes is that they do not contain double bonds, triple bonds, or rings in their structure.
In contrast, alkenes are hydrocarbons that contain at least one carbon-carbon double bond, falling under the general molecular formula CnH2n. This double bond makes alkenes unsaturated hydrocarbons and more reactive than alkanes. Alkenes are also known as olefins, highlighting their capacity for reactions due to the presence of the double bond. When naming alkenes, the '-ane' ending of the parent hydrocarbon chain is replaced with '-ene', and the position of the double bond is indicated with a number in front of the name.
Final answer:
An alkane is a compound of carbon and hydrogen without double bonds or rings. Alkenes are hydrocarbons containing carbon-carbon double bonds.
Explanation:
An alkane is a compound of carbon and hydrogen only, without double bonds, triple bonds, or rings. They all conform to the general formula CnH₂ and are sometimes called paraffin hydrocarbons or acyclic hydrocarbons.
Alkenes are a family of hydrocarbons containing a carbon-carbon double bond. They are unsaturated compounds and have the general formula CnH₂n. Alkenes are more reactive than alkanes due to their double bond.
Which of the following would have the highest vapor pressure?
A.
1.0 M solution of ionic compound sodium chloride (NaCl)
B.
1.0 M solution of ionic compound potassium chloride (KCl)
C.
1.0 M solution of molecular compound sucrose (C12H22O11)
D.
pure water
In the vapour pressure of solution when the solute is mixed in water it will less than the actual solvent so the correct answer is pure water as it is universal solvent therefore water can disolve so many sustances in it
Read more on Brainly.com - https://brainly.com/question/1601417#readmore
Answer : The correct options is, (D) Pure water.
Explanation :
According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.
Formula used :
[tex]\frac{\Delta p}{p^o}=i\times X_B[/tex]
where,
[tex]p^o[/tex] = vapor pressure of the pure component (water)
[tex]p_s[/tex] = vapor pressure of the solution
[tex]X_B[/tex] = mole fraction of solute
i = Van't Hoff factor
(A) The dissociation of 0.1 M [tex]NaCl[/tex] will be,
[tex]NaCl\rightarrow Na^++Cl^-[/tex]
So, Van't Hoff factor = Number of solute particles = [tex]Na^++Cl^-[/tex] = 1 + 1 = 2
(B) The dissociation of 0.1 M [tex]KCl[/tex] will be,
[tex]KCl\rightarrow K^++Cl^-[/tex]
So, Van't Hoff factor = Number of solute particles = [tex]K^++Cl^-[/tex] = 1 + 1 = 2
(C) [tex]C_{12}H_{22}O_{11}[/tex], sucrose is a non-electrolyte solute that means they retain their molecularity, and not undergo association or dissociation.
So, Van't Hoff factor = 1
(D) Pure water : As we know that the vapor pressure of a pure solvent is always greater than the vapor pressure of a solution that containing a non-volatile liquid.
As we know that the vapor pressure is depend on the Van't Hoff factor but the vapor pressure of a pure solvent is always greater.
Hence, from this we conclude that, the pure water have the highest vapor pressure.
The pH of an aqueous solution is 4.32. What is the [OH–]?
A.
6.4 x 10–1 M
B.
4.8 x 10–5M
C.
2.1 x 10–10 M
D.
1.6 x 10–14M
C. 2.1 x 10–10 M
Explanation;pKw=pH + pOH = 14
pOH = 14-4.32
=9.68
But; pOH = -log[OH]
[OH-]=10^(-9.68)
=2.089x10^-10M
≈ 2.1 x 10–10 MAnswer: The concentration of hydroxide ion concentration is [tex]2.08\times 10^{-10}[/tex]
Explanation:
pH is defined as negative logarithm of hydrogen ion concentration. It is basically defined as the power of hydrogen ions in a solution.
To calculate the hydroxide ion concentration of the solution, we need to determine the pOH of the solution first and to do so, we calculate the pOH by the following equation:
[tex]pH+pOH=14\\pOH=14-4.32=9.68[/tex]
pOH is defined as negative logarithm of hydroxide ion concentration. It is basically defined as the power of hydroxide ions in a solution.
The equation used to calculate pOH of the solution is given as:
[tex]pOH=-\log[OH^-][/tex]
pOH of the solution = 9.68
Putting values in above equation, we get:
[tex]9.4=-\log[OH^-][/tex]
[tex][OH^-]=antilog(-9.68)[/tex]
[tex][OH^-]=2.08\times 10^{-10}[/tex]
Hence, the concentration of hydroxide ion concentration is [tex]2.08\times 10^{-10}[/tex]
Which of the following is not a polyatomic ion
B: CaCO₃ is a compound in and of itself thus it is not a polyatomic ion.
What is the mass of 25.0 grams of HF
Answer:
1.25 moles of HF
Explanation:
1 mole = 20.0 grams of HF
So, to calculate mass of 25.0 grams
=25.0*1/20.0
=1.25 moles
soil formation is a ____ geologic ____ that creates soil from sediment.
A) Destructive; event
B) Constructive; event
C) Destructive; process
D) Constructive; process
D) Constructive; process
Answer:
D) Destructive; process
Explanation:
A solution of 20.0 g of which hydrated salt dissolved in
200 g H2O will have the lowest freezing point?
(A) CuSO4 • 5 H2O (M = 250)
(B) NiSO4 • 6 H2O (M = 263)
(C) MgSO4 • 7 H2O (M = 246)
(D) Na2SO4 • 10 H2O (M = 286)
Thank you so much for your help and explanation :)
Answer:
(D) Na₂SO₄•10H₂O (M = 286).
Explanation:
The depression in freezing point of water by adding a solute is determined using the relation:ΔTf = i.Kf.m,
Where, ΔTf is the depression in freezing point of water.
i is van't Hoff factor.
Kf is the molal depression constant.
m is the molality of the solute.
Since, Kf and m is constant for all the mentioned salts. So, the depression in freezing point depends strongly on the van't Hoff factor (i).van't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.(A) CuSO₄•5H₂O:
CuSO₄ is dissociated to Cu⁺² and SO₄²⁻.
So, i = dissociated ions/no. of particles = 2/1 = 2.
B) NiSO₄•6H₂O:
NiSO₄ is dissociated to Ni⁺² and SO₄²⁻.
So, i = dissociated ions/no. of particles = 2/1 = 2.
(C) MgSO₄•7H₂O:
MgSO₄ is dissociated to Mg⁺² and SO₄²⁻.
So, i = dissociated ions/no. of particles = 2/1 = 2.
(D) Na₂SO₄•10H₂O:
Na₂SO₄ is dissociated to 2 Na⁺ and SO₄²⁻.
So, i = dissociated ions/no. of particles = 3/1 = 3.
∴ The salt with the high (i) value is Na₂SO₄•10H₂O.
So, the highest ΔTf resulted by adding Na₂SO₄•10H₂O salt.
A combustion analysis of a 0.503 g sample of an unknown hydrocarbon yields 1.53 g CO 2 2 and 0.756 g H 2 2 O. What is the empirical formula of the sample? Give your answer in the form C#H# where the number following the element’s symbol corresponds to the subscript in the formula. (Don’t include a 1 subscript explicitly). For example, the formula CH 2 2 O would be entered as CH2O
Answer:
C₅H₁₂.
Explanation:
The hydrocarbon is burned in excess of oxygen to give CO₂ and H₂O.The no. of moles of CO₂ produced = mass/molar mass = 1.53 g/44.0 g/mol = 0.03477 mol.Which is corresponding to 0.03477 mol of C.
The no. of moles of H₂O produced = mass/molar mass = 0.756 g/18.0 g/mol = 0.042 mol.
which corresponds to (0.042 x 2) = 0.084 moles of hydrogen.
The ratio of the number of moles of hydrogen to carbon in the composition of the compound will be 0.084 / 0.03477 = 2.4 = 12/5.
Therefore, the empirical formula of the compound under consideration is C₅H₁₂.
Which of the following describes a covalent bond?
a)It is the exchange of electrons between atoms with an electronegativity difference above 1.7.
b)It is the exchange of electrons between atoms with an electronegativity difference below 1.7.
c)It is the sharing of electrons between atoms with an electronegativity difference above 1.7.
d)It is the sharing of electrons between atoms with an electronegativity difference below 1.7.
I think it is C, because a covalent bond is a distribution of 2 atoms to 1 electron, meaning they are sharing and not exchanging, and the electronegravity would be above 1.7
Answer:
It is the sharing of electrons between atoms with an electronegativity difference below 1.7.
Explanation:
Covalent bond is the bond which is formed with the sharing of the electrons between the two atoms which are taking part in the bond. It is generally formed between the atoms with similar electronegativity values.
It is the bond which is generally occurs within non metals as they share electrons to complete their octet.
The difference in the electronegativity values of the atoms involving in a covalent bond must not exceed the value of 1.7 .
Correct answer:- It is the sharing of electrons between atoms with an electronegativity difference below 1.7.
What is a base? chemistry
Answer:
A base is A. a substance that increace the concentration of OH- ions in solution.
Explanation:
According to Arrhenius Theory, a base is any substance that, when dissolved, releases hydroxyl ions (OH–). The bases are also known as alkalis, because when the hydroxyl groups dissociate and release, the pH of the solutions increases, that is, the solution becomes alkaline. Then its pH is greater than 7.
According to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H +) in solution.
According to Lewis Theory, the bases are also considered those substances capable of donating or transferring electrons.
So, a base is A. a substance that increace the concentration of OH- ions in solution.
12.47 g of ammonium nitrate are dissolved in water, then diluted to 250 ml. What is the molarity of the resulting solution?
= 0.6224 M
Explanation;Molarity is given by the formula;
Molarity = Number of moles/Volume
But moles = mass/Molar mass
Thus;
Moles = 12.47 g/80.043 g/mol
= 0.1556 Moles
Therefore;
Molarity = 0.1556 moles/0.25
= 0.6224 MThe equation shown represents cellular respiration. Glucose + X → Y + Water + Energy What do X and Y most likely represent?
x=oxygen y=carbon dioxide
why does the earth have a liquid water supply and the moon does not
Because the Earth has biological ecosystems that ensure a supply of liquid water, inlcuding an atmosphere, living plant life and gaseous exchange systems that enable liquid water to be produced. None of this applies to the Moon.
Answer:
Because the gravity of the earth, unlike the gravity of the moon, is sufficient so that the earth's water does not evaporate or drain into space.
Explanation:
The most widely accepted explanation of how water on earth came about says that comets and asteroids - which have water in their constitution - bombarded our planet and left that element on its surface. Since the earth and the moon are so close together and occupy almost the same place in space, it is to be imagined that these comets and asteroids also hit the moon and leave water reserves there. However, the moon's gravity is much lower than the earth's gravity. This low moon gravity caused most of its water reservoir to evaporate or drain into space.
How can you know if evolution has occured within species?
You can use the HWE (Hardy Weinberg Equilibrium) equations :
p + q = 1
p^2 + 2pq + q^2 = 1
If the allele combinations do not equal one after a while, evolution has occurred.
calculate the kinetic energy of a 0.25-kg car traveling at a constant velocity of 2 m/s
Hello!
Calculate the kinetic energy of a 0.25 kg car traveling at a constant velocity of 2 m/s
We have the following data:
m (mass) = 0.25 kg
v (velocity) = 2 m/s
KE (kinetic Energy) = ? (in Joule)
Formula to calculate kinetic energy:
[tex]\boxed{KE = \dfrac{1}{2} *m*v^2}[/tex]
Solving:
[tex]KE = \dfrac{1}{2} *m*v^2[/tex]
[tex]KE = \dfrac{1}{2} *0.25*2^2[/tex]
[tex]KE = \dfrac{1}{2} *0.25*4[/tex]
[tex]KE = \dfrac{1}{2}*1[/tex]
[tex]KE = \dfrac{1}{2}[/tex]
[tex]\boxed{\boxed{KE = 0.5\:Joule}}\Longleftarrow(kinetic\:energy)\:\:\:\:\:\:\bf\blue{\checkmark}[/tex]
_______________________
[tex]\bf\green{I\:Hope\:this\:helps,\:greetings ...\:Dexteright02!}\:\:\ddot{\smile}[/tex]
On the present Periodic table of the elements, the elements are arranged according to increasing what?
Elements on the Periodic Table are organized according to an increasing atomic number. Each element's box contains its atomic number, symbol, and average atomic mass. They're arranged in rows and columns to reflect shared properties.
Explanation:On the current Periodic Table of elements, elements are aligned according to an increasing attribute known as the atomic number. The atomic number signifies the number of protons in the nucleus of an atom. Each box in the table represents an element and consists of the atomic number, symbol, average atomic mass, and sometimes the name of the element. The elements on the table are arranged in seven horizontal rows, referred to as periods or series, and 18 vertical columns, often labeled as groups. Groups from 1 to 18 are assembled based on shared properties, which allows scientists to anticipate behaviors of elements.
https://brainly.com/question/31672126
#SPJ12
The Periodic table of the elements is arranged according to increasing atomic number. This system organizes the elements into groups of similar properties, making the table a vital tool for predicting the characteristics of individual elements.
Explanation:The Periodic table of the elements is a tool where the elements are arranged according to an increasing order of their atomic numbers which corresponds with the number of protons in each nucleus. Atomic number plays a major role in the table's structure, organizing the elements into seven horizontal rows or periods, and 18 vertical columns or groups. Atoms with similar properties are grouped together in the same vertical column. This arrangement allows for the prediction of an element's properties based on its location within the table.
Learn more about Periodic table here:https://brainly.com/question/31672126
#SPJ12
How many grams of chloride ions are in 8.3 g of copper (II) chloride
[tex]4.4\; {\rm g}[/tex].
ExplanationRefer to a modern periodic table for relative atomic mass:
Cu- 63.546;Cl- 35.45.Formula of copper (II) chloride: CuCl₂.
Formula mass of copper (II) chloride:
63.546 + 2 × 35.45 = [tex]134.446\; {\rm g \cdot mol^{-1}}[/tex].
How many [tex]{\rm mol}[/tex] of formula units in 8.3 grams of CuCl₂?
[tex](8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^{-1}}) \approx 0.0617\; {\rm mol}[/tex]
Note the subscript "2" in the formula CuCl₂. There are [tex]2\; {\rm mol}[/tex] of chloride ions in every [tex]1\; {\rm mol}[/tex] formula unit of CuCl₂.
There would be [tex]2 \times 0.0617\; {\rm mol} \approx 0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions in [tex]0.0617\; {\rm mol}[/tex] formula units of CuCl₂.
The mass of [tex]1\; {\rm mol}[/tex] of chloride ion is 35.45 grams.
The mass of [tex]0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions will be [tex]35.45 \times 0.123 \approx 4.4\; {\rm g}[/tex].
Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.