Which of these solutions has the lowest freezing point?
0.25 M NaCl
0.5 M NaCl
1.0 M NaCl
1.5 M NaCl
2.0 M NaCl

Answers

Answer 1

Answer is: 2.0 M NaCl.

Change in freezing point from pure solvent (water) to solution (sodium chloride solution): ΔT = i · Kf · c.

Kf - molal freezing-point depression constant for water is 1.86°C/m.

c-  molarity of the solution.

i - Van't Hoff factor.  

Because molal freezing-point depression constant and Van't Hoff factor are the same for all five solutions, freezing point depends on molarity of the solution.

The higher is the molarity, the lower is freezing point.

The temperature at which the phase transition solid-liquid occurs is the melting point or the freezing point.

Answer 2

Answer : The correct option is, 2.0 M NaCl

Explanation :

Formula used for lowering in freezing point :

[tex]\Delta T_f=i\times k_f\times m[/tex]

where,

[tex]\DeltaT_f[/tex] = change in freezing point  or freezing point depression

[tex]k_f[/tex] = freezing point constant

m = molality

i = Van't Hoff factor

As we know that the Van't Hoff factor for NaCl will be same for all given concentrations of NaCl and [tex]k_f[/tex] is the constant term. So, freezing point depression directly depends only on the molality of the solution.

That means the more the value of molality, the lower will be the freezing point and vice-versa.

From the given options, 2.0 M NaCl has the lowest freezing point.

Hence, the correct option is, 2.0 M NaCl


Related Questions

In the reaction Mg(s) + 2H2O(l) Mg(OH)2(s) + H2(g), what is the oxidation state of each H in H2(g)?


A. 0
B. +2 and –2
C. +1
D. –1 and +1

Answers

The rule to apply is that any element which is not combined with other element its oxidation state is 0.

So, given that in H2, each H atom is bonded only to other H atom, its oxidation state is 0.

The same is also true for O2, N2, S2, F2, Cl2, their oxidation states are 0.

Also for pure elements like Na, Li, Fe, K, Mg, Ca, in any case that the element is pure the oxidation state is 0.

Answer: option A. 0.

Answer:0

Explanation:

Wine goes bad soon after opening because the ethanol ch3ch2oh in it reacts with oxygen gas o2 from the air to form water h2o and acetic acid ch3cooh , the main ingredient of vinegar. what mass of ethanol is consumed by the reaction of 3.84g of oxygen gas? be sure your answer has the correct number of significant digits.

Answers

The balanced chemical equation of the reaction described above is,

                            C2H6O + O2 --> H2O  + C2H4O2

If we have 3.84 g of oxygen, we divide by its molar mass.
 
                               n = (3.54 g Oxygen gas) x (1 mole O2/ 32 g O2)
                                 n = 0.11 moles O2

Using ratio and proportion,

               number of moles of ethanol = (0.11 moles O2) x (1 mole C2H6)
                                                  = 0.11 moles C2H6

Then, we multiply the calculated value to its molar mass, 46 grams /mol.
                    mass of ethanol = (0.11 mol) x (46 grams / mol)
                                                = 5.06 grams

The solubility product for barium sulfate is 1.1 × 10–10. calculate the molar solubility of barium sulfate.

Answers

the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.

The correct option is (b).

The solubility product (Ksp) for Barium Sulfate (BaSO₄) is given as 1.1 × 10⁻¹⁰. The solubility product is the equilibrium constant representing the relationship between the concentrations of the ions in the saturated solution:

BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄²⁻(aq)

To calculate the molar solubility (S) for BaSO₄, we need to find the concentration of Ba²⁺ and SO₄²⁻ ions at equilibrium. Since Ksp is given, we can use the definition of the solubility product:

Ksp = [Ba²⁺] × [SO₄²⁻]²

We don't have the individual ion concentrations but can find the total molar solubility (Sₙ) by taking the square root of the solubility product:

Sₙ = √(Ksp) = √(1.1 × 10⁻¹⁰) = 1.05 × 10⁻⁵ mol/L

So, the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.

complete question given below:

The solubility product for barium sulfate is 1.1*10⁻¹⁰. Calculate the molar solubility of barium sulfate.

1) 5.5*10⁻⁸ mol/L

2) 1.05 *10⁻⁵ mol/L

3) 2.1*10⁻⁵ mol/L

4) 1.1*10⁻¹⁰ mol/L

5) 2.2*10⁻¹⁰ mol/L

What is the mass of 4.91 x10^21 platinum atoms?

Answers

To calculate the mass, go from atoms to moles and moles to grams:

Atoms ........ Moles.......... Grams

From atoms to moles, use the Avogadro’s no. which is 6.022 x 10^23 and from moles to grams use atomic mass of Pt that is 195.08g.

So, 4.91 x 10^21 Pt atoms x (1 mole Pt / 6.022x10^23 Pt atoms) x (195.08g Pt / 1 mole Pt) = 1.59g Pt

Mass of 4.91 x 10^21 Pt atoms = 1.59g Pt

The mass of [tex]4.91 \times {10^{21}}{\text{ platinum atoms}}[/tex] is [tex]\boxed{1.59{\text{ g}}}[/tex].

Further Explanation:

We are provided with atoms of platinum and its mass is to be calculated. For this, first of all atoms of Pt are to be converted into moles. This is done with the help of Avogadro’s law. According to Avogadro’s law, one mole of any substance contains [tex]6.022 \times {10^{23}}{\text{ units}}[/tex]. Such units can be atoms and molecules.

Since [tex]6.022 \times {10^{23}}[/tex] of platinum consist of one mole, number of moles that are present in [tex]4.91 \times {10^{21}}{\text{ atoms}}[/tex] can be calculated as follows:

 [tex]\begin{aligned}{\text{Moles of Pt}} &= \left( {4.91 \times {{10}^{21}}{\text{ atoms}}} \right)\left( {\frac{{1{\text{ mol}}}}{{6.022 \times {{10}^{23}}{\text{ atoms}}}}} \right) \\&= 0.008153{\text{ mol}} \\\end{aligned}[/tex]

Now moles calculated in above step are used to proceed for further calculations of mass. Moles and mass of Pt are related to each other with the help of expression written below.

The formula to calculate moles of Pt is as follows:

[tex]{\text{Moles of Pt}} = \dfrac{{{\text{Mass of Pt}}}}{{{\text{Molar mass of Pt}}}}[/tex]                                                                    ……(1)

Rearrange equation (1) to calculate mass of Pt.

[tex]{\text{Mass of Pt}} = \left( {{\text{Moles of Pt}}} \right)\left( {{\text{Molar mass of Pt}}} \right)[/tex]                                            …… (2)

The moles of Pt are0.008153 mol.

The molar mass of Pt is 195.084 g/mol.

Substitute these values in equation (2).

[tex]\begin{aligned}{\text{Mass of Pt}} &= \left( {{\text{0}}{\text{.008153 mol}}} \right)\left( {{\text{195}}{\text{.084 g/mol}}} \right)\\&= 1.59{\text{ g}} \\\end{aligned}[/tex]  

Hence,mass of platinum comes out to be 1.59 g.

Learn more:

Law of conservation of matter states: https://brainly.com/question/2190120 Calculation of volume of gas: https://brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Mole concept

Keywords: mole, atoms, Pt, platinum, moles of Pt, molar mass of Pt, 1.59 g, Avogadro’s law, 6.022*10^23 atoms, 4.91*10^21 atoms, mass of Pt, 195.084 g/mol, 0.008153 mol, mass of platinum.

Which is the correct standard notation for 9.3 × 10^5?

a.9,300
b.93,000
c.930,000
d.9,300,000

(yes this is chemistry related)

Answers

ITS C BTWWWWW

HOPE THIS HELPS

Answer : The correct answer is, (C) 930000

Explanation :

Scientific notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.

For example :

5000 is written as [tex]5.0\times 10^3[/tex]

889.9 is written as [tex]8.899\times 10^{-2}[/tex]

In this examples, 5000 and 889.9 are written in the standard notation and [tex]5.0\times 10^3[/tex]  and [tex]8.899\times 10^{-2}[/tex]  are written in the scientific notation.

[tex]8.89\times 10^{-2}[/tex]  this is written in the scientific notation and the standard notation of this number will be, 0.00889.

If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.

As we are given the [tex]9.3\times 10^5[/tex] in scientific notation.

Now converting this into standard notation, we get:

[tex]\Rightarrow 9.3\times 10^5=930000[/tex]

Hence, the correct answer is, (C) 930000

According to the Kinetic Molecular Theory, as the volume of an enclosed gas increases:
the number of particle impacts per unit area increases
the temperature must change
the total number of particle impacts increase
the number of particle impacts per unit area decreases

Answers

Final answer:

The Kinetic Molecular Theory suggests that as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases since the gas particles are more spread out.

Explanation:

According to the Kinetic Molecular Theory, as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases. The Kinetic Molecular Theory, a fundamental concept in gas physics, postulates that gas particles are in constant, random motion and that they frequently collide with each other and the walls of their container. When the volume of the container increases, the gas particles have more space to move around, the number of possible collision points increase but relatively the collisions with specific unit area decreases as the particles are more spread out. So the number of particle impacts per unit area decreases, not increases. The total number of particle impacts or the temperature does not necessarily have to change.

Learn more about Kinetic Molecular Theory here:

https://brainly.com/question/15013597

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A solution is prepared by dissolving 16.2 g of benzene (c6h6) in 282 g of carbon tetrachloride (ccl4). the concentration of benzene in this solution is ________ molal. the molar masses of c6h6 and ccl4 are 78.1 g/mol and 154 g/mol, respectively.

Answers

Molality is one way of expressing concentration of a substance in a solution. It is moles of the substance per kilogram of the solvent in the solution. So, in order, to determine the molality of the solute benzene in the solution given above, we need to know the moles of benzene and the kilograms of the solvent carbon tetrachloride. We calculate as follows:

Molality = moles benzene / mass of carbon tetrachloride
Molality = 16.2 g benzene ( 1 mol / 78.1 g ) / 282 g CCl4 ( 1 kg / 1000 g)
Molality = 0.7356 mol C6H6 / kg CCl4 or 0.7356 molal

Therefore, the concentration of benzene in this solution is 0.7356 molal.

Answer:

43.7%

Explanation:

Which structure shows the correct electron arrangement in CCl4?

Answers

Answer : The figure is attached in the attachment.

Explanation : The central atom will be carbon to which at 109.8 degrees will be each chlorine atoms. And the central carbon atom is [tex] SP^{3}[/tex] hybridized. There will be four chlorine atom surrounding the central carbon atom. There will be 3 lone pairs of electron on each of the chlorine atom which gets attached with carbon atom.

The Lewis structure shows the electrons in a molecule.

The Lewis structure of a molecule shows the number of electrons in the molecule. The unshared electrons are shown as dots while the shared electrons may be showed as a single dash.

The correct Lewis structure of CCl4 is shown in the image attached to this answer.

Learn more about Lewis structure: https://brainly.com/question/4144781

How many carbon atoms are found in a molecule of 2-methyl-3-nonene? 8 9 10 11

Answers

10 or c is the answer.
10 is the correct answer, i just took the test

In a voltaic cell, where does the reduction take place?

Answers

Cathode is the correct answer #plato

Answer : The reduction reaction takes place at cathode.

Explanation :

Voltaic cell : It is defined as a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.

In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.

For example : The redox reaction occurs between the zinc and copper sulfate.

The balanced two-half reactions will be,

Oxidation half reaction (cathode) : [tex]Zn(s)\rightarrow Zn^{2+}(aq)+2e^-[/tex]

Reduction half reaction (anode) : [tex]Cu^{2+}(aq)+2e^-\rightarrow Cu(s)[/tex]

Thus the overall reaction will be,

[tex]Zn(s)+Cu^{2+}(aq)\rightarrow Zn^{2+}(aq)+Cu(s)[/tex]

Hence, the reduction reaction takes place at cathode.

Name a common greenhouse gas containing only hydrogen and oxygen

Answers

The common greenhouse gas containing only hydrogen and oxygen is H2O, this is water vapor.

The common greenhouse gases are water vapor, carbon dioxide, methane, nitrous oxide and ozone.

The composition (chemical formula) of those gases are:

Water vapor: H2O
Carbon dioxide: CO2
Methane: CH4
Nitrous oxide: NO
Ozone: O3.

As you see the only one of those that contains only hydrogen and oxygen is H2O, water vapor.

Calculate the molarity of a solution containing 0.2 mol nh4br in exactly 200 ml solution

Answers

Molarity is calculated using the following equation:
number of moles solute/ number of litres of solvent.
Number of moles = 0.2 moles (given)
1 litre = 1000 ml
Therefore, 200 ml = 0.2 litres
Using the previously mentioned equation, we can calculate molarity as follows:
Molarity = 0.2/0.2 = 1

When a pair of electrons is shared equally between two atoms, the bond formed is called a(n):?

Answers

Answer: When a pair of electrons is shared equally between two atoms, the bond formed is called a: pure covalent bond.

I have used the word pure to enphatize that the pair of electrons is shared equally. Some, bonds share the electrons unequally, yet they are covalent but they are polar. When the pair is shared equally the bond is purely covalent.

Also, you must know that covalent bonds may be single (one pair of electrons is shared), double (two pair of electrons are shared) or triple (three pair of electrons are shared).

The two naturally occurring isotopes of copper are copper-63 and copper-65. how many neutrons are in one atom of copper-65? 29 34 36 65

Answers

It's 36. Since copper has 29 protons you do 65-29=36

Answer: The number of neutrons in copper-65 are 36.

Explanation:

Atomic number is defined as the number of protons that are present in an atom. It is represented as 'Z'

Z = Atomic number = Number of protons

Atomic mass of an element is defined as the sum of number of neutrons and number of protons that are present in an atom. It is represented as 'A'.

A = Atomic mass = Number of neutrons + Number of protons

For Copper, the atomic number is 29.

We are given:

Atomic mass of copper-65 = 65

Number of neutrons = 65 - 29 = 36

Hence, the number of neutrons in the given isotope of copper are 36.

Can someone help mee, pls show the works.. Thx

Answers

97 g of c3h8 is equal to 2.2 moles 
so we will use ratio method according to which for 97 g of c3h8 6.6 moles of co2 is produced
 ANSWER IS 6.6 MOLES OF CO2 IS PRODUCED
     

Answer:

6.6 moles of CO2 is produced

Explanation:

97 g of C3H8 is equal to 2.2 moles, so we'll use ratio method according to which for 97 g of C3H8 6.6 moles of CO2 is produced

It would be expected that methanol (ch3oh) would be more soluble in water than methane (ch4) would be.

a. True

b. False

Answers

ANSWER IS A true 
because both ch3oh and water has hydrogen bonding

Methanol is soluble in water because it can form hydrogen bonds with water molecules. Methane is not able to form hydrogen bond in water and it exists in gas phase.

What is methanol?

Methanol is an organic compound classified as an alcohol. Its formula is CH₃OH. Methanol is usually used in beverages as common alcohol and it is toxic and injurious to health.

Methanol is polar in nature and polar compounds easily dissolves in polar solvents such as water. The OH group in methanol bonds with H+ ends in water and this string hydrogen bond make it soluble in water.

Methane on  the other hand is an organic gas, which does not have free H+ OH- groups to form hydrogen bonds with water and likely be insoluble in water.

To find more on methanol, refer here:

https://brainly.com/question/3006705

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Consider the incomplete reaction below.

NaOH + X mc005-1.jpg NaCH3COO + H2O

What is X in this reaction?
NH4OH
H3PO4
H2CO3
CH3COOH

Answers

First, we can see that the output is a salt and water which means that the reactants were an acid and a base. Since the given reactant is a base, thus, NH4OH is excluded as it is also a base.

Now, examining the outputs of the reactions, we will find that they are composed mainly of sodium, hydrogen, oxygen and carbon. This excludes H3PO4 as it contains phosphorus.

The last step is to compare between the number of moles of each element in the output with those in the input. The output has 1 sodium mole, 2 carbon moles, 5 hydrogen moles and 3 oxygen moles.
The given input (NaOH) has 1 sodium, 1 oxygen and 1 hydrogen moles. Therefore, the other input (reactant) should have 2 carbon, 4 hydrogen and 2 oxygen moles.

Based on this, the right solution is CH3COOH.

In the given neutralization reaction, X would be CH₃COOH.

Let's consider the incomplete reaction below.

NaOH + X ⇒ NaCH₃COO + H₂O

This seems to be a neutralization reaction.

What is a neutralization reaction?

It is a reaction between an acid and a base to form salt and water.

We can identify:

Acid: XBase: NaOHSalt: NaCH₃COOWater: H₂O

What is X in this reaction?

NH₄OH. No, because it is not an acid.H₃PO₄. No, because it wouldn't form NaCH₃COO. H₂CO₃. No, because it wouldn't form NaCH₃COO.CH₃COOH. Yes.

In the given neutralization reaction, X would be CH₃COOH.

Learn more about neutralization here: https://brainly.com/question/203541

Brainliest if answered in the next 5m



When the Ka value is very large, the _________ are favored over the _______.

Reactants
Products

Answers

The products are favored over the reactants
Products then Reactants. I hope i helped! :)

Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter. Please, do not answer it fully but please explain it out and help me understand! thank you

Answers

A model of an atom is important in understanding chemistry and in explaining the behavior of matter because it is the components of the atoms that gave rise to the different properties exhibited by the elements especially the electrons. From the model of the atom, we can predict the how would the elements or molecules behave or interact with each other. Also, it is the from the smallest unit of matter that we can actually see what is going on with the substance undergoing a particular process. You would see the arrangement of the subatomic particles and its effect on the overall structure.

a common greenhouse gas containing only hydrogen and oxygen

Answers

A greenhouse gas is one that leads to global warming, by the absorption of infra-red radiation re-emitted by the ground. Common greenhouse gases include carbon dioxide and methane. Surprisingly, water vapour (which contains only oxygen and hydrogen) is also a greenhouse gas and can contribute to global warming. 

What is the first step in the refining of petroleum?

Answers

Distillation is the first step in the refining of petroleum.

Answer:

the first step is distillation

Explanation:

Which of the following best predicts the outcome of a fusion reaction involving isotopes of hydrogen?
Two hydrogen isotopes form bonds with each other, absorbing a large amount of energy.

The nuclei of the hydrogen isotopes join together to form a heavier element, and energy is released.

Isotopes of hydrogen absorb electrons, undergo an increase in energy level, and split into fragments.

The nuclei of the hydrogen isotopes split, resulting in smaller fragments and the release of a large amount of energy.

Answers

The correct answer would be the second option. The outcome of a fusion reaction which involves isotopes of hydrogen would be the nuclei of the hydrogen isotopes join together to form a heavier element, and energy is released. A fusion reaction is a nuclear reaction which involves at least two nuclei or atoms combining forming products that are heavier than the reactants. Along with the formation of a new atomic nuclei, energy is released. Fusion of two isotopes of hydrogen, specifically deuterium and tritium, results to the formation of a neutron and a helium-3 atom atom. This reaction happens in the core of the Sun.

Which term describes the sum of the number of protons and neutrons in an atom?

Answers

Protons+Neutrons = Mass Number

Answer: The term is Mass number.

Explanation:

Atomic number is defined as the number of protons or number of electrons present in an atom. It is represented as Z.

Z = Number of protons = Number of electrons

Mass number is defined as the sum of number of protons and neutrons in an atom. It is represented as A.

A = Number of proton + Number of neutrons

Hence, the correct answer is Mass number.

How many electrons potassium isotope with 19 protons and 22 neutrons?

Answers

An isotope of an element has the same amount of protons and electrons. Only the amount of neutrons differ. In ions the amount of electrons change. Since this is an isotope of potassium, it would still have 19 electrons, same as protons. Hope I helped!

[07.02]what is the concentration of a ca(oh)2 solution if 10.0 ml of 0.600 m h3po4 solution is required to completely neutralize 12.5 ml of the ca(oh)2 solution? 0.320 m 0.480 m 0.720 m 1.44 m

Answers

In neutralization process or titration process, we use the formula;
(M1V1)H3PO4 = M2V2(Ca(OH)2)
M1 = 0.600 m
V1 = 10.0ml
M2 = unknown
V2 = 12.5ml
M1V1 = M2V2
0.6*10 = 12.5*M2
M2 = (0.6*10)/12.5 = 0.48m
Therefore, the answer is 0.480m

When fast moving electrons are released from an atom by way of a beta particle, the atom ends up with...
one less proton and one more neutron.
one more proton and one less neutron.
the same number of protons and two more neutrons.
two more neutrons and the same number of protons.

Answers

The correct option is ONE MORE PROTON AND ONE LESS NEUTRON. In beta decay, a neutron change into a proton and an electron. The proton remains in the nucleus while the electron is given off with high energy, this electron is called beta particle; its emission results in one more proton and one less neutron. This implies that the atomic mass number of the atom is unchanged while the atomic number increases by 1.

Determine the ph of a 0.00598 m hclo4 solution. 1.777 6.434 7.566 2.223 3.558

Answers

The correct pH of a 0.00598 M [tex]HClO_4[/tex] solution is approximately 2.223.

To determine the pH of a 0.00598 M [tex]HClO_4[/tex] solution, we can use the fact that [tex]HClO_4[/tex] is a strong acid and dissociates completely in water. Therefore, the concentration of H+ ions in the solution will be equal to the concentration of the acid.

Given that the concentration of [tex]HClO_4[/tex] is 0.00598 M, the concentration of H+ ions will also be 0.00598 M. The pH of a solution is defined as the negative logarithm (base 10) of the [tex]H^+[/tex] ion concentration:

[tex]\[ \text{pH} = -\log[H^+] \][/tex]

Substituting the concentration of H+ ions into the equation, we get:

[tex]\[ \text{pH} = -\log(0.00598) \][/tex]

Using a calculator to find the logarithm and then the negative of that value, we obtain:

[tex]\[ \text{pH} \approx 2.223 \][/tex]

This is the most accurate value among the given options, and it corresponds to the pH of the solution. The other options (1.777, 6.434, 7.566, and 3.558) do not accurately represent the pH of a 0.00598 M [tex]HClO_4[/tex] solution.

Calcium chloride (cacl2) is an ionic compound that dissociates in water. a chemist forms a solution by mixing 0.50 mol cacl2 and 1.0 kg of water. how many moles of ions are in the solution?

Answers

Calcium chloride (CaCl2) is a salt which dissociates when dissolved in water. Assuming that the dissociation is complete (100 %), then the half reaction for this would be:

CaCl2 ---> Ca2+  +  2 Cl-

We can see that in 1 mole of CaCl2 salt, 1 mole of Ca2+ ion and 2 moles of Cl- ion is created. Therefore there are 3 moles of ion per 1 mole of CaCl2. Using this ratio, the total number of moles of ions in the solution is:

Total number of ions = 0.5 mol CaCl2 * (3 moles ion / 1 mol CaCl2)

Total number of ions = 1.5 moles ion

Answer:

1.5 mol ions

Explanation:

What is the magnitude of the electrostatic force between a singly charged sodium ion and an adjacent singly charged chlorine ion?

Answers

To know the electrostatic force between two charges or between two ions, you can use the Coulomb's Law. The equation is F = k*q1*q1/r^2, where F is the electrostatic force, q1 and q2 are the charger for Na and Cl, and r is the distance between the centers of both atoms. In literature, the distance is 0.5 nm or 0.5 x 10^-9 meters. The charge for Na+ and Cl- is the same magnitude but different in sign. Since Na+ is a cation, its charge is +1.603x10^-19 C (the charge of an electron). For Cl- being an anion, its charge is -1.603x10^-19 C. The constant k is an empirical value equal to 9x10^9. Using the formula:

F = (9x10^9)(+1.603x10^-19)(-1.603x10^-19)/(0.5 x 10^-9)^2
F = -9.25 x 10^-10 Newtons

The negative denotes that the net force is more towards the Cl- ion.

Convert 3.45 kilometers to micrometers.

Answers

3.45= 3,450,000,000 Im working on this at school rn I hope I helped


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