How many molecules are present in 385.55g of NO2?

Answer:

32 mols of water

Explanation:

2H2 + O2 ==> 2H2O

What your givens are telling you and what the equation is saying is that

for every mol of O2, you get 2 mols of H2O

So you could do it with the proportion about.

1/16 = 2/x                 Cross multiply

x = 16 * 2

x = 32

Answer:

32 mol

Explanation:

The balanced reaction from Oxygen and Hydrogen to form Water is:

(1/2)O₂ + H₂ ⇒ H₂O

So, 1/2 mol of oxygen forms 1 mol of water. The stoichiometry calculus must be:

1/2 mol of O₂ -------------------------- 1 mol of H₂O

16 mol of O₂ --------------------------- x mol of H₂O

By a direct simple three rule:

(1/2)x = 16

x = 32 mol

This is false! Einstein’s equation implies that a small amount of mass can be converted into a huge amount of energy. For example, my mass (~125 kg) if converted to energy would release approximately 11.2 exajoules (1.12 x 10^19 J), or enough energy to power the whole United States for about 45 days.

Hope this helps!

Energy is released when this happens

I believe it is Energy, I am not sure. Sorry if it is wrong.

Ans: 187.5 grams of Al2O3

Final answer:

To calculate the mass of [tex]Al_2O_3[/tex] produced from 375 grams of Al, we find the moles of Al, use the stoichiometry of the reaction to find the moles of [tex]Al_2O_3[/tex], and then convert to grams. The result is 708.6 grams of [tex]Al_2O_3[/tex].

Explanation:

Given the balanced chemical reaction [tex]4Al + 3O_2 \rightarrow 2Al_2O_3[/tex], we first need to calculate the number of moles of aluminum (Al) that's present in 375 grams. Using the molar mass of aluminum (26.98 g/mol), we can determine this:

Hence, if 375 grams of Al react completely, a total of 708.6 grams of [tex]Al_2O_3[/tex] will be produced.

Answer: compound, chemical

Explanation:

Answer:

B. Nonpolar covalent bond

Explanation:

Between two Nitrogen atoms, a non-polar covalent bond would be formed.

So, what is the nature of a covalent bond, and what makes a covalent bond non-polar?

A covalent bond is a type of bond that forms between two atoms that shares their valence electrons. The valence electrons are donated by the two atoms and they are shared in order to achieve an octet. This bond type is predominantly between atoms that have an electronegativity difference less than 0.5. Using the electronegativity values, we see that a difference of 0 would be obtained.

Due to equal affinities of the two atoms for the valence electrons, none of them will pull the electrons closer to themselves. There won't be any form of charge separation on the two atoms and a Nitrogen molecule will form. This makes the bond type a non-polar covalent type.

Answer:

B. Nonpolar covalent bond

Explanation:

Between two Nitrogen atoms, a non-polar covalent bond would be formed.

So, what is the nature of a covalent bond, and what makes a covalent bond non-polar?

A covalent bond is a type of bond that forms between two atoms that shares their valence electrons. The valence electrons are donated by the two atoms and they are shared in order to achieve an octet. This bond type is predominantly between atoms that have an electronegativity difference less than 0.5. Using the electronegativity values, we see that a difference of 0 would be obtained.

Due to equal affinities of the two atoms for the valence electrons, none of them will pull the electrons closer to themselves. There won't be any form of charge separation on the two atoms and a Nitrogen molecule will form. This makes the bond type a non-polar covalent type.

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When red light is added to green light you get yellow

Pluto was ruled not a planet anymore because it is a "dwarf  planet"

Apparently, the International Astronomical Union's (IAU) definition of a planet includes that a planet should be part of a body that would orbit the sun.  

According to the IAU, there are three criteria's that contribute to a planet being called a planet.

1. It is within orbit around the Sun.

2. It has a sufficient mass to assume a nearly round shape

and 3. It has "cleared the neighborhood" around it's orbit.

Pluto only so happens to meet 2 of these requirements, not including the third option.

Answer:

In august 2006 the international astronomical union (IAU) downgraded the status of Pluto to that of "Dwarf planet." this means that from now on only the rocky worlds of the inner solar system and the gas giants of the outer system will be designated.

("Hope this is helpful.")

Answer:

from 2-pentanone  chloropentane  pentene  and pentane, the correct one is 2-pentanone .

The molarity of both solutions is the same, equaling to approximately 1.0 M (mol/L), because molarity is determined by the number of moles of solute per liter of solution, not just the solvent.

Yes, the molarity of both solutions would indeed be the same. Molarity is defined as the number of moles of solute per liter of solution. In your first solution, you dissolved 1.0 moles of NaCl in a total of 1.0 liter of solution. In your second situation, you added 1.0 moles of NaCl to 1.0 liters of water, assuming it does not change the volume substantially, the total volume of the solution is also about 1.0 liters. Thus, the molarity, in both cases, would be approximately 1.0 M (mol/L). It's important to remember that molarity takes into consideration the entire volume of the solution, not just the solvent.

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While both solutions have the same amount of sodium chloride, the process of preparation leads to different volumes of the final solution which influences the molarity. Thus, the molarities of the two solutions are different with the first one being more concentrated.

The molarity of a solution is calculated by dividing the number of moles of solute by the volume of the solution in liters.

In the first solution, 1.0 mole of sodium chloride (NaCl) is dissolved to make 1.0 liters of solution, hence its molarity is 1.0 moles/liter.

In the second solution, 1.0 moles of NaCl is added to 1.0 liters of water; however, when sodium chloride is added, the volume of the solution increases, so the resulting volume of the solution is greater than 1.0 liter which ultimately lessens the molarity of the solution.

Therefore, the molarity of the first solution is greater than the molarity of the second solution despite having the same amount of sodium chloride.

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the niche of an organism is largely based on the evolution of an organism's physiology, behavior, and morphology

Answer:

it explains the relationship between temperature and volume

Charles law states that if given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. this law explains relation between temperature and volume.

Charles' law is just a gas statement that governs how gases increase while heated in an experimental setting. The Kelvin temperature and volume should be in direct proportion whenever the pressure on such a test of dry gas was maintained constant, according to a modern version of Charles's law.

A scalar quantity that expresses the proportion of three-dimensional area contained by a sealed surface will be called volume.

Therefore, Charles law states that if given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. this law explains relation between temperature and volume.

To know more about Charles law.

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Answer:

In order to answer the question, we convert the measurements given to a common base unit. For this case, we use seconds.

A)   0.02 seconds

B)   0.02 teraseconds x (10^12 s / 1 terasecond) = 2x10^10 seconds

C)   2,500 milliseconds x (1 s / 1000 ms) = 2.5 seconds

D)   25,000 nanoseconds x (1 x 10^-9 s / 1 nanosecond) = 2.5 x 10^-5 seconds

So ,The correct answer is option " D "

Answer:

The molecules have shorter inter molecular distances  and less kinetic energy than the original gas sample.

The cooling reduces the kinetic energy of the gas sample and thus the molecules making up the liquid sample travel less distances due to the less energy. The less inter molecular distances increases the attraction due to inter molecular forces packing the molecules near each other, forming a liquid.

2016 the warmest year on record, but eight of the twelve months that make up the year from January through September, with the exception of June were the warmest on record for those respective months. This is evidence showing how the climate has changed

Answer:

Climate change is caused when fuel is burned. This leads to excess carbon dioxide into the air. Scientists know that climate change is happening when:

Hope this helps and have a good day!

Answer:

Explanation:

From Einstein's postulate, mass can be converted to energy using the expression below:

         E = mc²

E is energy, m is the mass and c is the speed of light.

In a nuclear fusion process; 4 hydrogen atoms with a mass of 1.00794 combines to produce an helium atom of mass 4.0026. There is a mass difference between the 4 fusing hydrogen atoms and the resulting Helium atom:

   Mass difference = 4(mass of hydrogen) - mass of helium

   Mass difference = 4(1.00794 ) - 4.0026 = 4.03176 -  4.0026 = 0.02916

It is this difference in mass that is converted to energy that powers the sun.

Final answer:

The slight mass difference between four hydrogen atoms and one helium atom, through the process of nuclear fusion, is converted into a significant amount of energy, powering the sun's radiation and 'shine'.

Explanation:

The difference in the mass of four hydrogen atoms and one helium atom explains the energy released by the sun through the process of nuclear fusion. In nuclear fusion, four hydrogen nuclei (4 H) combine to form one helium nucleus (He), and this process results in a slight loss of mass. This mass is not lost but converted into energy according to Einstein's equation, E=mc2, where E is energy, m is mass, and c is the speed of light. The mass difference, although small (—0.7% less for helium compared to the combined mass of four hydrogen atoms), gets converted into a vast amount of energy. Specifically, this reaction produces about 3.6 × 1011 kJ of energy per mole of He produced. This energy is what causes the sun to 'shine' and radiate energy throughout the solar system.

The mass of [tex]\( \text{Al}_2\text{O}_3 \)[/tex] produced is approximately [tex]\( 709 \text{ g} \).[/tex]

To determine the mass of [tex]\( \text{Al}_2\text{O}_3 \)[/tex] produced when 375 grams of [tex]\( \text{Al} \)[/tex] react completely, follow these steps:

Given Reaction:

[tex]\[ 4 \text{Al} + 3 \text{O}_2 \rightarrow 2 \text{Al}_2\text{O}_3 \][/tex]

Steps:

1. Calculate the molar mass of [tex]\( \text{Al} \) and \( \text{Al}_2\text{O}_3 \):[/tex]

Molar mass of Al aluminum: [tex]\( 26.98 \text{ g/mol} \)[/tex]

Molar mass of [tex]\( \text{Al}_2\text{O}_3 \)[/tex] aluminum oxide:

[tex]\[\text{Molar mass of } \text{Al}_2\text{O}_3 = (2 \times 26.98 \text{ g/mol}) + (3 \times 16.00 \text{ g/mol}) = 53.96 \text{ g/mol} + 48.00 \text{ g/mol} = 101.96 \text{ g/mol}\][/tex]

2. Convert the mass of [tex]\( \text{Al} \)[/tex] to moles:

[tex]\[\text{Moles of Al} = \frac{\text{mass of Al}}{\text{molar mass of Al}} = \frac{375 \text{ g}}{26.98 \text{ g/mol}} \approx 13.91 \text{ mol}\][/tex]

3. Use the stoichiometry of the reaction to find the moles of [tex]\( \text{Al}_2\text{O}_3 \)[/tex] produced:

According to the balanced equation, 4 moles of Al produce 2 moles of[tex]\( \text{Al}_2\text{O}_3 \)[/tex]. So:

[tex]\[\text{Moles of } \text{Al}_2\text{O}_3 = \left(\frac{2 \text{ moles } \text{Al}_2\text{O}_3}{4 \text{ moles Al}}\right) \times 13.91 \text{ mol} = 6.95 \text{ mol}\][/tex]

4. Convert the moles of [tex]\( \text{Al}_2\text{O}_3 \)[/tex] to grams:

[tex]\[\text{Mass of } \text{Al}_2\text{O}_3 = \text{moles of } \text{Al}_2\text{O}_3 \times \text{molar mass of } \text{Al}_2\text{O}_3\][/tex]

[tex]\[\text{Mass of } \text{Al}_2\text{O}_3 = 6.95 \text{ mol} \times 101.96 \text{ g/mol} \approx 708.7 \text{ g}\][/tex]

A balanced chemical equation is analogous to a recipe because it outlines precise quantities of reactants needed to produce specific products, reflecting the concept of stoichiometry used in cooking. Adjusting ingredient amounts when changing recipe size is similar to calculating reactant and product amounts in chemical reactions, demonstrating the conservation of mass.

A balanced chemical equation is similar to a recipe in that both provide the exact proportions of ingredients or reactants needed to produce a desired outcome, be it a chemical product or a food dish. When you follow a recipe, you are essentially performing stoichiometry, which is the precise measurement and calculation of reactants and products in a chemical reaction. Just as doubling or halving a recipe requires adjusting the amount of each ingredient accordingly, the same concept applies to chemical reactions when predicting the amounts of products produced or reactants required.

For instance, just like a recipe that makes 1 dozen biscuits requires specific quantities of flour, eggs, shortening, salt, baking soda, and milk, a chemical equation needs to balance the atoms of each element on both the reactant and product sides of the equation. This reflects the conservation of mass, as the quantity of each element remains constant throughout the reaction. The balanced equation thus communicates not only the substances involved but also their amounts in a concise and quantitative manner. By understanding the concepts used in cooking, one can grasp the principles of stoichiometry and balanced equations in chemistry.

N(number of moles)=mass/molar mass

10.5=mass

Na=23 (rounded)

Cl=36 (rounded)

Add it together to get the molar mass

=59

Then refer back to the formula

10.5/59

=0.17796

Round that answer

=0.18 mol

Answer : The correct option is, 0.180 mole

Explanation : Given,

Mass of NaCl = 10.5 g

Molar mass of NaCl = 58.5 g/mole

Formula used :

[tex]\text{Moles of NaCl}=\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}}[/tex]

Now put all the given values in this formula, we get the moles of NaCl.

[tex]\text{Moles of NaCl}=\frac{10.5g}{58.5g/mole}[/tex]

[tex]\text{Moles of NaCl}=0.179mole=0.180mole[/tex]

Therefore, the number of moles of NaCl is, 0.180 mole

Answer:

The particles that have approximately the same size and mass is Proton and Neutron.

Explanation:

Answer:

A. 1

Explanation:

The higher you get in the atmosphere the cooler the temperature will be. The reason it's actually colder is because, as you go up in the atmosphere, the Earth's atmosphere feels less pressure the higher up you go. So as the gas in the atmosphere rises it feels less pressure, which makes it expand.

Hope this Help :)

Please mark brainliest :D

Answer:

The first one is right :)

Explanation:

I got it right on Plato.

Answer:

[tex]\boxed{\text{A) filter}}[/tex]

Explanation:

An automobile air filter is often made of porous pleated paper. Many of them are cylindrical, as in the diagram below, but others have shapes that fit the available space in the engine compartment.

B) is wrong. A radiator is used to cool the car's engine.

C) and D) are wrong. You probably won't find a distillation apparatus or chromatography paper in your mother's car unless she is a chemist taking them somewhere else.

It would be letter A

Answer:

Explanation:

In a simple pendulum with no friction, mechanical energy is conserved.  Total mechanical energy is a combination of kinetic energy and gravitational potential energy.   As the pendulum swings back and forth, there is a constant exchange between kinetic energy and gravitational potential energy

Answer:

0.048M

Explanation:

Volume of acid = 25mL = 0.025L

Concentration of base NaOH = 0.12M

Volume of base NaOH = 10mL= 0.01L

Unknown:

concentration or molarity of the nitric acid = ?

Solution

We first write the balanced reaction equation:

           HNO₃ + NaOH → NaNO₃ + H₂O

In this problem, the focus is on the reacting acid and base which are on the left hand side.

Now, to find the molarity of the nitric acid that would be completely neutralized by the base, we adopt the mole concept.

First, we work from the known to the unknow. We can find the number of moles of the base given because its parameters are complete. The number of moles is given by the expression below:

        Number of moles = concentration x volume

To find the number of moles of the base, we put the parameters into the expression above:

Number of moles of NaOH = concentration of NaOH x volume of NaOH

                                              = 0.01 x0.12

                                              = 0.0012mol

From the number of moles of the base, we can find the unknown.

  In the reaction equation:

      1 mole of base neutralizes 1 mole of the acid

      0.0012mole of the base will neutralize 0.0012mole of the acid

Therefore, 0.0012mole of HNO₃ was neutralized.

Now we can calculate the molarity of the acid using the expression below:

     concentration of acid = [tex]\frac{ number of moles of acid}{volume of acid}[/tex]

     concentration of acid = [tex]\frac{0.0012 }{0.025}[/tex] = 0.048M

The molarity of nitric acid (HNO3) used in the titration with 0.12 M NaOH is 0.048 M, calculated using the moles of NaOH needed to neutralize the acid and the volume of HNO3.

Given that the NaOH base has a concentration of 0.12 M and a volume of 10.0 mL was used to neutralize the acid, we first convert the volume of NaOH to liters (10.0 mL = 0.010 L) to calculate the moles of NaOH:

Moles of NaOH = Molarity × Volume (in liters) = 0.12 M × 0.010 L = 0.0012 mol

Since the reaction between HNO3 and NaOH is 1:1, the moles of HNO3 are equal to the moles of NaOH. Using the volume of HNO3 (25.0 mL = 0.025 L), we can calculate its molarity:

Molarity of HNO3 = Moles of HNO3 / Volume of HNO3 in liters = 0.0012 mol / 0.025 L = 0.048 M

Answer:

the answer would be C:  point source

Explanation:

because it specified the source of the pollution (manufacturing plant)

Answer:B.)

Explanation:

what the other person said

Answer:

Chernobyl Accident 1986. The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the atmosphere and downwind – some 5200 PBq (I-131 eq).

Explanation:

The Chernobyl disaster was a catastrophic nuclear accident in 1986, causing immediate deaths and long-term health issues due to radiation. The region remains largely uninhabitable due to persistent contamination.

Significance of the Chernobyl Meltdown:

The Chernobyl disaster, which occurred on April 26, 1986, was a catastrophic nuclear accident at the Chernobyl Nuclear Power Plant in Ukraine. During an unauthorized safety test, reactor no. 4 exploded due to an uncontrollable chain reaction, causing immense steam pressure that ruptured the reactor and released radioactive material.

The aftermath saw 50 tonnes of radioactive material released into the environment, leading to the evacuation of approximately 30,000 people.

Immediate effects included the deaths of 32 plant workers and firefighters who succumbed to acute radiation sickness. Long-term consequences predict around 4000 additional deaths from radiation-induced illnesses like cancer among emergency workers and former residents.

The region around Chernobyl remains highly contaminated and largely uninhabitable, demonstrating the devastating and lasting impact of nuclear accidents on both human populations and the environment.

The Chernobyl disaster has highlighted the risks associated with nuclear energy, influenced global nuclear policy and safety standards, and left a stark reminder of the potential outcomes of nuclear energy mismanagement.

Answer:

The reaction will continue in the forward direction until all the NO or all the NO₂ is used up.

Explanation:

Answer:

3.07 × 10^4=30,700

3.07 × 10^-4=0.000307

3.07 × 10^-6=0.00000307

3.07 × 10^6=3,070,000

Explanation:

Answer:

Explanation:

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

For example : 6,000,000 is written as [tex]6.0\times 10^6[/tex]