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topjm [15]
3 years ago
9

The pressure of an enclosed gas depends on:

Chemistry
2 answers:
Elden [556K]3 years ago
5 0
I think the correct answer from the choices listed above is the last option. The pressure of an enclosed gas depends on the number of molecules in a unit volume and their average kinetic energy, its chemical composition, the altitude about sea level and the number of atoms per molecule. Hope this helps. Have a nice day.
Nady [450]3 years ago
5 0

Answer: The pressure of an enclosed gas will depend on the number of molecules in a unit volume and and their average kinetic energy.

Explanation: The pressure of the gas is inversely related to volume given by Boyle's Law.

P\propto \frac{1}{V}

And pressure is directly related to the temperature of the gas given by Gay-Lussac's Law

P\propto T

Relation between average kinetic energy and temperature is:

K.E.=\frac{3RT}{2N_A}

From this relation, we can say that pressure is related to the average kinetic energy.

From the above relations, we can say that the pressure depends on the number of molecules in a unit volume and and their average kinetic energy.

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Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. Write a balanced chemical equation for t
Alona [7]

Answer:

The balanced chemical equation is Mg + 2HCl ⇒ MgCl2 + H2

The molarity of the hydrochloric acid solution is HCl 0.04 M and the pH = 1.4.

The volume of hydrogen gas produced by the reaction of 0.510 g of Mg will be 0.482 L.

Explanation:

First, for the balanced equation you have to consider the oxidation state of the elements to find subscripts. Then you can find the correct coeficients. Mg= +2, Cl = -1.

Mg + HCL ⇒ MgCl2 + H2

For the molarity of the solution you have to notice tha if 0.510 grams of Mg reacts with 0,5 L of hydroclhoric acid, and from the previous equation 1 mol of Mg reacts with 2 mol HCl.

The atomic mass of Mg = 24.31 grs/mol

24.31 grs------------ 1 mol Mg

0.510 grs------------ x=0.02 mol Mg.

If 1 mol of Mg reacts with 2 mol HCl, then 0.02 mol of Mg will react with

0.04 mol HCl. So, the molarity of the solution is 0.04 M HCl.

Then to calculate the pH we use the formula pH = - log [H+]

⇒ pH = -log [0.04]⇒ pH=1.4.

Finally, from the balanced equation and the findings described, and considering that at 25°C and 1.00 atm 1 mol of gas has volume of 24.1 L.

1 mol H2----------- 24.1 L

0.02 mol H2----- x= 0.482L.

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3 years ago
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