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Constant-Pressure Conditions of Hydrogen Gas

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I'm reviewing for my Chem final and need stuff explained. Please give very in-depth explanations and answers so I can understand how to do it.

At 46 degrees C a sample of ammonia gas exerts a pressure of 5.3 atm. What is the pressure when the volume of the gas is reduced to on tenth (0.10) of the original value at the same temperature?

A sample of air occupies 3.8 L when the pressure is 1.2 atm.
a) What volume does it occupy at 6.6 atm?
b) What pressure is required in order to compress it to 0.075 L? (The temperature is kept constant)

Under constant-pressure conditions a sample of hydrogen gas initially at 88 degrees C and 9.6 L is cooled until its final volume is 3.4 L. What is its final temperature?

Given that 6.9 moles of carbon monoxide gas are present in a container of volume 30.4 L, what is the pressure of the gas (in atm) if the temperature is 62 degrees C?

The temperature of 2.5 L of a gas initially at STP is increased to 250 degrees C at constant volume. Calculate the final pressure of the gas in atm.

The volume of a gas at STP is 488 ml. Calculate its volume at 22.5 atm and 150 degrees C.

Assuming that air contains 78% N2, 21% O2, and 1% Ar, all by volume, how many molecules of each type of gas are present in 1.0L of air at STP?

A compound has the empirical formula of SF4. At 20 degreesC, 0.100g of the gaseous compound occupies a volume of 22.1ml and exerts a pressure of 1.02 atm. What is its molecular formula?

A 2.5L flask at 15 degreesC contains a mixture of three gases, N2, He, and Ne, at partial pressures of N2-0.32 atm, He-0.15 atm, Ne-0.42 atm.
a) Calculate the total pressure of the mixture.
b) Calculate the volume in liters at STP occupied by He and Ne if the N2 is removed selectively.

A mixture of helium and neon gases is collected over water at 28.0 degreesC and 745 mmHg. If the partial pressure of helium is 368 mmHg, what is the partial pressure of neon? (Vapor pressure of water at 28.0 degreesC=28.3 mmHg.)

Some commercial drain cleaners contain two components: sodium hydroxide and aluminum powder. When the mixture is poured down a clogged drain, the following reaction occurs;
2NaOH(aq)+2Al(s)+6H2O(l)------>2NaAl(OH)4(aq)=3H2(g)
The heat generated in this reaction helps melt away obstructions such as grease, and the hydrogen gas stirs up the solids clogging the drain. Calculate the volume ofH2 formed at STP if 3.12g of Al is treated with an excess of NaOH.

Propane (C3H8) burns in oxygen to produce carbon gas and water vapor.
a) Write a balanced equation for this reaction.
b) Calculate the number of liters of carbon dioxide measured at STP that could be produced from 7.45g of propane.

A 6.11g sample of a Cu-Zn alloy reacts with HCl acid to produce hydrogen gas. If the hydrogen gas has a volume of 1.26L at 22 degreesC and 728 mmHg, what is the percent of Zn in the alloy? (Hint; Cu does not react with HCl)

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Solution Summary

Constant pressure conditions of hydrogen gas is examined.

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