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Misc.
Gas Laws
Gas Calculation
Partial Pressures and Potpurri
Stoichiometry Problems
100
All gas law problems must have this unit for temperature.
What are Kelvins?
100
pressure varies inversely with volume (temp is constant)
What is Boyle's Law
100

A sample of oxygen gas collected in the lab occupies a volume of 250. mL when its pressure is 720. mmHg. What volume will the gas occupy at a pressure of 760. mmHg if the temperature is held constant?

What is 237 mL

100

The conversion factor from moles Liters

1 mole = 22.4 L

100

What is the coefficient in front of a formula in a balanced equation equal to?

moles or liters (amount of a substance and volume)

200
This law is the basis for balancing equations?
What is The Law of Conservation of Mass?
200
Volume varies directly with temperature (constant pressure)
What is Charles' Law
200
A sample of neon gas occupies a volume of 742 mL at 35˚C. What volume will the gas occupy at 60˚C if the pressure is held constant?
What is 802 mL
200

What are 2 possible units for pressure?

kilopascals, torr, mmHg, atm

200

What is the mole/volume ratio between HNO3 and NO2? 3NO2 + H2O ---> NO + 2HNO3

2:3

300
Two sealed beakers. one smaller than the other, are filled with the same amount of air. This one has the higher pressure.
What is the smaller beaker?
300
pressure varies directly with temperature (constant volume)
What is Gay-Lussac's Law
300
A 8.3 L gas sample at 1 atm is compressed to a volume of 2.8 L and the temperature is increased from 30˚C to 65˚C. What is the new pressure of the gas in atms?
What is 3.3 atm
300

What is the partial pressure of hydrogen gas in a mixture of hydrogen and helium if the total pressure is 600 mm Hg and the partial pressure of helium is 439 mm Hg?

161 mm Hg

300

When 3.00 L of propane gas is completely combusted to form water vapor and carbon dioxide at temperature of 350 degrees C and a pressure of 0.990 atm, what mass of water vapor will result?


C3H8 + 5O2  ---------> 3CO2 + 4H20

4.18 grams

400
This is the balanced chemical formula for H2 + N2 --> NH3
What is 3H2 + N2 --> 2NH3
400
combination of other three gas laws
What is the Combine Gas Law
400
A tire is inflated to 2.38 atm at 20˚C. The temperature outside drops to -5˚C. What will the new pressure in the tire be?
What is 2.18 atm?
400

A sample contains 4 moles of oxygen, 8 moles of nitrogen and 2 moles of hydrogen. If oxygen exerts a pressure of 1.5 atm, what is the pressure of nitrogen? 

14 moles total; mole ratio of nitrogen is 8/14. Mole ration of oxygen is 4/14. Partial pressure of oxygen = mole ratio X total pressure. 

Total pressure = 1.5 atm/(4/14) = 5.24 atm

partial pressure of nitrogen = 5.24 x (8/14) = 2.99 atm

400

Balance the equation below:

CO + NO  ------> N2 + CO2

If 42.7 grams CO is reacted completely at STP, what volume of N2 gas will be produced?

17.1 L

500
The ideal gas constant has a value of this
What is 0.0821 ?
500
A relationship between volume, pressure, temperature, and number of moles of a gas
What is the Ideal Gas Law
500
What is mass of chlorine gas in grams contained in a 15.0 L tank at 23˚C and 3.78 atm of pressure?
What is 166 g
500

A tank has a mixture of hydrogen, helium and krypton gases and has a volume of 250 L. There are 3 moles of hydrogen, 2 moles of helium and 1 mole of krypton. The container is in a room that is 35 degrees celsius. Calculate the pressure of helium gas. 

PV = nRT

p(250) = 6(0.0821)(308)

Ptotal = .607 atm

Pi = (3/6).607 = .304 atm

500

If 5.00 L of hydrogen gas, measured at 20.0 degrees C and 80.1 kPa is burned in excess oxygen to form water, what mass of oxygen (measured at the same temperature and pressure) will be consumed?

2.63 grams O2