Honors CHEM 1A
HAHS
MS. KNICK
STUDY GUIDE: GAS LAWS
Your test is on Friday, 1/8/2016.
nRT
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EXCUSE ME….
THINGS TO KNOW:
1.
2.
3.
4.
5.
The unique properties of gases.
The 4 measurable properties of gases.
Ideal Gas vs. Real Gas
Gas Law Formulas and the value of R.
What does STP mean? What is the value of temperature? What is the value of pressure?
BOYLE’S LAW
1. Know the relationship between pressure and volume (direct or indirect), be able to write the
relationship using a mathematic expression, and be able to explain why/how the properties affect
each other as they do.
2. Given a set of data, be able to determine which variables go together and be able to use the expression
for Boyle’s Law to solve for pressure or volume.
a. A gas has a pressure of 1.26 atm and occupies 7.4 L. If the gas is compressed to 2.93 L, what will its
pressure be assuming constant temperature? 3.2 atm
b. A weather balloon with a volume of 1.375 L is released from the Earth’s surface at sea level( 100kPa.)
What volume will the balloon occupy at an altitude of 20.0 km where the pressure is 10kPa? 14 L
CHARLES’LAW
1. Know the relationship between temperature and volume (direct or indirect), be able to write the
relationship using a mathematic expression, and be able to explain why/how the properties affect
each other as they do.
2. Given a set of data, be able to determine which variables go together and be able to use the expression
for Charles’ Law to solve for temperature or volume.
Honors CHEM 1A
HAHS
MS. KNICK
a. A balloon filled with oxygen gas occupies a volume of 5.5 L at 25C. What will the volume be at 100C?
6.9L
b. A sample of air has a volume of 140 mL at 67C. At what temperature will its volume be 50 mL at
constant pressure? 123 K
GAY-LUSSAC’S LAW
1. Know the relationship between temperature and pressure (direct or indirect), be able to write the
relationship using a mathematic expression, and be able to explain why/how the properties affect
each other as they do.
2. Given a set of data, be able to determine which variables go together and be able to use the expression
for Gay-Lussac’s Law to solve for pressure or temperature.
a. Sample of hydrogen at 47C exerts a pressure of 0.329 atm. The gas is heated to 77C at constant volume.
What will its new pressure be? 0.360 atm
b. A sample of helium gas has a pressure of 1.2 atm at 22C. At what celcius temperature will the helium
reach a pressure of 2 atm? 493 K
COMBINED GAS LAW
1. Be able to write the mathematic expression…what is the formula?
2. Given a set of data, be able to determine which variables go together and be able to use the expression
to solve for pressure, temperature, or volume.
a. 2.00 L of a gas is collected at 25.0°C and 745.0 mmHg. What is the volume at STP? 1.8L
b. Carbon dioxide occupies a 2.54 L container at STP. What will be the volume when the pressure is 150
KPa and 26oC? 1.88 L
IDEAL GAS LAW
1. Given a set of data, be able to solve for an unknown using the ideal gas law.
a. A sample that contains 4.38 mol of a gas at 250.0K gas a pressure of 0.857 atm. What is the volume?
105L
b. What pressure, in atm, is exerted by 0.325 mol of hydrogen gas in a 4.08L container at 35C? 2.01 atm
GAS LAW STOICHIOMETRY
1. How many grams of AlCl3 must decompose in order to produce 3.10 dm3 of Cl2 gas at 50.0C and 98.4 kPa?
(HINT: dm3 is a decimeter cubed, which is a unit for volume.)
___AlCl3

___Al
+
___Cl2
2. What volume of nitrogen can be produced by the decomposition of 50.0 g of NH4NO2 at 25C and 1.20 atm?
___NH4NO2

___N2
+
___H2O
Honors CHEM 1A
HAHS
MS. KNICK