2. Write out All the Starting Information, in a Column

Directions: Solve the following problems by using the Ideal Gas Law (PV = nRT). Show all of your work, as seen in the example below. Remember, if the units of your pressure, volume, temperature, and amount of substance do not match your R value, you must convert them first. Box your answers!

Example: A sample of neon gas occupied a volume of 25.0 L @ 32.0°C and 777 mmHg of pressure. How many grams of neon were present in the sample?

1.  Decide which rearrangement of the Ideal Gas Law to use, based on the information given. Write it down in this form.

2.  Write out all the starting information, in a column.

3.  Convert all Celsius temperatures to Kelvin, by adding 273.

4.  Convert units of each variable, if necessary, to match the units found in the R value (L, atm, mol, and K). This may or may not be necessary.

5.  Plug in your information into the rearranged equation, canceling all units except for the one you need in your answer.

6.  Calculate and box your answer, with the appropriate unit.

1.  If 34.5 g of methane were contained in a balloon with a volume of 2000 mL and under a pressure of 105.9 kPa, what would the temperature of this methane gas be?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K
2.  What will be the volume of .70 grams of chlorine gas at standard temp and 150.0 kPa?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K / 3.  Underground caverns often contain massive amounts of methane gas under high pressures. How many grams of methane could be contained in a cavern able to hold 2.33 x 107 L @ 15.0 atm and 44.1°C?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K
4.  How many moles of argon are there in a 27.3 L sample of gas @ 12.5 psi and 50.5°C?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K / 5.  Find the volume occupied by 23.22 g of oxygen gas at 25°C and 745 mmHg.
P = ______
V = ______
n = ______
T = _____ °C ® _____ K
6.  What pressure will be exerted by 0.450 mol of a gas @ 25°C if it is contained in a vessel whose volume is 650 mL?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K / 7.  What would be the volume of a sample of CO2 if the sample contained 400 grams @ 35°C and 785 mmHg?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K
8.  You fill a rigid steel container with a volume of 20.0 L with nitrogen gas to a pressure of 2,000 kPa @ 27°C. How many moles of nitrogen gas does the cylinder contain?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K / 9.  What temperature would 67.9 g of ammonia (NH3) be at if its container had a volume of 3400 mL at 50.76 psi?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K
10. What pressure will be exerted by 5.63 mol of a gas @ 52°C if it is contained in a vessel whose volume is 8.41 L?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K / 11. If 84.63 g of propane were contained in a balloon with a volume of 742.33 mL and under a pressure of 423.7 kPa, what would the temperature of this propane gas be?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K
12. What will be the volume of 72.36 grams of fluorine gas at -16°C and standard pressure?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K / 13. How many grams of oxygen gas could be contained in a cave able to hold 4.11 x 108 L @ 5850 mmHg and 59.38°C?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K
14. You fill a rigid steel container with a volume of 51.2 L with bromine gas to a pressure of 4,523 kPa @ -106.3°C. How many grams of bromine gas does the cylinder contain?
P = ______
V = ______
n = ______
T = _____ °C ® _____ K / 15. Calculate the pressure of 16.5 g of He gas @ 16°C occupying 3.25 L.
P = ______
V = ______
n = ______
T = _____ °C ® _____ K