This Formula Is Used When You Have a Gas and You Are Trying to Find Moles, Volume, Pressure

Ideal Gas Law

PV = nRT

This formula is used when you have a gas and you are trying to find moles, volume, pressure, or temperature.

P = pressure n = number of moles

V = volume T = temperature in Kelvin

R = Universal Gas Constant

R = 0.0821 atm L R = 62.4 mmHg L

mol K mol K

1.  Calculate the volume, in liters, of 2.15 moles oxygen gas at 298 K and 1.25 atm.

Step 1 List the information

P= n =

V= R =

T =

Step 2 Write down the formula

Step 3 Plug the numbers into the formula

Step 4 Report the answer

2.  What are the values for the temperature and pressure at STP?

Pressure= atm or mmHg

Temperature= oC or Kelvin

3.  What is the volume of 1 mole of a gas at 273 K and 1 atm?

4.  If a 2.8 mole sample of gas initially occupies 54 L at 3.8 atm, what is its temperature in K?

5.  How many moles of gas are present if a particular sample occupies 2.94 L with a pressure and temperature of 450 torr and 315 K respectively?

6.  How many moles of gas are present in a 500 mL container at STP?

7.  What is the temperature in oC if you have 4 moles of gas that occupy 224 L liters at 1 atm? (Remember to convert from K to oC)

8.  How many moles of an ideal gas are in 1.0 mL if the temperature is -80 °C and the pressure is 0.0010 torr? (Remember to convert from oC to K)

9.  What is the volume of 1.2 moles of gas at 0.5 atm and 200 K?

10.  How many moles would be present under the following conditions 200 mL of gas at 800 torr are at 1000C?

11.  What is the pressure of gas if 5 moles occupies 2 liters at and 298 K?

12.  What is the pressure of gas if 14.8 moles occupies 3.75 liters at and 32 °C? (Remember to convert from oC to K)