How do you do this Chem problems...please help,thanks?

A 10. L container is filled with 1.0 mole of O2 gas at a temperature of 30 °C and pressure of 1890 torr.

1) What is the pressure if the container size is doubled while keeping the temperature and number of moles constant?

2) What is the pressure if the temperature is doubled while keeping the size of the container and number of moles constant?

3) What is the pressure if the amount of O2 gas is cut in half while keeping the size of the container and the temperature constant?

4) What is the pressure if 1.0 mole of N2 gas is added to the container while keeping the temperature and the size of the container the same?

Answer:
Use PV = nRT

Where:

P= Pressure (in Atmospheres)
V= Volume (in Liters)
n= number of moles
R= 0.0821 L*atm./mol*K
T= Temperature (in Kelvin)

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