Combined Gas Law for beginners

A 3.0 liter container of nitrogen has a pressure of 2.2 atm. What volume would be necessary to decrease the pressure to 0.5 atm? (round to the tenths place)

If I have 6.5 liters of gas in a piston at a pressure of 2.5 atm and then compress the gas until its volume is 8.4 L, what will the new pressure inside the piston be? (round to the tenths place)

A sample of gas has a pressure of 200.0 mm Hg and a temperature of 127.0 degrees Celsius. Calculate the resulting pressure if the temperature changed to 227.0 degrees Celsius while the volume remains constant.

A small research submarine with a volume of 150000 L has an internal pressure of 2.0 atm and an internal temperature of 20 degrees Celsius.  If the submarine descends to a depth where the pressure is 200 atm and the temperature is 2.0 degrees Celsius, what will the volume of the gas inside be if the hull of the submarine breaks? (round to the hundredths place)

The gas left in a used aerosol can is at STP.  If this can is thrown onto a fire, what is the internal pressure of the gas when its temperature reaches 1527 degrees Celsius? (round to the tenths place)