Question

I can't figure out which equation I need to use to start this?
If a 10. m3 volume of air (acting as an ideal gas) is at a pressure of 760 mmhg and a temperature of 27 degrees Celsius is taken to a high altitude where the pressure is 400. mmhg and a temperature of -23 degrees Celsius, what volume will it occupy? (Hint: remember the temperature must be in Kelvin.)

Answer 1

PV=nRT