calculate the molar weight of Freon-II, of 8.29 liters of its vapor at 200 degrees celcius and 790 mm Hg has a mass of 30.5 g.?

Answer 1

A gas sealed vial originally at 0.6 atm and 300 K, was heated at 450 K. What other property of the gas has changed? What is the value of this property after heating?

Answer 2

For the freon see your other post. For this other problem the pressure has changed. p1/t1 = p1/t2
t1 and t2 must be in kelvin.