What is the wavelength (in nanometers) of a photon emitted during a transition from ni = 6 to nf = 3 states in the H atom?

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

Can someone me with 6 to 10 plz this is for masteries test.

What is the molar mass of ca(cio4)2