A sample of H2 gas occupies a volume of 565 mL at STP. What, volume, in mL, will this sample of H2gas occupy at a temperature of -17oC and at a pressure of 0.560 atm

Answer 1

Do you know that STP stands for standard temperature and pressure.
Standard T is 273 K and standard pressure is 1 atmosphere.
Use (P1V2/T1) = (P2V2/T2)
Don't forget to change degrees C to kelvin. Post your work if you run into trouble.

Answer 2

946mL

Answer 3

Correct. Good work.