The volume of a sample of hydrogen gas was decreased from 11.95 L to 5.24 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 9.31 atm, what pressure did the hydrogen gas exert before its volume was decreased?

P1 = 21.23 atm

Explanation:

Initial Volume V1 = 11.95 L

Final Volume V2 = 5.24L

Final Pressure P2 = 9.31 atm

Initial Pressure P1 = x

The relationship between these values is given as;

P1 / V1 = P2 / V2

P1 / 11.95 = 9.31 / 5.24

P1 = 21.23 atm

the answer to your question is c