Pressure qn?

Question

at first, the diver jumps into the sea with his oxygen tank that has a capacity of 0.50m3 that is filled with oxgen at 200atm. After he surfaces back on to land, he found out thta the pressure has dropped to 150 atm. How many cubic metres of oxgen, measures at atmospheric pressure did he used?

Answer 1

use the gas law

p(initial) v(initial)=p(final) v(final)

so,

(.50 X 200)/150 =0.6667m3

al d bst