What is the final volume of 925 mL of hydrogen gas at 275 mm Hg if the pressure is increased to 975 mm Hg?

[temperature and amount of gas held constant..]

Answer:
Since PV=nRT, pressure is inversely proportional to volume. If the pressure is increased by a factor of 3.55, then the volume is decreased by 3.55, or 261 mL, assuming it behaves as an ideal gas.
For this question we have to use Boyle's law

at T = K

p1V1 = p2 V2

275 x 925 = 975 x V2

V2 = 261 mL

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