The volume of a fixed mass of gas is 10cm3 when its pressure is 400cmHg. Determine the volume of the gas when its pressure is 200cmHg.

The volume of a fixed mass of gas is 10cm3 when its pressure is 400cmHg. Determine the volume of the gas when its pressure is 200cmHg.
A. 30cm3
B. 40cm3
C. 50cm3
D. 20cm3

Correct Option: Answer is D
Using boyle’s law

P1V1 = P2V2

V2 = P1V1/200 = 400×10/200

= 20cm3

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