Agas has a volume of 100.0 ml at a pressure of 780 mm hg. what is the volume of the gas when its pressure is increased to 880 mm hg?

The answer is 88.6 mL.

According to the Boyle's law pressure and the volume of a gas are inversely proportional at the constant temperature for a fixed mass:
P = k/V
or
P * V = k

So:
k = P1 * V1 = P2 * V2 = ...

We know that:
P1 = 780 mm Hg
V1 = 100 mL
P2 = 880 mm Hg
V2 = ?

780 * 100 = 880 * V2
V2 = 780 * 100 / 880
V2 = 

A

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