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MCAT Chemistry Question — Charles’s Law

According to Charles’s Law, what happens to a gas as the temperature is decreased?

A. Volume decreases
B. Pressure decreases
C. Volume increases
D. Number of moles of gas increases

Click for Explanation

Charles’s Law states:

V1 / T1 = V2 / T2

It represents the direct relationship between volume and temperature for an ideal gas. Thus, as T decreases, so does V, making (A) the right answer.

B: This would by true by Gay-Lussac’s Law: P1/T1 = P2/T2

C: The relationship between T and V is direct, not inverse.

D: The number of moles of gas figures into Avogadro’s Law: V1/n1 = V2/n2

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