The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres to 57°C. The tyre pressure had by the afternoon was?
-
A.
increased by 15.0cm Hg -
B.
decreased by 15.0cm Hg -
C.
increased by 22.50cm -
D.
decreased by 22.50cm Hg -
E.
remained constant
Correct Answer: Option A
Explanation
(frac{P_1}{T_1}) = (frac{P_2}{T_2}) at constant volume
(frac{150}{27 + 273}) = (frac{P_1}{57 + 273})
P2 = 165cmHg