Tuition Center Singapore JC Chemistry Tuition – Gases

The pressure rating of a car tire is typically given to be 210 kPa. This is based on an internal air temperature of 25°C.

A driver decides to inflate the tires of his car to the rated pressure after driving at a high speed for some time, during which the internal air temperature has risen to 40°C.

What will be the drop in pressure in each tire when the temperature has returned to 25°C?

A       9.3 kPa                  B       10.1 kPa             C     78.8 kPa              D      200 kP

Answer B

Since V, n, R remains constant,

P1/ T₁= p₂ / T₂

210 / (40 + 273) = p₂ / (25 + 273)

p₂ = 199.3 kPa

Drop in pressure = 210 –199.9 =10.1 kPa

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