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Edexcel | Physics WPH0 | S 11 5 1 | 1 hour 30 minutes
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A football has a diameter of 22.5 cm. It contains air at a temperature of 20°C and a

pressure of 1.65 × 105 Pa. When the football is left in direct sunlight, the temperature of the air in the football increases to 40°C.

In the following calculations, assume that the volume of the football remains constant.

14
(a) (I)
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2 Mark s

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(a) (II)
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1 Mark

State another assumption you made in your calculation.

Air behaves as an ideal gas / mass of air remains constant / number

of molecules remains constant/same amount of air/number of moles

remains constant/no air escapes

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(b)
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Air is then released from the football until the pressure returns to its original value.

Assuming that the temperature remains at 40°C, calculate the number of molecules

that escape.

 

                                    Number of molecules escaping = ..................................

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