Question

1. How will you account for the observation that automobile tyre is inflated with lesser air in summer than in winter? 

2. A sample of gas occupies 250 mL at 27 °C. What volume will it occupy at 35 °C if there is no change in pressure?

Answer 1

1. This can be explained on the basis of Gay Lussac’s law, according to which at constant volume, pressure of a fixed amount of a gas varies directly with the temperature. In summer season the temperature will be higher. Hence, pressure will increase and the tyre may burst if filled with more air. But during winter temperature is low and hence pressure will below.

2. According to Charles’ law,

\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\) (at constant p and n)

V₂ = \(\frac{V_1T_2}{T_1}\) = \(\frac{250\,ml\times308\,K}{300k}\) = 256.7mL​​​​​​