First slide

Gaseous state

Question

What will be the new volume when 128 mL of gas at 20.0°C is heated to 40°C while pressure remains unchanged?

Moderate

A

64.0 mL
B

120 mL
C

128 mL
D

137 mL

Solution

$By Charles' law, \frac{V_{2}}{V_{1}} = \frac{T_{2}}{T_{1}} V_{2} = V_{1} \frac{T_{2}}{T_{1}} = 128 \times \frac{313}{293} = 137 mL$

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