The volume of a certain amount of a gas at 25^@Cand at 100 cm pressure is 80 mL. The gas is expanded to 140.5 mL keeping temperature constant. Calculate the pressure of the expanded gas.

The volume of a certain amount of a gas at 25^@Cand at 100 cm pressure

1.	The volume of a certain amount of a gas at 25^@Cand at 100 cm pressure is 80 mL. The gas is expanded to 140.5 mL keeping temperature constant. Calculate the pressure of the expanded gas.
Answer» Solution :In the present CASE, `P_1 = 100 cm Hg, ""P_2` = ? `V_1 = 80 mL, "" V_2 = 140.5 mL` According to Boyle.s law, at constant TEMPERATURE `P_1 V_1 = P_2 V_2` or `P_2 = (P_1 V_1)/(V_2) = (100xx80)/(140.5)=56.94 cm` Hg Hence, the pressure of the expanded gas will be 56.94 cm Hg.