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An evacuated glass vessel weighs 50.0 g ...

An evacuated glass vessel weighs `50.0 g` when empty, `148.0 g` when filled with a liquid of density `0.98 g mL^(-1)`, and `50.5 g` when filled with an ideal gas at `760 mm Hg` at `300 K`. Determine the molar mass of the gas.

A

100

B

110

C

122

D

90

Text Solution

Verified by Experts

The correct Answer is:
C
Mass of the gas ,`= 50.5 = 50 = 0.5` gm
mass of liquid `148-50 = 9.8 gm = 0.98 V_(m1) rArr V_(mL) = 100 m L`
Use : PV = nRT `rArr 1 xx 0.1 (0.5)/(M_(0)) xx 0.082 xx 300 rArr M_(0) = 123 gm`
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