States of Matter (Gaseous and Liquid States)

Weight of empty glass vessel =40‌gm
Weight of glass vessel filled with liquid =135‌gm
∴ Weight of liquid =135−40=95‌gm
Given density of liquid =0.95‌gm‌ml−1
∴ Volume of liquid =‌

95

0.95

=100‌ml
Weight of glass filled with ideal gas =40.5‌gm
∴ Weight of gas =40.5−40=0.5g
Let the Molar mass =M
∴ Moles of gas =‌

0.5

M

∴ Now applying ideal gas equation,
pV=nRT
⇒0.82×‌

100

1000

=‌

0.5

M

×0.082×250
⇒M=0.5×250=125g∕mol