Question

The density of a gas is found to be 1.5kg/m³at 273k at a pressure of 1 bar .What is the molar mass of the gas?​

Answer 1

Answer:





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Question



Density of a gas is found to be 5.46 g/dm3 at 27∘C and 2 bar pressure. What will be its density at STP?

A

3.0 g dm−3

B

5.0 g dm−3

C

6.0 g dm−3

D

10.82 g dm−3

Medium

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Solution



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Correct option is

A

3.0 g dm−3

P=VnRT=Vm×MRT=MdRT

or d=RTPM or d∝TP

d2d1=P2P

Answer 2

Answer:

Pressure is p=745mm=0.98atm (1 atm = 760 mm Hg)

Temperature is T=65

0

C=65+273=338K

density is d=1.56g/L

P=

M

dRT

where M is molecular wt.

⟹M=

P

dRT

⟹M=

0.98

1.56×338×0.0821

=44.2u

Hence, the molecular mass of the gas is 44.2u.