Question

A collapsed polythene bag of 3 litre capacity is
partially filled by 1 litre of Helium gas at 0.3 atm
pressure at 300 K. Subsequently enough Ne gas
is filled to make total pressure 0.4 atm at 300
K. The mole fraction of Ne gas in bag is
1
(1)
(2)
2
-17 mit
1
(3)
(4)
3​

Answer 1

Answer:

Correct option is

C

1/3

Let n be the moles of Helium.

Using, PV=RTn

⟹0.3×3=0.0821×300×n

⟹n=0.0365 mol

Let x be the moles of Neon gas

⟹0.4×3=(0.0365+x)×0.0821×30

⟹x=0.0122 moles

MolesofHelium

MolesofNeon

=

0.0365

0.0122

=

3

1

Correct option is

C

1/3

Let n be the moles of Helium.

Using, PV=RTn

⟹0.3×3=0.0821×300×n

⟹n=0.0365 mol

Let x be the moles of Neon gas

⟹0.4×3=(0.0365+x)×0.0821×30

⟹x=0.0122 moles

MolesofHelium

MolesofNeon

=

0.0365

0.0122

=

3

1