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Q.

One litre of a gas weights 2g at 300 K and 1atm pressure. If the pressure is made 0.75 atm, at what temperature will one litre of the same gas weight 1g

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a

900K

b

450K

c

600K

d

800K

answer is D.

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Detailed Solution

P1= 1 atm

T=300K

w=2g

V=IL

PV=nRT

1×1=2M×0.0821×300

M=2×3×821×10-1

M=49.26g

p=0.75 atm

V=IL

M=492.6g

W=1g

T=?

PV=nRT

PV=wMRT

T=0.75×1×49.260.0821=450K

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