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Q.

A cylinder contains acetylene gas at 270C and 4.05 M Pa. The pressure in the cylinder after half the mass of gas is used up and temperature has fallen to 120C will be

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a

4.05 MPa

b

2.025 MPa

c

3.84 MPa

d

1.92 MPa

answer is D.

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Detailed Solution

PV=wMRT        PwT=constant

P1w1T1=P2w2T2 ⇒         4.05w×300=P2w2×285P2=1.92  MPa

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A cylinder contains acetylene gas at 270C and 4.05 M Pa. The pressure in the cylinder after half the mass of gas is used up and temperature has fallen to 120C will be