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Q.

How many moles of He gas occupy 22.4 litres at 300C and one atmospheric pressure

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a

0.11

b

0.90

c

1.11

d

1.0

answer is A.

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Detailed Solution

P1V1n1T1=P2V2n2T2n2=P2V2T1P1V1T2

at STP n1=one mole                                             at T=2730+300=3030K

P1=1atmV1=22.4ltT1=2730K                                                        P2=1atmV2=22.4

n2=11×22.422.4×273303×1=0.9 moles                                                                                                                

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