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Q.

N2 gas is present in one litre flask at a pressure of 7.6×10–10 mm of Hg. The number of N2 gas molecules in the flask at O°C is

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a

2.68×109

b

2.68×1010

c

1.34×1028

d

2.68×1022

answer is B.

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Detailed Solution

n=PVRT=7.6×10-10×1760×0.0821×273=4.46×10-14 Number of N2 molecules =4.46×10-14×6.02×1023=2.68×1010
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