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Question

Oxygen is present in a 1-liter flask at a pressure of 7.6×1010 mm of Hg at 0oC. Calculate the number of oxygen molecules in the flask.

A
3.65×109
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B
2.65×1010
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C
5×1010
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D
2.65×1010
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Solution

The correct option is B 2.65×1010
Pressure = 7.6×1010 mm Hg
= 7.6×1010760 [1 atm = 760 mm Hg]
= 1012 atm

Volume = 1 liter

Temperature = 0oC = 273 K

We know pV=nRTn=pVRT

n = 1012×10.0821×273=0.44×1013
No. of molecules = no.ofmoles×Avogadroconstant
= 0.44×1013×6.022×1023
= 2.65×1010.

answer is B

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