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Question

# Oxygen is present in a 1-liter flask at a pressure of 7.6×10−10 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 2.65×1010Pressure = 7.6×10−10 mm Hg= 7.6×10−10760 [1 atm = 760 mm Hg]= 10−12 atmVolume = 1 literTemperature = 0oC = 273 KWe know pV=nRT→n=pVRTn = 10−12×10.0821×273=0.44×10−13No. of molecules = no.ofmoles×Avogadroconstant= 0.44×10−13×6.022×1023= 2.65×1010.answer is B

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