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Question

The density of an ideal gas at 27 oC and pressure of 1 atm is 1.8×103 g/cm3, find the number of molecules in 90 g of gas.

A
12×1023
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B
12×1025
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C
24×1023
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D
24×1025
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Solution

The correct option is A 12×1023
Pρ=RTM
M=RTρP=8.3×300×1.8×103×103105×108=45 g
n=9045=2 mole
N=2×6.02×1023=12×1023

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