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Question
Which of the following contains maximum number of molecules?
Options
4g of O2
4g of NH3
4g of CO2
4 g of SO2
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Solution
4g of NH3
Explanation:
Molecular mass of O2 = (2 x 16) = 32 g
Molecular mass of NH3 = 14 + (3 x 1) = 17 g (least weight)
Molecular mass of CO2 = 12 + (2 x 16) = 44 g
Molecular mass of SO2 = 32 + (2 x 16) = 64 g
∴ 4 g of NH3 contains = `(6.02 xx 10^23)/17 xx 4`
= 1.41 x 1023
∴ 4 g of NH3 having minimum molecular mass contain maximum molecules.
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