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Question
Find the number of molecules in 3.2 g of SO2.
Solution
Molecular mass of SO2 = 32 + (2 x 16) = 64 g
Number of molecules in 64 g of SO2 = 6.02 x 1023
∴ Number of molecules in 3.2 g of SO2 = `(6.02 xx 10^23)/4 xx 3.2`
= 3.01 x 1022
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