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Question
Deduce the number of molecules of the following compound in the given quantity.
7.1 g chlorine
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Solution
No. of moles in chlorine = `"Mass of chlorine in grams"/"Molecular mass of chlorine"`
= `7.1/71`
= 0.1 mole
∴ 0.1 moles of Cl2 contains = 0.1 × 6.022 × 1023 molecules
= 0.6022 × 1023 molecules
∴ The number of molecules in 7.1 grams of chlorine is 6.022 × 1023
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