How many H-atoms are present in 0.046 g of ethanol?

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answer is 4.

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Detailed Solution

Mol. wt. of C2H5OH = 2×12 + 5 + 16 +1 = 46 ∵ 46 g C2H5OH has 6 × NA of H-atoms ∴ no.of H-atoms in 0.046g of C2H5OH = 6 × 6.02 × 1023 × 0.04646 = 3.6 × 1021

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