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Chemistry

Determine the number of molecules in a drop of water which weighs 0.09 g.

Mole Concept

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Answer

Molecular wt. of any substance contain 6.022 × 1023 molecules.

Mass of 1 mole of water is 2H + O = 2 + 16 = 18 g

18 g of H2O contains 6.022 × 1023 molecules

∴ 0.09 g of H2O contains 6.022×1023×0.0918\dfrac{6.022 \times 10^{23} \times 0.09 }{18}

= 3.01 × 1021 molecules

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