Question

Calculate the number of H2O molecules in one drop of water having a mass
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Answer 1

Explanation:

• molecules in a water drop = (6.022 x 102^3 molecules/mole) x 0.002275 moles.
• molecules in a water drop = 1.67 x 10^21 molecules of water.

Answer 2

Answer:

Molecular mass of water =18g

no. of molecules in 0.05 g of water =0.05/18

=2.78 × 10(-3) molecules

=one molecule =6.023 × 10(23) molecules

Therefore,

=2.78 × 10(-3) molecule of water contains =2.78 × 10(-3) × 6.023 × 10(23) molecules

=1.67 × 10(21) molecules.

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