Question

A. a big drop of water has volume 1.0 ml. how many molecules of water are there in this drop,if the density of water is 1 g/ml?

Answer 1

Answer:

molecules in a drop of water = (6.022 x 1023 molecules/mole) x 0.002275 moles

molecules in a drop of water = 1.67 x 1021 water molecules

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Explanation:

Answer 2

Answer:

3.34 x 10^22 molecules

Explanation:

Volume of drop of water = 1.0mL

density of water = 1.0g/mL

Mass of drop of water = volume x density = 1.0g

Molecular mas of H2O = 2 x 1u + 1 x 16u

= 2u + 16u = 18u

Gram molecular mass of water = 18g/mol

18g of water contains = 6.022 x 10^23 molecules

1g of water contains = 6.022 x 10^23/18 molecules

= 3.34 x 10^23 molecules