The smallest dew drop has a mass of 1 ∙ 10-5 g. How many water molecules are there in one dew drop?
| November 26, 2020 | education
The smallest dew drop has a mass of 1 ∙ 10-5 g. How many water molecules are there in one dew drop? Calculate the number of atoms of all the elements contained in the droplet.
The number of molecules is calculated by the formula
N = ν * NA
ν = m (H2O) / M (H2O) = 1 * 10 ^ (- 5) / 18 = 0.06 * 10 ^ -5 (mol)
Hence N = 0.06 * 10 ^ (- 5) * 6.02 * 10 ^ 23 = 0.3612 * 10 ^ (- 115)
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