1 Answer

Azog · Answer 1 · 2020-11-09T10:37:18+0000

$\textbf{1.3877}*\textbf{10}^{\textbf{17}}\textbf{ mol}$

Explanation:

We are considering
$2.5*10^(18)\text{ }g$ of water.

We know that each mole of a substance weights equal to the substances' molar weight.

The molar weight of water (
H_(2)O ) is
$18.0153\text{ }(g)/(mol)$ . This value is a standard and hence can be found from charts.

$\text{Number of moles of compound = }\frac{\text{Weight of sample given}}{\text{Molar weight of compound}}$

$\text{Number of moles of water present = }\frac{2.5*10^(18)\text{ }g}{18.0153\text{ }(g)/(mol)}\text{ = }1.3877*10^(17)\text{ }mol$

∴ Number of moles of water =
$1.3877*10^(17)\text{ }mol$

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