Question

Plz answer thx ​How many moles are in 2.5 x 10^18 grams of water?

Answer 1

`\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`