Question

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

Answer 1

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

Step-by-step explanation:

       We are considering $2.5\times10^{18}\text{ }g$ 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 $18.0153\text{ }\frac{g}{mol}$. This value is a standard and hence can be found from charts.

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

       $\text{Number of moles of water present = }\dfrac{2.5\times10^{18}\text{ }g}{18.0153\text{ }\frac{g}{mol}}\text{ = }1.3877\times10^{17}\text{ }mol$

∴ Number of moles of water = $1.3877\times10^{17}\text{ }mol$