How many moles of H2O contain 3.99 x 10^65 molecules? *

0.66 × 10⁴² mol

Explanation:

Given data:

Moles of  water = ?

Number of molecules of water = 3.99× 10⁶⁵ molecules

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ molecules of water

3.99× 10⁶⁵ molecules × 1 mol /  6.022 × 10²³ molecules

0.66 × 10⁴² mol