24 how many moles are in 2.04 * 1024 molecules of h2o?

The answer is 3.39 mol.

Avogadro's number is the number of molecules in 1 mol of substance.

6.02 * 10²³ molecules per 1 mol.

2.04 * 10²⁴ molecules per x.

6.02 * 10²³ molecules : 1 mol = 2.04 * 10²⁴ molecules : x

x = 2.04 * 10²⁴ molecules * 1 mol : 6.02 * 10²³ molecules

x = 2.04 / 6.02 * 10²⁴⁻²³ mol

x = 0.339 * 10 mol

x = 3.39 mol