How many molecules are in 1.2 moles of H20?

7.226 * 10^23 molecules.

Explanation: A compound is a substance that is made by two or more atoms from different elements. A mole of a compound contains a number of molecules equivalent to Avogadro's number, 6.022 * 10^23. That is, one mole of a compound contains 6.022 * 10^23 molecules.

In this case we are given;

Number of moles of H₂O as 1.2 moles

But, 1 mole of H₂O contains 6.022 * 10^23 molecules.

We are required to calculate the number of molecules present;

To calculate the number of molecules we are going to multiply the number of molecules in one mole by the number of moles. Therefore;

Number of molecules = 1.2 moles * 6.022 * 10^23 molecules/mole

= 7.226 * 10^23 molecules.

Thus, 1.2 moles of water contains 7.226 * 10^23 molecules.