Question

How many molecules are in 1.2 moles of H₂O?

Answer 1

There are 7.2 x 10^23 molecules of H2O in 1.2 moles.

Answer 2

7.226 x 10^33 molecules.

Step-by-step 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.