# How many atoms are in 65.5g of potassium oxide (K2O)?

I am stuck on this question, can someone please show me the steps in calculating this problem?

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- az_lenderLv 78 months ago
Molar mass of K2O is 94.2 g/mol, so the 65.5g would be 0.695 moles, which is 4.19 x 10^23 molecules. Each molecule has 3 atoms, so there are 1.26 x 10^24 atoms here.

- bee killerLv 78 months ago
First determine the molecular mass of K2O.

65.5g K2O x (Imole K2O/94.2gK2O) x 6.02x10^23 molecules/1mole K2O) x (3 atoms in one molecule/1mole of K2O) = the answer to the problem.

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