Question

no of molecules in one liter of water is
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Answer 1

The liter of water has 1000 grams. The number of moles is 1000/18 = 55.556 moles.The number of molecules is therefore 6.022*1023 * 55.556 = 3.346*1025 molecules.The number of atoms is 3 times larger because each molecule has three atoms, so there are 1.0038*1026 atoms in a liter of water.