Question

How many atoms are in 0.5 mole of water

Answer 1

1 mole of molecules = 6.022*10^23 molecules

Use dimensional analysis to calculate the number of molecules of H2O in 0.5 mol H2O.

0.5 mol H2O x 6.022*10^23 molecules/mol = 3*10^23 molecules H2O to one significant figure

There are ~3*10^23 molecules of H2O in 0.5 mole

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