Posted by Heather on Tuesday, December 1, 2009 at 12:47am.
First you need the molar mass of water(H2O).
Given that oxygen is 16 g mole^-1 and hydrogen is 1 g mole^-1 the molar mass of water is 18 g mole^-1.
Next we need the number of moles of water that 10.0 g represents (N) which we get from
N=10.0 g / 18 g mole^-1
as one mole contains 6x10^23 molecules then
Nx6x10^23 is the number of molecules.
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