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  • 18-09-2017
  • Chemistry
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How many atoms of hydrogen are present in 2.92 g of water?

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tonb
tonb tonb
  • 18-09-2017
The molecular weight of water is 18.01528 g/mol.
So in 2.92 grams there are 2.92/
18.01528 = 0.1621 mol of particles.

1 mol contains 6,02214 × 10^23 particles by definition.

So the nr of H2O molecules is 
0.1621 * 6,02214 × 10^23 = 0,9761 × 10^23.

Every molecule has 2 H atoms, so you have to double that.

2* 0,9761 × 10^23 = 1.952 × 10^23.
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