what is the number of atoms present in 0.05g of water?
The molar mass of water (H2O) is 18.0 grams/mol (1.008 + 1.008 + 16.0). This means there is one mole of water in 18.0 grams. One mole contains 6.022 × 1023 atoms/molecules/ions.
0.05g / 18.01528g/mol = 0.0028mol.
The ratio of hydrogen and oxygen in H2O is 2:1, which means, there are
- 0.0056mol of hydrogen
- 0.0028mol of oxygen.
There are 6.022 x 1023 particles per mole.
Number of hydrogen atoms:
Number of oxygen atoms:
0.0028mol x 6,02214179x1023mol-1 =16.9x1020