Answer:
(a) 1
mol of water contains 6.022 x 1023 molecules
0.5 mol ot water contains molecules = 3.011 x 1023
molecules
(b) 1 molecule of water contains 2 atoms of hydrogen 1 mol
of water contains 2 x 6.022 x 1023 atoms of hydrogen
0.5 mol of water contains atoms of hydrogen = 6.022 x 1023
atoms of hydrogen
(c) 1 molecule of water contains 1 atom of oxygen 1 mol of
water contains 6.022 x 1023 atoms of oxygen
0.5 mol of water contains atoms of oxygen = 3.011 X 1023
atoms of oxygen
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