1) Number of atoms of each element in: MgO a) 1 atom of magnesium and 1 atom of oxygen b) 1 atom of magnesium and 2 atoms of oxygen c) 2 atoms of magnesium and 2 atoms of oxygen 2) Number of atoms of each element in: H2O a) 2 atoms of hydrogen and 2 atoms of oxygen b) 2 atoms of hydrogen and 1 atom of oxygen c) 2 atoms of helium and 1 atom of oxygen 3) Number of atoms of each element in: Na2S a) 2 atoms of nitrogen and 1 atom of sulphur b) 2 atoms of sodium and one atom of sulphur c) 2 atoms of sodium and 1 atom of silicon 4) Number of atoms of each element in: CaCO3 a) 1 atom of calcium and 3 atoms of cobalt b) 1 atom of carbon, 3 atoms of carbonate c) 1 atom of calcium, 1 atom of carbon and 3 atoms of oxygen 5) Number of atoms of each element in: MgCl2 a) 1 atom of magnesium, 1 atom of chlorine b) 1 atom of magnesium and 2 atoms of chlorine c) 1 atom of magnesium, 1 atom of carbon and 2 atoms of iodine 6) Number of atoms of each element in: C2H5OH a) 2 atoms of carbon, 5 atoms of hydrogen, 1 atom of oxygen, 1 atom of hydrogen b) 2 atoms of carbon, 6 atoms of hydrogen and 1 atom of oxygen c) 2 atoms of carbon, 5 atoms of hydrogen, 1 atom of hydroxide 7) Number of atoms of each element in: Ba(OH)2 a) 1 atom of boron, 2 atoms of hydroxide b) 1 atom of barium, 1 atom of oxygen and 2 atoms of hydrogen  c) 1 atom of barium, 2 atoms of oxygen and 2 atoms of hydrogen  8) Number of atoms of each element in: Mg(NO3)2 a) 1 atom of magnesium, 2 atoms of nitrogen and 6 atoms of oxygen b) 1 atom of magnesium, 1 atoms of nitrogen and 3 atoms of oxygen c) 1 atom of magnesium, 2 atoms of nitrogen and 5 atoms of oxygen

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