Write the formulae for the following and calculate the molecular mass for each one of them.
(a) Caustic potash
(b) Baking powder
(c) Lime stone
(d) Caustic soda
(e) Ethanol
(f) Common salt
(a) The chemical formula of caustic potash is KOH.
Molecular mass of Caustic potash (KOH) = The molar mass of K + the molar mass of O + molar mass of H
= 39 + 16 + 1 = 56g/mole
(b) The chemical formula of baking powder is NaHCO3.
Molecular mass of baking powder (NaHCO3) = 23 + 1 + 12 + 3 X 16
= 84g/mole
(c) The chemical formula of Lime stone is CaCO3.
= 40 + 12 + 3X16
= 100g/mole
(d) The chemical formula of Caustic soda is NaOH.
Molecular mass of Caustic soda (NaOH) = 23+ 16+1
= 40g/mole
(e) The chemical formula of Ethanol is C2H5OH.
Molecular mass of Ethanol (C2H5OH) = 2 X 12 + 5 X 1 + 16 + 1
= 46g/mole
(f) The chemical formula of Common salt is NaCl.
Molecular mass of Common salt (NaCl) = 23 + 35.5 = 58.5g/mole