question_answer

  Write the formulae for the following and calculate the molecular mass for each one of them. (a) Caustic potash            (b) Baking soda (c) Limestone                    (d) Caustic soda (e) Ethanol                          (f) Common salt

Answer:

   (a)KOH Molecular mass of KOH = 39 +16 +1 = 56u (b) Molecular mass of = 23 + 1 + 12 + 3 x 16 = 23 + 1 + 12 + 48 = 84 u (c) , Molecular mass of = 40 +12 + 3 x 16 = 100 u (d) NaOH Molecular mass of NaOH = 23 + 16 +1 = 40 u (e) Molecular mass of  or = 2 x 12 + 6 x 1 + 16 = 24 + 6 + 16  = 46 u (f) NaCI Molecular mass of NaCl =23+35.5 =58.5 u