question_answer 20)

Calculate the molar mass of the following substances.                              (a) Ethyne, C2H2         (b) Sulphur molecule, S8   (c) Phosphorus molecule, P4   (atomic mass of phosphorus = 31)                       (d) Hydrochloric acid, HCl                                                            (e) Nitric acid, HNO3.                                                         

Answer:

(a) Molar mass of  atomic mass of  atomic mass of   (b) Molar mass of  atomic mass of                                          (c) Molar mass of  atomic mass of P                                       (d) Molar mass of  atomic mass of H + atomic mass of   (e) Molar mass of  atomic mass of H + atomic mass of  atomic mass of