1.

(a) Calculate the relative molecular mass of water (H_(2)O). (b) Calculate the molecular mass of HNO_(3).

Answer»

Solution :(a) Atomic mass of hydrogen = 1 u
Atomic mass of oxygen = 16 u
So, the MOLECULAR mass of water, which CONTAINS two atoms of hydrogen and ONE atom of oxygen = 2 (atomic mass of H) + 1 (atomic mass of O)
= 2(1) + 1(16) = 18 u
(b) The molecular mass of `HNO_(3)` = 1 (atomic mass of H) + 1 (atomic mass of N) + 3 (atomic mass of O)
= 2(1) + 1(14) + 3(16)
= 1 + 14 + 48
= 63 u


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