Question

Example 3.1 (a) Calculate the relative
molecular mass of water (H2O).
(b) Calculate the molecular mass of
HNO3 ,​

Answer 1

Answer:Atomic mass of hydrogen = 1u, oxygen = 16 u <br> So the molecular mass of water, which contains two atoms of hydrogen and one atom of oxygen is = 2 × 1+ 1×16 = 18 u <br> (b) The molecular mass of

= the atomic mass of H + the atomic mass of N+ 3 × the atomic mass of O <br> = 1 + 14 + 48 = 63u

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Answer 2

☘️ Solution :

(a) Atomic mass of hydrogen = 1 u,

oxygen = 16 u

So, the molecular mass of water, which contains two atoms of hydrogen and one atom of oxygen is

= 2 × 1 + 1 × 16

= 18 u

(b) The molecular mass of $\sf HNO_3$ = the atomic mass of H + the atomic mass of N + 3 × the atomic mass of O

= 1 + 14 + 48 = 63 u