Discussion
Calculate molar mass of HNO3 :
Answer: B
The molar mass of nitric acid, HNO3, is 63 g/mol.
Add the atomic masses of one hydrogen, one nitrogen and three oxygen atoms:
\[ \begin{aligned} M &= 1 + 14 + 3 \times 16 \\ &= 1 + 14 + 48 = 63\ \text{g/mol} \end{aligned} \]
48 g/mol is the mass of the three oxygen atoms alone. 62 g/mol is the nitrate ion, NO3-, without the hydrogen. 49 g/mol is the equivalent weight of sulphuric acid (98 divided by 2), a figure from a different calculation.
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