Discussion

63 g/mol HNO₃ contains :

Answer: A

The 63 g contains \(6.022 \times 10^{23}\) HNO₃ molecules.

The molar mass of nitric acid is

\[ 1 + 14 + 3 \times 16 = 63\ \text{g/mol} \]

so 63 g of HNO₃ is exactly one mole, and one mole of any substance contains Avogadro's number of particles, \(6.022 \times 10^{23}\).

A single molecule weighs only about \(1.05 \times 10^{-22}\) g, so 1, 100 or 1000 molecules are vanishingly small masses, nowhere near 63 g.

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