What is the mass, in grams, of a 2.16-mol sample of HNO3?

• A. 136 g
• B. 98 g
• C. 210 g
• D. 163 g

Answer: (D)

Verified step by step guidance

1. Identify the chemical formula of the compound, which is HNO\_3 (nitric acid).
2. Calculate the molar mass of HNO\_3 by summing the atomic masses of its constituent atoms: hydrogen (H), nitrogen (N), and oxygen (O). Use the atomic masses approximately as H = 1 g/mol, N = 14 g/mol, and O = 16 g/mol.
3. Write the expression for the molar mass: \(\text{Molar mass of HNO\_3} = 1 \times 1 + 1 \times 14 + 3 \times 16\) g/mol.
4. Use the formula relating moles, molar mass, and mass: \(\text{mass} = \text{moles} \times \text{molar mass}\).
5. Substitute the given number of moles (2.16 mol) and the calculated molar mass into the formula to find the mass in grams.