Which of the following is the correct molar mass (in g/mol) of NH4Cl (s), the product formed in the reaction NH3(g) + HCl(g) → NH4Cl(s)?

• A. 58.5 g/mol
• B. 74.5 g/mol
• C. 53.5 g/mol
• D. 36.5 g/mol

Answer: (B)

Verified step by step guidance

1. Identify the chemical formula of the compound NH4Cl, which consists of 1 nitrogen (N) atom, 4 hydrogen (H) atoms, and 1 chlorine (Cl) atom.
2. Look up the atomic masses of each element from the periodic table: nitrogen (N) ≈ 14.0 g/mol, hydrogen (H) ≈ 1.0 g/mol, and chlorine (Cl) ≈ 35.5 g/mol.
3. Calculate the total mass contributed by each element in NH4Cl by multiplying the atomic mass by the number of atoms: for nitrogen, 1 × 14.0 g/mol; for hydrogen, 4 × 1.0 g/mol; for chlorine, 1 × 35.5 g/mol.
4. Add the masses of all atoms together to find the molar mass of NH4Cl: \(\text{Molar mass} = (1 \times 14.0) + (4 \times 1.0) + (1 \times 35.5)\) g/mol.
5. Sum these values to get the total molar mass of NH4Cl, which will help you identify the correct answer from the given options.