What is the molar mass of ammonia (NH_3)?

• A. 16.00 g/mol
• B. 17.03 g/mol
• C. 18.02 g/mol
• D. 15.99 g/mol

Answer: (B)

Verified step by step guidance

1. Identify the chemical formula of ammonia, which is NH\_3, meaning it contains 1 nitrogen (N) atom and 3 hydrogen (H) atoms.
2. Find the atomic masses of each element from the periodic table: nitrogen (N) has an atomic mass of approximately 14.01 g/mol, and hydrogen (H) has an atomic mass of approximately 1.008 g/mol.
3. Calculate the total mass contributed by nitrogen by multiplying the number of nitrogen atoms by its atomic mass: \$1 \times 14.01$ g/mol.
4. Calculate the total mass contributed by hydrogen by multiplying the number of hydrogen atoms by its atomic mass: \$3 \times 1.008$ g/mol.
5. Add the masses of nitrogen and hydrogen together to find the molar mass of ammonia: \$14.01 + (3 \times 1.008)$ g/mol.