Question

Ammonia (NH3) is commonly used in household cleaners. If there were 5.31 × 1023 molecules of NH3, what was the mass of ammonia in grams? ____________ g NH3. Do NOT enter unit in your answer. Report your answer with 3 SFs.

Answer 1

since 1 mole = 6.023*10^23 molecules, you have
5.31/6,023 = 0.8816 moles
Now multiply that by the mol wt of NH3, which is approximately 14+3=17
0.88*17 = ___ grams