To calculate the molar mass of three moles of ammonia molecules (NH3), you need to sum up the atomic masses of the constituent atoms.
The molar mass of ammonia (NH3) can be calculated as follows:
Molar mass of NH3 = (Number of moles of N * Atomic mass of N) + (Number of moles of H * Atomic mass of H)
Given: Atomic mass of N (Nitrogen) = 14 g/mol Atomic mass of H (Hydrogen) = 1 g/mol
Number of moles of N = 3 moles Number of moles of H = 3 moles (since there are three hydrogen atoms in each ammonia molecule)
Molar mass of NH3 = (3 moles * 14 g/mol) + (3 moles * 1 g/mol) = 42 g + 3 g = 45 grams
Therefore, the molar mass of three moles of ammonia molecules (NH3) is 45 grams.