To determine the number of moles of ammonia (NH3) in 31.7 g of the compound, we need to use the formula:
moles = mass / molar mass
1. First, we need to find the molar mass of ammonia (NH3).
The molar mass is calculated by adding up the atomic masses of each element in the compound. The atomic masses are found on the periodic table.
The molar mass of nitrogen (N) is approximately 14.01 g/mol, and the molar mass of hydrogen (H) is approximately 1.01 g/mol.
To find the molar mass of ammonia (NH3), we multiply the molar mass of nitrogen by 1 (since there is only one nitrogen atom) and the molar mass of hydrogen by 3 (since there are three hydrogen atoms).
Molar mass of NH3 = (1 x molar mass of N) + (3 x molar mass of H)
= (1 x 14.01 g/mol) + (3 x 1.01 g/mol)
= 14.01 g/mol + 3.03 g/mol
= 17.04 g/mol
So, the molar mass of ammonia (NH3) is approximately 17.04 g/mol.
2. Now, we can calculate the number of moles of ammonia using the formula:
moles = mass / molar mass
moles = 31.7 g / 17.04 g/mol
moles ≈ 1.86 mol
Therefore, there are approximately 1.86 moles of ammonia (NH3) in 31.7 g of the compound.