The molar mass of ammonia (NH3) is 17.04 g/mol. To calculate the number of moles in 12 x 10.3 grams of ammonia, we can use the formula:

Moles = Mass / Molar mass

Substituting the given values into the formula, we get:

Moles = (12 x 10.3) g / 17.04 g/mol

Moles = 7.48 mol

Therefore, there are 7.48 moles in 12 x 10.3 grams of ammonia.