Question

Calculate the number of moles present in 646g of ammonia (NH3).

Answer 1

The Moles present in 646g of ammonia is 38 mol.

Step-by-step explanation:

Mole = mass of substance in grams/molecular mass of substance.

Molecular mass = 1 × ( atomic mass of N ) + 3 × ( atomic mass of H )

molecular mass = 14 + 3

= 17

Mole = 646 / 17

= 38 mol.