Question

A sample of ammonia, NH3, has a mass of 88.0088.00 g. Calculate the number of ammonia molecules in the sample.

Answer 1

3.118x10²⁴ ammonia molecules

Step-by-step explanation:

First we convert the mass of ammonia to moles, using its molecular weight:

Molecular weight of ammonia = 17 g/mol

• 88.00 g ÷ 17 g/mol = 5.176 mol

Then we convert moles into molecules, using Avogadro's number:

• 5.176 mol * 6.023*10²³ molecules / mol = 3.118x10²⁴ molecules