Question

How many moles are in 300.1 g of ammonia, NH3? Be sure to show ALL work below!! (Hint: This question will require you to change grams to moles using molar mass, but you also need to calculate molar mass of the compound)

Answer 1

Answer: 17.62 g/mol

Explanation:

Data:

m = 300.1 g
compound: NH3 (the number 3 is a subscript)
n = ?

Formula:

n = mass in grams /  molar mass

Solution:

1) Calculate the molar mass

N: 14.007 g/mol
H: 3*1.008 g/mol
    -------------------
    14.007g/mol + 3*1.008g/mol = 17.031 g/mol

2) Calculate the number of moles

n = mass in grams / molar mass = 300.1 g / 17.031 g/mol = 17.62 mol

Answer: 17.62 mol