Question

What is the mass in grams of a 2. 65 mol sample of sodium phosphide, Na3P

Answer 1

264.841g Na3P

1) Find total mass of 1 mol Na3P:

3 × 22.99 (molar mass of Na) = 68.97g

1 × 30.97 (molar mass of P) = 30.97g

68.97g + 30.97g = 99.94g

2) Find mass in grams of 2.65 mol Na3P:

2.65 mol Na3P × (99.94g/1 mol) = 264.841g Na3P