Question

What is the mass of 7. 80 moles of magnesium chloride,

MgCl2?

Express your answer with the appropriate units.

Answer 1

Answers:

n = mass/Mr

mass = n × Mr

Hence , mass = 7.8 × 95

= 741 grams

Answer 2

The mass of MgCl2 is 743g/mol with the correct number of significant figures.