Answer to Question #113405 in General Chemistry for Anastasia

Question

A sample of calcium chloride, CaCl2, contains 0.030 moles of chloride ions, Cl–. What is the total mass of the CaCl2 sample?

Answer 1

In CaCl₂ the chemical formula tells us that there are two moles of Cl^- in every mole of compound.

In our case there are 0.015 moles of CaCl₂.

M(CaCl₂)=110.98 g/mol

m = n×M

m(CaCl₂) = 0.015 mol × 110.98 g/mol = 1.6647 g

Answer: 1.66 g.