Question

If a sample of pure cadmium has a mass of 18.2 grams, how many moles of cadmium are in the sample?

6.17 mol

112.4 mol

0.16 mol

2045.7 mol

Answer 1

Answer;

= 0.16 moles

Explanation;

1 mole of an element contains mass equivalent to its atomic mass.

The molecular mass of Cadmium is 112.411 g

Moles = mass in grams / molecular weight

Thus, the moles in 18.2 grams will be;

Moles = 18.2 / 112.411

= 0.161 moles

Answer 2

# of moles, n = mass in grams / atomic mass

Atomic mass of Cd = 112.4 g/mol

n = 18.2 g / 112.4 g/mol = 0.16 mol

Answer: 0.16 mol