Question

What amount (moles) is represented by each of these samples?a. 150.0 g Fe2O3b. 10.0 mg NO2c. 1.5 3 1016 molecules of BF3

Answer 1

To find the amount represented by the given sample, we have to use the molecular mass of Fe2O3, which is 160g/mol approximately.

$150.0g\cdot\frac{1mol}{160g}=0.9375mol$

The answer is 0.9375 moles of Fe2O3.