Question

Calculate the number of moles in 2.2 grams of niacin?

Answer 1

`0.018"mol"`

Explanation:

The formula for moles is `n=m/M`, where `m` is the mass and `M` its molar mass.

Here, `m=2.2"g"`. The molar mass of niacin is `123.11"g/mol"`, so we input:

`n=2.2/123.11`

`n=0.018"mol"`