# Question #fc45c

##### 1 Answer

Aug 21, 2017

#### Explanation:

The idea here is that you need to use the **molar mass** of sucrose to calculate the number of *moles* present in your sample.

You know that sucrose has a molar mass of **mole** of sucrose has a mass of

You want to go from *grams* to *moles*, so set up the molar mass of the substance as a conversion factor that has moles in the **numerator** and grams in the **denominator**.

You should end up with

#45.4 color(red)(cancel(color(black)("g"))) * "1 mole sucrose"/(342.3 color(red)(cancel(color(black)("g")))) = color(darkgreen)(ul(color(black)("0.133 moles sucrose")))#

The answer is rounded to three **sig figs**.