# How do you determine the mass of 5.20 moles of C_6H_12 (gram-formula mass = 84.2 grams/mole)?

Mar 26, 2018

The mass of $\text{5.20 mol C"_6"H"_12}$ is $\text{438 g C"_6"H"_12}$.

Refer to the explanation for the process.

#### Explanation:

Divide the given moles by the molar mass of the compound. I prefer to do this by multiplying by the inverse of the molar mass, since it is a fraction. I believe it's easier to see what happens with the units.

5.20color(red)cancel(color(black)("mol C"_6"H"_12))xx(84.2"g C"_6"H"_12)/(1color(red)cancel(color(black)("mol C"_6"H"_12)))="438 g C"_6"H"_12" (rounded to two significant figures)

The mass of $\text{5.20 mol C"_6"H"_12}$ is $\text{438 g C"_6"H"_12}$.