Question

What is the molar mass of benzene?

Answer 1

`78.114` `"g/mol"`

Explanation:

To find the molar mass of a compound, we first look at a periodic table to find the molar masses of each element in the compound:

![sciencenotes.org]()

The chemical formula for benzene is

`ul("C"_6"H"_6`

So we need only look at the values for carbon and hydrogen.

![cafepress.com]()

![cafepress.com]()

We find that the molar masses are

• `"C":` `12.01` `"g/mol"`

• `"H":` `"1.01` `"g/mol"`

We need to multiply these values by however many of each element there is in the compound, so we would then have

• `"C":` `12.011color(white)(l)"g/mol" xx 6 = color(red)(ul(72.066color(white)(l)"g/mol"`

• `"H":` `1.008color(white)(l)"g/mol" xx 6 = color(green)(ul(6.048color(white)(l)"g/mol"`

Finally, we add all the component elements up:

`color(red)(72.066color(white)(l)"g/mol") + color(green)(6.048color(white)(l)"g/mol") = color(blue)(ulbar(|stackrel(" ")(" "78.114color(white)(l)"g/mol"" ")|)`