Question

What is the molar mass of calcium?

Answer 1

`40 \ "g/mol"`.

Explanation:

On the periodic table, it shows us that calcium has a mass of around `40 \ "amu"`.

We now need to convert from `"amu"` to `"g/mol"`.

We know that the mass of one mole of carbon-12 atoms is `12 \ "g"`, or,

`1 \ "mol"*m_(""^12C)=12 \ "g"`, because of the definition of the mole.

And so, we get, `m_(""^12C)=12 \ "g/mol"`.

Meanwhile, one carbon-12 atom has a mass of exactly `12 \ "amu"`, i.e. `m_(""12^C)=12 \ "amu"`.

So, we have found out that

`12 \ "g/mol"=12 \ "amu"`

or

`1 \ "g/mol"=1 \ "amu"`

Source: https://chemistry.stackexchange.com/questions/13764/amu-and-g-mol-relation

Now, a calcium atom has a mass of `40 \ "amu"`.

So, the molar mass of calcium would be `40 \ "g/mol"`.