What is the molar mass of calcium?

1 Answer
Mar 19, 2018

Answer:

#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"#.