What is the molar mass of H_2CO_3?

1 Answer
Mar 11, 2016

It is 62.03 g/(mol).

Explanation:

To find molar mass, multiply the molar mass of each atom by the number of that type of atom and then add the masses. I have done it in detail here showing units.

The molar mass is the mass in grams of 1 mol of a substance. H_2CO_3 has 2 atoms of H, 1 atom of C, and 3 atoms of O. So 1 mole of it has 2 mol H, 1 mol C, and 3 mol O. The mass of one mole of an atom is the molar mass in g/(mol) on the periodic table. So the molar mass is:

2 mol H* (1.01\ g\ H)/(mol\ H_2CO_3)= (2.02\ g\ H)/(mol\ H_2CO_3)

1 mol C* (12.01\ g\ C)/(mol\ H_2CO_3)= (12.01\ g\ C)/(mol\ H_2CO_3)

3 mol O* (16.00\ g\ O)/(mol\ H_2CO_3)= (48.00\ g\ O)/(mol\ H_2CO_3)

(2.02\ g\ H)/(mol\ H_2CO_3)+(12.01\ g\ C)/(mol\ H_2CO_3)+(48.00\ g\ O)/(mol\ H_2CO_3)=(62.03\ g\ H_2CO_3)/(mol\ H_2CO_3)