# Question 52037

Oct 21, 2016

molar mass of $N {a}_{2} \left(C {O}_{3}\right)$ = 106 grams/mole
The number of moles = 0.50 moles
The concentration is 0.50 moles/dm cubed

#### Explanation:

The molar mass of Sodium Carbonate can be found by multiplying the number of each atom times its atomic mass and adding all the masses together.

2 x Na = 2 x 23 = 46
1 x C = 1 x 12 = 12
3 x O = 3 x 16 = 48
+
Total = 106

The number of moles is the mass divided by the molar mass.

53/106 = 0.50 moles

The concentration is the number of moles divided by the volume so

0.50 moles / (${\mathrm{dm}}^{3}$)