I need help in Chemistry please please

Question

Calculating Molar Masses of Compounds

Just add together the molar masses of all the elements in the compound (by Conservation of Mass). Distribute through the parenthesis when necessary.

1. MgCO3
2. (NH4)3PO4
3. Sn3(PO4)4

Answer 1

So, you do just what the instructions tell you to do. Use a periodic table and find the atomic masses of each of the elements that make up the compound of interest and add them together.

MgCO₃

Mg = 24.3

C = 12.0

O = 15.99 x 3 = 47.97

SUM = 24.3 + 12.0 + 47.97 = 84.3 g/mol = molar mass MgCO₃

(NH₄)₃PO₄

N = 14.0 x 3 = 42

H = 1.0 x 12 = 12

P = 31

O = 16 x 4 = 64

SUM = 42 + 12 + 31 + 64 = 149 g/mol = molas mass (NH₄)₃PO₄

Sn₃(PO₄)₄

Try it yourself and see if you get 736 g/mol