Fomula mass of chemical compound

Q. Calculate the formula mass of the compounds KBr and \( NH_4CN\)

A. The atomic masses of K and Br are respectively 39.102 and 79.904 respectively. Thus the formula mass is 39.102+79.904= 119.006 amu.

On the other hand, NH4CN has a formula mass calculated in the following table:

Component	Amu	Total
N	14.00671	14.0067
H4	1.008(4)	4.032
C	12	12
N	14.0067	14.0067
Total		44.107

The formula mass is then 44.107.