Sample Problem 2.13
Calculating the Molecular Mass of a Compound
SOLUTION:
(a) tetraphosphorous trisulfide
(b) ammonium nitrate
PLAN:
Write the formula and then multiply the number of atoms in the subscript by the respective atomic masses. Sum the masses.
= (4 x atomic mass of P)
+ (3 x atomic mass of S)
= (4 x 30.97 amu) + (3 x 32.07 amu)
= 220.09 amu
= (2 x atomic mass of N)
+ (4 x atomic mass of H)
+ (3 x atomic mass of O)
= (2 x 14.01 amu)+ (4 x 1.008 amu) + (3 x 16.00 amu)
= 80.05 amu
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