Practice Problems 2
1. Calculate the unit formula mass of lead nitrate Pb(NO3)2
[Pb
207; N = 14; O = 16]
[Na = 23; C = 12; O = 16; H = 1] 12
3. Calculate the unit formula mass of ammonium phosphate INH.
,
IN
14; H = 1; P = 31; O = 16]
th
.
24
erical Problem 3
g sample of a compound of oxygen and boron was found to contain
3 of oxygen. Calculate the percentage composition of compound by me
Mass of boron
X100
Mass of compound
0.144
Mass percentage of oxygen
x 100 = 60%
0.24
0.096
0.24
78 + 128 + 54 + 640 + 48 = 948 amu.
2. Calculate the unit formula mass of hydrated sodium carbonate. Na,
on : Mass percentage of boron
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