The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9 % phosphorus and 39 % oxygen. Find the empirical formula of the compound[Na = 23, P = 31, O = 16].
Na3PO3
NaPO4
Na2PO4
Na3PO4
A
NaPO4
B
Na3PO4
C
Na3PO3
D
Na2PO4
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Solution
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Element
Percentage composition
Atomic weight
Relative No. of atoms
Simplest ratio
Sodium
42.1
23
42.1/23 = 1.83
1.83/0.61 = 3
Phosphorus
18.9
31
18.9/31 = 0.61
0.61/0.61 = 1
Oxygen
39.0
16
39.0/16 = 2.44
2.44/0.61 = 4
Thus empirical formula is Na3PO4.
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The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9 % phosphorus and 39 % oxygen. Find the empirical formula of the compound[Na = 23, P = 31, O = 16].
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