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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]. A N a 3 ​ P O 3 ​ B N a P O 4 ​ C N a 2 ​ P O 4 ​ D N a 3 ​ P O 4 ​

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].

A

Na3​PO3​

B

NaPO4​

C

Na2​PO4​

D

Na3​PO4​

Grade:12th pass

1 Answers

Mayank Ranka
askIITians Faculty 277 Points
3 years ago

 

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 Na3​3PO44​.

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