Question

salt gave the following percentage composition of magnesium 9.76% sulphur 31.01 % oxygen 26.01 % H2O 51.22% calculate its empirical formula

Answer 1

Mg S O H2O
9.76. 31.01 26.01 51.22
÷24.31. ÷32.06. ÷16. ÷18
0.4. 0.97. 1.63. 2.85
÷0.4. ÷0.4. ÷0.4. ÷0.4
1. 2. 4. 7

=MgS2O4.7H2O