9. P2O5 Percent to mass P 43.64 %43.64g O 56.36%56.36g Mass to mole
P 43.64g/30.97g/mol
O 56.36g/16.00g/mol
Divide by small
P 1.41mol÷1.41=1
O 3.52mol÷1.41=2.5
Multiply til whole
P 1 x2 =2
O 2.5x2 =5
P2O5

11. C3H8O Already whole Percent to mass C 60.0 %60.0g H 13.4%13.4g
O26.6%26.6g
Mass to mole
C 60.0g÷12.0g/mol
H 13.4g÷1.008g/mol
O 26.6g÷16.00g/mol
Divide by small
C 5÷1.7
H 13.3 ÷1.7
O 1.7÷1.7
Multiply til whole
C 2.9~3
H 8
O 1
Already whole
C3H8O

13. 1. A sample of indium chloride weighing g is found to contain g of chlorine. What is the empirical formula of the indium compound?

14. 2. Analysis of a 20.0g sample of a compound containing only calcium and bromine indicates that 4.00g of calcium are present. What is the empirical formula of the compound formed?

15. 4. A 15. 0g sample of a compound is found to contain 8
4. A 15.0g sample of a compound is found to contain 8.83g sodium and 6.17g sulfur. Calculate the empirical formula of this compound.

16. 3. Rubbing alcohol was found to contain 60.0 % carbon, 13.4 % hydrogen, and 26.6 % oxygen. What is the empirical formula of rubbing alcohol?