Answer to Question #260965 in Organic Chemistry for Fariha

Question

9. By mass, a compound contains 28.9% potassium, 23.7% sulfur and the remainder is oxygen. What is the empirical formula of this compound? 

10. The percent compositions are given for 2 antibiotics below. Find the empirical formula for each one:

a.  40.87% carbon, 3.72% hydrogen, 8.67% nitrogen, 24.77% oxygen and 21.98% chlorine.

b.  41.86% carbon, 4.65% hydrogen, 16.28% nitrogen, 18.60% oxygen and 18.60% sulfur.

11. Caffeine consists of 49.5% carbon, 5.15% hydrogen and 28.9% nitrogen and the rest is oxygen.

a. What is the empirical formula?

b. Given the molar mass of caffeine is 195g/mol, what is the molecular formula?

12.  An ester is a compound with a pleasant odour. One of the esters was analyzed and the data is found below:

Answer 1

Empirical formula =KSO4

Emprical Formula =CH2NOCl2