Please help solve these chemistry questions!!!
Practice with percent composition.
1. What is the percent composition of Fe if 111.7 g of Fe is recovered from a 159.7 g sample of Fe2O3?
2. What is the percent composition of O if 12 g of O is recovered from a 38 g sample of Cr2O3?
3. Calculate the percent composition of KCl.
4. Calculate the percent composition of N2O5.
Practice with empirical formulas
5. What is the empirical formula for a compound that contains 0.0260 mol C, 0.0325 mol H, and 0.0065 mol O.
Practice with Molecular Formulas
6. Determine the molecular formula for a compound that has an empirical formula of NO2 and a molar mass of 138.015 g/mol.
7. Nicotine is 74.1% C, 8.6% H, and 17.3% N by mass. It’s molar mass is about 160 g/mol.
a. What is it’s empirical formula?
b. What is it’s molecular formula?
