My honors chem teacher gave us a sheet with some challenge problems we need to do. here are a few i need help with (they are from the AP Text book, supposedly).
1. A compound has an empirical formula of C3H5"X"3. a 7.000g sample was determined to be 0.04751 mol of the compound. What element is "X"? (I got Chlorine, I'd appreciate it if someone checked it out though)
2. An unkown compound contains only carbon and hydrogen (a hydrocarbon). Complete combustion of a sample of this compound produced 2.641 g of carbon dioxide and 1.442 g of water as the only products. Find the empirical formula of the compound. Its molar mass is 44 g/mol. What is its molecular formula? (For the emp formula i got H2C, and for the molecular formula i got H6C3)
3. You have a mixture that contains sodium chloride (NaCl) and sodium chlorate (NaClO3). You want to determine what % of the mixture is sodium chlorate. You heat a 8.762 g sample of the mixture intensely in a crucible causing the sodium chlorate to decompose into sodium chloride and oxygen gas. The oxygen escapes from the crucible. The sodium chloride in the original mixture does not react. The mass of the solid in the crucible after the reaction is 6.503 g (this is the original NaCl and the NaCl produced from the reaction.) What was the % of sodium chlorate in the original mixture?
4. An unknown compound contains C, H, and O. Complete combustion of a 10.68 g sample of this compound produced 16.01 g of carbon dioxide and 4.37 g of water as the only products. Find the empirical formula of the compound. Its molar mass is 176.1 g/mol. What is its molecular formula?
Thanks guys