1. In an experiment, 0.25 grams of iron and 0.25 grams of sulfur are heated in a test tube to create a new
substance. What is the percent composition by mass of each element in the new compound?
2. A chemist breaks down a compound into 3.4 grams of carbon and 6.8 grams of oxygen. What is the percent
composition by mass of each element in the compound?
3. In an experiment, 2.0 g of oxygen reacts with 80.1 g of calcium to form a new compound. What is
the percent composition by mass of each element in the new compound?
4. What is the percent composition by mass for each element in lithium phosphate, Li3PO4?
5. What is the percent composition by mass for each element in iron (III) carbonate, Fe2(CO3)3?