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Answer the following problems showing all work.
1. An 8.20 gram piece of magnesium combines completely 5.40 grams of oxygen to form a compound. What is the percent composition of this compound?
2. What is the percent composition of sodium phosphate, Na3(PO4)1?
3. A 42.5 gram sample of a compound composed of carbon and sulfur was found to have 17.8 grams of carbon. What is the percent composition of this compound.
4. What is the percent composition of H2S1?
Answer:
1) 60.3% Mg, 39.7% O
2) 42.1% Na, 18.9% P, 39.0% O
3) 41.9% C, 58.1% S
4) 94.1% S, 5.9% H