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1-How many grams of P2O5 are required to supply 46.5 grams of phosphorus? 2-What is the...

1-How many grams of P2O5 are required to supply 46.5 grams of phosphorus?

2-What is the empirical formula weight of Na2S2O8?

3-When 5.00 grams of copper is burned with sulfur, it gives a product that weighs 6.26 grams. What is the formula of copper sulfide CuxSy ?

3-A compound of carbon and hydrogen has 85.7% C and 14.3% H. The molecular weight of the compound is 70.0 g/mol. Determine the molecular formula of the compound.

4-What is the empirical formula of a compound that has an elemental ratio of 1.00 mole C to 2.67 molH ? [a]

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