Chem

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I have a few questions, if anyone can help me at all it would be amazing. i need this done by TOMORROW (03/03/2008)

1. Cyanogen has been observed in the atmopshere of Titan, Saturn's largest Moon, and in the gases of the interstellular nebulas. On Earth, it is used as a welding gas and a fumigant. In its reaction with floruine gas, carbon tetrafluroide and nitrogen trifluroride are produced. What mass of carbon tetrafluoride forms when 80.0 grams of each reactant are mixed?

2. An Element "X" has a triiodide with a formula of XI3 (the 3 should be subscript) and a trichloride with a formula of XCL3. The triioidide is quantitantively converted to the trichloride when it is heated in a stream of chlorine, according to the equation:
2XI3 + 3CI2 -> 2XCI3 + 3I2

If 0.8000 grams of XI3 ius treated, 0.3776 grams of CLI3 is obtained.

a.) Calculate the atomic mass of the element X

b.) Identify the element X

3. Hydrogen gas has been suggested to clean fuel because it produces only water vapor when it burns in the presence of O2. If the reaction has a 98.8% reaction yeild, what mass of hydrogen forms from 85.0 grams of water?

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