Homework Help: Chemistry

Posted by Anonymous on Monday, May 9, 2011 at 1:42pm.

Ethane gas, or dicarbon hexahydride, undergoes combustion to produce carbon dioxide gas and water vapor.

A.) What mass of the un named reactant is required to react with 2.20 moles of ethane?

B.) How many molecules of the porduct, with the smaller percent composition of the non-oxide component, are produced if the reaction only goes 57.8 percent to completion?

Chemistry - DrBob222, Monday, May 9, 2011 at 3:36pm
A. Write and balance the equation.
2C2H6 + 7O2 ==> 4CO2 + 6H2O
2.2 moles C2H6 x (7 moles O2/2 moles C2H6) = ??moles O2.

B. I gave you the link for solving this problem earlier. You may not know what product is being discussed; you can calculate percent composition easily.
%C in CO2 = (12/molar mass CO2)*100= ??
%H in H2O = (2/molar mass H2O)*100 = ??

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