Posted by Anonymous on Monday, March 26, 2012 at 10:52am.
You can do this the long way or the short way. The long way is
1. Write the equation and balance it.
2. Convert L CH4 to mols CH4 using PV = nRT.
3. Using the coefficients in the balanced equation, convert mols CH4 to mols H2O vapor.
4. Using PV = nRT convert mols H2O vapor to volume.
The short way:
1. Write and balance the equation.
CH4 + 2O2 ==> CO2 + 2H2O
2. Use L directly with the coefficients in the balanced equation. As long as the equation deals with gases and there is no P or T difference between start and finish, there is no need to go through the middle steps.
8.4 L CH4 x (2 mols H2O/1 mol CH4) = 8.4 x 2 = 16.8 L H2O vapor.
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