Question

If 150g of C8H18 is combusted what mass of water will be produced???
DrBob222
Start by writing the balanced equation.
2C8H18 + 25O2 ==> 16CO2 + 18H2O

Now just follow the steps in this stoichiometry example I've posted.
http://www.jiskha.com/science/chemistry/stoichiometry.html