11. Conservation of Mass,       Charge, and Energy   Previous PageNext Page
       Conservation of Mass in Chemical Reactions

The balanced equation indicates that each mole of propane gas burned requires five moles of oxygen. The problem as stated involved 1000g of propane, and the number of moles is

Five times this many moles of oxygen are needed:

The quantity of oxygen in grams then is

113.4 moles O2 x 32.00 g mole-1 = 3629 g O2

The entire calculation could have been set up in one step:

A single molecule of propane

Formula C3H8
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