Chemistry Homework Solutions
Problem
#44257

Equation for complete combustion e.g. butane

My chemistry book asks the question:  

Write the balanced equation for the complete combustion of each of the following compounds:

a.  ethane, C2 H6  

The book has the answer which reads:

2C2h6 + 7O2     I don't understand where the formula for 7 02


b.  cyclopropane

    I understand the formula C3H10 but I don't understand the "addition" of a 2 in front - and where the number for the oxygen comes in.  
Answer says:  2C3H6 + 9 02

The book only gives the answer but does not explain specifically the math.  

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