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Stoichometry of chemical equations

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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Category:- Chemistry
Reference No.:- M9409094

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