How many moles of oxygen O2 are needed for a complete combusion of two

1.	How many moles of oxygen O2 are needed for a complete combusion of two moles of butane C4H10?
Answer» ong>ANSWER: $\frac{13}{2}$ mole NEEDED Explanation: to complete combustion of an alkane 3N + 1 /2 *moles* *oxygen* needed ( n ) is *the* no of *CARBON* *atoms* in *alkane* *butane has* 4 so 13/2 *need*ed