Consider the unbalanced equation for the combustion of hexane:
2C6H14(g)+19O2(g)→12CO2(g)+14H2O(g)

Determine how many moles of O2 are required to react completely with 7.9 moles C6H14.





Answer :

ratio of C6H14 to O2 
2:19 
2/19=7.9/x
solve for x and youre done!!