Question

A `10*g` mass of carbon dioxide is obtained from the combustion of a `70.2*g` mass of octane. What is the apparent yield?

Answer 1

We interrogate the stoichiometric combustion equation..............and the yield is under 5%.

Explanation:

`C_8H_18(l) + 25/2O_2(g) rarr 8CO_2(g) + 9H_2O(l)`

`"Moles of octane"=(70.2*g)/(114.23*g*mol^-1)=0.614*mol`

`"Yield of carbon dioxide"=(10.0*gxx100%)/(8xx0.614*molxx44.01*g*mol^-1)=??%`

Are sure you've copied down the appropriate data? The yield seems a little low.