[bssm14]

Hello.

I've attempted to work out this problem many times and each time my result does not match the recorded correct answer and I can't see where I've gone wrong.

"How many moles of oxygen are consumed in the complete combustion of an amount of C7H16S that produces 440 moles of sulfur dioxide among the combustion products CO2, H2O and SO2?"

First I balanced the equation.. C7H16S + 1202 = 7CO2 +8H20 + SO2

Then multiply number of moles of SO2 by the ratio 12/1.... 440*12=5280 moles of O2

However this answer does not match the recorded answer, where have I gone wrong?

Thanks.

[Borek]

5280 seems to be the correct answer.

[kimyacı]

 Maybe you can need to take accont in combustion of SO2

  SO2 + 1/2 O2 ----> SO3

[Borek]

Question explicitly named SO₂ as the product.