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Fuel Combustion Question

So im stuck on parts e and f with this question.

https://ibb.co/YpXM6t2

I went about writing the complete combustion equations for propane and ethane

Then calculated the total mass of the two (352kg) and then found the mass (kg) of both ethane and propane with a 1kg basis (0.619kg ethane and 0.227kg propane).

Then found the moles of each by dividing the mass by the molecular weight of ethane and propane (20.6mol ethane and 5.155mol propane).

Then I found out the moles of O2 for both of the reactions, multiplying ethane moles by 3.5 and propane moles by 5.

I now have the total moles of O2=98moles and am stuck.

I thought if I found the mass of O2 in g and then divided by 21 and multiplied by 100 i would find the total theoretical air but this is wrong as I get an answer of 14.9kg.

Any help would be greatly appreciated.

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