Review worksheet from week 1, question 8  [ENDORSED]

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Husnia Safi - 1K
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Joined: Fri Sep 29, 2017 7:04 am

Review worksheet from week 1, question 8

Postby Husnia Safi - 1K » Thu Apr 12, 2018 9:30 pm

What mass of oxygen gas, O2, from the air is consumed in the combustion of 702g of octane, C8H18, one of the principal components of gasoline?
2C8H18 + 25O2 ----> 16CO2 + 18H20

Namie Fotion-1E
Posts: 31
Joined: Fri Apr 06, 2018 11:02 am

Re: Review worksheet from week 1, question 8  [ENDORSED]

Postby Namie Fotion-1E » Thu Apr 12, 2018 9:41 pm

start with the 702 grams of octane, multiply that by the molar mass of octane (in moles/grams so the units cancel out), then multiply by 25 moles of oxygen gas/ 2 moles of octane (this is directly from the balanced chemical equation), then multiply by the molar mass of oxygen in grams/moles so the moles cancel out and you are left with the mass of oxygen.


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