The combustion of Ammonia in the presence of?

Question

excess oxygen yields N02 and H2O:
4NH3 (g) +7O2(g)-->4NO2(g) +6H2O(g)
The combustion of 28.8 of ammonia consumes___g of oxygen.
a. 94.9
b.54.1
c.108
d.15.3
e.28.8

Answer 1

a. 94.9

Answer 2

Need some calcs. Divide 28.8 by 17 to get the moles of ammonia you have. Since the reaction shows that you need 7 moles of oxygen to react with 4 of ammonia, multiply the ammonia moles by 7/4 and then multiply by 32, the weight of O2.
Answer a looks closest.

Answer 3

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RE:
The combustion of Ammonia in the presence of?
excess oxygen yields N02 and H2O:
4NH3 (g) +7O2(g)-->4NO2(g) +6H2O(g)
The combustion of 28.8 of ammonia consumes___g of oxygen.
a. 94.9
b.54.1
c.108
d.15.3
e.28.8

Answer 4

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Find moles of NH3, use the stoichiometric ratio of NH3 to NO2, in this case 4:4 or 1:1 simplified, to find moles of NO2 Find grams of NO2 using it's molar mass