# Chemistry

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1) Consider the formation of sulfur trioxide according to the reaction:

2 SO2(g) + O2(g) -> 2 SO3(g) delta H = -198

How much heat is evolved in the formation of 750 grams of SO3?

I am not sure how to start this problem.

• Chemistry -

193 x (750/2*molar mass SO3) = ?

• Chemistry -

So I did 193 X (750/2*80.0642) = 904.

The answer choices given are 10.6, 928, 1.86 X 10^3, 7.43 X 10^4, 3.71 X 10^3

And how did you get 193?

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