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- anonymous

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%?
how many grams of zinc are needed to produce 112 l of H2 at STP?
a. 95 g
b. 180
c. 280
d.380
Okay, I got the formula for this. I got that if it was 100% yield I would need 277.95 grams. So what do I do with the 85% yield?
The answer is D btw. I just multiplied 277x0.85.. but that doesn't work...

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- anonymous

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- anonymous

Wait, I got it. It's cuz actual yield/theoretical yield=percent yield therefore.
277/0.85.
KK

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