Madison B.
asked • 01/13/20You react 2.0 g of O2 and collect 1.40 g of N2 gas. What is your percent yield?
N2H4+O2=N2+2H2O
partial answer: 7X.XX%
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2 Answers By Expert Tutors
Travis B. answered • 01/13/20
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J.R. S.
tutor
If your theoretical yield is calculated to be 1.75 g of N2, why did you use 1.77 g to calculate your percent yield?
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01/14/20
Travis B.
tutor
I used two significant figures for each of the calculations steps. Using 0.063 moles (2 significant figures being consistent with the original value), the grams of N2 would round to 1.77. In addition, since the partial answer provided has a percent of 7x.xx%, 1.77g would be more consistent with the answer requested.
It was an oversight on my part, and I appreciate you calling attention to it. I will strive to be aware and I thank you for bringing it to my attention.
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01/14/20
Moses I. answered • 01/13/20
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PhD-Chemistry Clinic managed by a patient chemistry addict (13 years).
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Stanton D.
Hi Madison, so convert these masses into moles (calculate molecular weights, as you need to), then compare with the stoichiometry in the balanced equation. Equations are always written in terms of moles (or, equivalently, as numbers of molecules which are reacting or being formed). -- Cheers, -- Mr. d.01/13/20