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September 2, 2014

Homework Help: chemistry

Posted by jason on Friday, November 7, 2008 at 11:34pm.

Calculate the number of grams of reactant left over when 28.35 grams of silver reacts with 50.0 liters of air at STP which is 20.9476 % oxygen by volume. The density of air at STP is 1.292 g/L.
attemt at a solution:
m = dv = 64.6 g of air
moles silver =28.35/108=0.26
moles of air : n= PV/RT = (1atm)(50L)/(.0821)(298K)=2mol
moles of air left= 2 - 0.26 =1.74 mol

iam stuck on this need some help please

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