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September 30, 2014

Homework Help: chem/some1 check my work plz.

Posted by julia on Tuesday, November 16, 2010 at 7:23pm.

2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g)

if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the % yield of nitrogn gas??

please check if is correct....
A)
18.1gNH3(1 mol NH3/17.03gNH3)(1molN2/2molNH3)= .053 mol N2

90.4gCuO (1molCuO/79.55gCuO) (1molN2/3molCuO)= .379N2, so CuO is the L.R.
B)
0.379molN2 x 28.02gN2/1mol N2= 10.62gN2, ***so, 10.62g N2 is the theoretical yield.
C)
8.52gN2/10.62gN2 x 100= 80.2% yield of N2
please check if I'm doing this problem correct...thankx...

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