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...

chem/some1 check my work plz. - DrBob222, Tuesday, November 16, 2010 at 7:34pm
You made a typo for A, it should be 0.053.

For B, I used 28.01 for molar mass N2 and obtained an answer of 10.61 for g N2.
Then 8.52/10.61 *100 = 80.28 which I rounded to 80.3.
Your method is fine. My source for molar mass may be incorrect. I didn't add all of those number myself. Here is the site I used.
http://environmentalchemistry.com/yogi/reference/molar.html#Calculator
chem/some1 check my work plz. - bobpursley, Tuesday, November 16, 2010 at 7:38pm
a. OK, except the decimal is wrong, typo
b. ok
c. correct.
chem/some1 check my work plz. - julia, Tuesday, November 16, 2010 at 8:09pm
Thank u!!!!

Answer this Question

Related Questions

chem - consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+...
chem - consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+...
chem/DrBob22 - consider the following balance chemical equation: 2NH3(g)+3CuO(s...
chem - consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+...
Chemistry - ammonia gas reacts with copper (ii) oxide at high temperatures to ...
Chemistry - Hydrogen gas, , reacts with nitrogen gas, , to form ammonia gas, , ...
chemistry - Name a reagent that will react with a) copper(II)hydrooxide and ...
Chemistry - Copper metal reacts with concentrated nitric acid according to the ...
CHEMISTRY - hydrogen reacts with nitrogen to produce ammonia. 3H2(g)+ N2(g) = ...
Chem hwk - Using the equation N2 + 3H2 yields ==> 2NH3 , determine how ...

For Further Reading

First Name:
School Subject:
Answer: