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Q: Chemistry Homework Question ( No Answer,   1 Comment )
Question  
Subject: Chemistry Homework Question
Category: Science > Chemistry
Asked by: gotmike-ga
List Price: $3.00
Posted: 18 Apr 2005 19:01 PDT
Expires: 18 May 2005 19:01 PDT
Question ID: 511133
I am having problems finding the mass of acrylonitrile, and the mass
of water, produced from a mixture of 1.15 kg of propylene, 1.90 kg of
ammonia, and 2.32 kg of oxygen.
2C3H6 + 2NH3 + 3O2 --> 2C3H3N + 6H20

I am looking for someone who can explain the steps of aproaching the
answer and the correct answer and what I may have done wronge when I
got the answer 874.56.
Answer  
There is no answer at this time.

Comments  
Subject: Re: Chemistry Homework Question
From: xarqi-ga on 19 Apr 2005 02:02 PDT
 
OK - first check the equation is balanced - it is.

Now get some MW figures:
propylene = 42.08; ammonia = 17.03; oxygen = 16.00; acrylonitrile =
53.06; water = 18.02

We have 1150/42.08 = 27.33 mol of propylene, 1900/17.03 = 111.57 mol
of ammonia, and 2320/16.00 = 145.00 mol of oxygen available to react. 
Clearly the propylene is the limiting reactant.

27.33 mol of propylene will produce 27.33 mol of acryonitrile with a
mass of 27.33 x 53.06 = 1450g, and 27.33 x 3 = 81.99 mol of water with
a mass of 81.99 x 18.02 = 1477g

A reality check shows we are getting about 2900g of product from 5370g
of material, and some were in considerable excess, so the answer is
not obviously wrong.

I can't say where you went wrong.

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