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November 01, 2025, 01:00:34 pm
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Author Topic: Excess and limiting reactant problem?  (Read 873 times)  Share 

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jaydee

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Excess and limiting reactant problem?
« on: October 28, 2011, 11:03:00 pm »
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Im having a dispute with friends about this question

4HCl(g) + O2(g) --> 2H2O(l) + 2Cl2 (g)
All gases are measured at constant temperature and pressure.
If 40.0 mL of HCl reacts with 30.0 mL of O2 which gas is in excess and by how much? What is the volume of the final gaseous mixture?

My answer was 20.0mL of O2 in excess and 20.0mL of Cl2 gas giving 40.0mL in total. anyone else agree? two of my friends said 60.0mL...
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vea

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Re: Excess and limiting reactant problem?
« Reply #1 on: October 28, 2011, 11:07:20 pm »
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40mL of HCl reacts with 10mL of O2 because of the ratio 4:1 and the fact that they are both gases measured at constant temp and pressure.

So there is 20mL excess of O2 and 20mL of Cl2 is formed.

You seem to be right!
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jaydee

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Re: Excess and limiting reactant problem?
« Reply #2 on: October 28, 2011, 11:09:41 pm »
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ok! thanks i just needed reassurance since its unusual for 2 of my friends (both are really smart) to have a wrong answer :S
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2011  Psychology [45] Chinese SL [30]
2012 English [40], Math Methods[47], Specialist Maths[41], Chemistry[42], Physics[39]
ATAR 99.15
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