Homework Problem M11c

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Ashley Van Belle 2B
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Homework Problem M11c

Postby Ashley Van Belle 2B » Thu Sep 29, 2016 12:03 pm

For question M11c in the Chemistry Review section, the problem asks to find the mass of the excess reactant. I assumed that it would need to find the excess amount of phosphorous. However, when I looked at the solutions manual, it solves for the excess reagent of phosphorous(III) oxide. Why do I solve for phosphorous(III) oxide instead of phosphorous?

Luiza Karakhanyan
Posts: 6
Joined: Wed Sep 21, 2016 2:59 pm

Re: Homework Problem M11c

Postby Luiza Karakhanyan » Thu Sep 29, 2016 12:22 pm


If you read further it says, '...the oxygen can react further with phosphorus (III) oxide to produce phosphorus (V) oxide...' - so this is now another reaction, where oxygen reacts with an oxide (phosphorus (III) oxide) from the previous reaction, and not just phosphorus.
So in (c) it's asking you to calculate the excess reactant of the second reaction, rather than first.

Hope this helps!

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