Joey O.

asked • 08/22/14

Chemistry Problems

1.) Elemental phosphorus reacts with chlorine gas according to the equation:
P4(s)+6Cl2(g)→4PCl3(l)
A reaction mixture initially contains 45.09g P4 and 131.1g Cl2.
 
Once the reaction has occurred as completely as possible, what mass (in g) of the excess reactant is left?
 
 
 
2.) Iron(II) sulfide reacts with hydrochloric acid according to the reaction:
FeS(s)+2HCl(aq)→FeCl2(s)+H2S(g)
A reaction mixture initially contains 0.214mol FeS and 0.664mol HCl.
 
Once the reaction has occurred as completely as possible, what amount (in moles) of the excess reactant is left?

3 Answers By Expert Tutors

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Alex D. answered • 08/22/14

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Phillip R.

this reaction requires P in gaseous state so P4 is correct, the (s) should be (g)
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08/22/14

Alex D.

ty....noticed after...lol
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08/22/14

Harvey F.

tutor
White phosphorus is a tetrahedral structure with 4 P atoms, therefor P4 is suitable as the formula for solid phosphorus. (See Wikipedia on "Phosphorus")
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08/22/14

Phillip R. answered • 08/22/14

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Top Notch Math and Science Tutoring from Brown Univ Grad

Emily W.

you explain it better than my own "professor".....thank you
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03/08/19

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