Having the toughest time with this chemistry question

[Xylitol]

A mixture of .10 mol of NO, .050 mol of H2, and .10 mol of H2O is placed in a 1.0-L vessel at 300 K. The folloowing equilibrium is established:
2NO(g) + 2H2(g) <-> N2(g) + 2H2O (g)

At equilibrium PartialPressureNO = 1.53 atm

Calculate the equilibrium partial pressures of H2, N2, and H20

The answer is in the back of the book, but I dont know how they got that answer
Help is appreciated

 

[atomicacid55]

Molar ratios... then you use equilibrium constant stuff. Sum of partial pressures also equals total pressure. Blah blah. You get it. Multiple equations, multiple variables. Voila!

 

[KLin]

http://school.discovery.com/homeworkhelp/bjpinchbeck/bjscience.html

 

[Xylitol]

Originally posted by: atomicacid55
Molar ratios... then you use equilibrium constant stuff. Sum of partial pressures also equals total pressure. Blah blah. You get it. Multiple equations, multiple variables. Voila!

Whats the total moles
.3 moles right
So mole fraction for say... H2 would be .5/.3 right?

 

[TheChort]

first figure out how many moles of NO produces 1.53 atm
once you have that, use the mole ratio of the equation to figure out how many moles of H2 you have as well. (that will give you the atm for H2)

but for N2 and H2O, you can't use the same work (well, not right away at least). Let me just say there is some adding/subtracting involved.

 

[Oil]

Using an ICE table would be the easiest if you were taught that method

 

[imported_quasi]

Taking AP Chem? We just started equilibrium a few days ago.

At equilibrium, the partial pressure of NO is 1.53 atm, so with PV=NRT, you can determine the number of moles. (.062)

Then set up an ICE table (Initial, Change, Equilibrium) for the reaction. Because the change in NO was -.038 mol, H2 should be -.038 mol change, N2 should be .019 mol change and H20 should be .038 change. Then just use PV=NRT to convert to pressure

Final equilibrium concentration and partial pressure:
H2 = .012 mol = .30 atm
N2 = .019 mol = .47 atm
H20 = .138 mol = 3.4 atm

It makes sense in my head, but I may have gone wrong in several places.

 

[thecoolnessrune]

When do they teach that stuff? In my curriculum we were taught that last year (11th grade).

 

[dudeman007]

Originally posted by: KLin
http://school.discovery.com/homeworkhelp/bjpinchbeck/bjscience.html

bj science eh?

 

[imported_quasi]

Originally posted by: thecoolnessrune
When do they teach that stuff? In my curriculum we were taught that last year (11th grade).

AP Chem here, either as a Junior or Senior. (I'm a Junior)

 

[KLin]

Originally posted by: dudeman007

Originally posted by: KLin
http://school.discovery.com/homeworkhelp/bjpinchbeck/bjscience.html

bj science eh?

The only thing missing is a steak dinner. :laugh: