Help in equillibrium problem with directon of net change

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SUMMARY

The discussion centers on calculating the reaction quotient (Qp) for the equilibrium reaction CO(g) + 3H2(g) ⇌ CH4(g) + H2O(g) at 773K, with Kp = 102. The user initially calculated Qp to be 420,000, which is incorrect. The correct Qp is determined to be 98.4, indicating a slight net reaction to the right, as Qp is less than Kp. The user struggles with the proper calculation of Qp, particularly in applying the correct values for partial pressures instead of molarity.

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Homework Statement



The following amounts of substances are added to a 7.25 L reaction vessel at 773K:
(.103 mol CO) , (.205 mol H2), ( 2.1 mol CH4), ( 3.15 mol H20). In what direction will a net reaction occur to react equilibrium.

CO(g) + 3H2(g) --------> CH4(g) + H20 (g)
<-------

Kp= 102 at 773K

The answer to this problem is a slight net reaction occurs to the right because QP (98.4) is slightly less than Kp (102)

The problem i have is everytime i try to do the work i can't get the Qp to = 98.4

If someone will help me i will be very greatful

Homework Equations





The Attempt at a Solution



here is my attempt sry i forgot to post it

first i put all the moles in molarity and got the folloying
CO--- .42 M
H2--- .28
CH4--- .014
H2) --- 2x10-5 when you cube it cause of the coefficient

Then i put a Qp equation

Qp= ( .42)(.28)
--------------------
------( .014)(2e-5)

Final answer i got was Qp= 420000 way off i can't figure out why
 
Last edited:
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The reaction quotient (Qp) in this case refers to the partial pressures of each of the species (rather than molarity). I believe the exponent for each of the partial pressures if given by the mole fraction of each species.
 

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