General Chem question

[i4everpaki]

when 14.250 moles of PCl5 gas is placed in a 3.0 liter container and comes to equilibrium at a constant temperature, 40.0% of the PCl5 decomposes according to the equation:

PCl5 -> PCl3 + Cl2

What is the value of Kc for this reaction?

the ans is (1.896)^2 / 2.8545

- i have no idea how to solve this. initially i was thinking ice chart but we do not have enough information.
- the only thing i derived at was finding amount of PCl5 dissociates
14.250 / 3 = 4.750M x .40 = 1.896M
- From this part i have no idea what to do.
- i know Kc = (product)^2 / Reactant.
any help and explanation plz.

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[CANgnome]

ice would have helped.

the 2.85 is the 60% of the reactant Pcl5 that has not decomposed.

you are right on for every step, just forgot a little detail.

 

[i4everpaki]

if you dont mind, can you give me more details. step by step plz

 

[i4everpaki]

nvm figured it out. i feel so dumb lol