help! GC topscore question!!!

[JustwantDDS]

ok- i understand up to finding the 40% of M

then wth is the rest
an ICE table i assume.......... can someone explain/show set up please?!?!?!?! my brain hurts

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[LetsGo2DSchool]

Hey, I just got this problem wrong too a little while ago, but now understand the solution.

It's an ICE setup:

Initial:
PCl5: 4.750 M
PCl3: 0 M
Cl2: 0 M

Change:
PCl5: -1.896 M
PCl3: +1.896 M
Cl2: +1.896 M

Equilibrium:
PCl5: 4.750 - 1.896 = 2.854 M
PCl3: 1.896 M
Cl2: 1.896 M

PCl5 <---> PCl3 + Cl2

Kc = [PCl3][Cl2] / [PCl5]
Kc = (1.896)(1.896) / 2.854
Kc = (1.896)^2 / 2.854

 

[JustwantDDS]

thank youuuuuuuuuu
how r we supposed to do this w/o a calc errrrrrrrrrrrrrgh