Sapling Week 1 #4

[Zoe FC 1C]

Hi,

Could someone help me out on how to solve this one? I'm not quite sure what to do with the initial pressure that we're given. Thanks!

[Megan Chan 3A]

You need to make an ice table and use the initial pressure and K value to find all the partial pressures at equilibrium.

PCl3 Cl2 PCl5
I 0 0 0.0230
C +x +x -x
E x x 0.0230-x

Once you have the partial pressures of each gas, add them together to find the total pressure.

[Sophia Kalanski 1A]

ok but how do you figure out x from here?

[SainehaMaddineni_3I]

ok but how do you figure out x from here?

Plug the expressions from the E section of the Ice table into the Kp expression (products/reactants). You know the Kp value, so set that Kp expression equal to that value. Solve for x.

[dana hu 1B]

X will just be a placeholder until you have reached using the quadratic formula. Plug all the equilibrium equations into the Kp equation. Then isolate all the numbers and variables to one side, equaling 0. Now use the quadratic formula to figure out the value of the x (should have two positive values). Then decide to that the smaller value to be x, and plug it back to those three equilibrium equations you formed from ICE. With the three partial pressure values, add them together to get the total pressure. Hope this helps.