Look at the pic. I don't know the reason why it should be
7/2 when matching O of this.
You can see why the numerator is 7.
But I don't know why the denominator is 2.

teach me please!

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

Arrange the elements in order of increasing electronegativity. use the periodic table to you arrange the elements. p o k mg