5.1.7: Equilibrium and Kp

Question 1

What is the mole fraction of a substance?

Answer 1

A measure of how much of a given substance is present in a reaction mixture.

Question 2

What is the partial pressure of a substance?

Answer 2

The pressure an individual gaseous substance would exert if it occupied a whole reaction vessel on its own.

Question 3

How is the mole fraction of a substance, A, calculated?

Answer 3

X_A=no. of moles of A / Total no. moles of all substances

Question 4

How do you calculate partial pressure?

Answer 4

P_A= mole fraction x total pressure

(conc. of a substance is proportional to its partial pressure)

Question 5

how do you convert between atm and Pa/kPa

Answer 5

1 atm = 1.01 x 10⁵

^or

101kPa

Question 6

What is the expression for Kp for the reaction

aA + bB ↔ cC + dD

Answer 6

K_p= (P_C)^c(P_D)^D / (P_A)^a(P_B)^b

Question 7

How is the expression for K_p altered when the reaction is heterogeneous?

Answer 7

-Solids and pure liquids are not included in the expression.