hem 114-Fall 201a n it giving a fter contained 75.0 g of water at 195C 933e pera

Question

hem 114-Fall 201a n it giving a fter contained 75.0 g of water at 195C 933e perature of 19 68 for the eystem Cakulate the C) for Fe (10p it, giving a final t Specific heats are 4.184 J the following reactions have the equilibrium following 11. At a certain temperature shown: K"m = 3.1 x 10" Calculate the equilibrium constant and the change in enthalpy for thefol-3952 2S0; (g) + O2(g) 2SO, (g) SO, (g) 320; (g) for the following reaction at the same s (s) + temperature. (12pt) 12. Calculate the molar solubility of aluminum hydroxide in water if the Kp 13 x 10 (10pt)

Explanation / Answer

Q11

find 2SO2 + O2 = 2SO3 K

K can be obtained via the manipulation of:

invert rxn 1:

2SO2 = 2S + 2O2 K = 1/(1.8*10^29) = 5.555*10^-30

multiply rxn 2 by 2

2S + 3O2 = 2SO3 K = (3.1*10^19)^2 = 9.61*10^38

add both

2S + 3O2 + 2SO2 = 2S + 2O2 + 2SO3 K = (5.555*10^-30)(9.61*10^38) = 53.38*10^8 = 5.338*10^9

for H:

Htotal = -H1 + 2*H2 = -(-592.8) + 2*-395.2 = -197.6 kJ/mol

Q12.

Al(HO)3 = Al+3 + 3Oh-

Ksp = [Al+3][OH-]^3

1.3*10^-33 = s*(3s)^3

27*S^4 = 1.3*10^-33

S = ((1.3*10^-33)/27))^(1/4) = 2.6341*10^9 M

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