4)Methanol can be produced by the followving reversible r CO(g) + 2H2(g)CHOH(g)

Question

4)Methanol can be produced by the followving reversible r CO(g) + 2H2(g)CHOH(g) When 0.40 mol of CO and 0.30 mol of Ha are allowed to reach equilibrium in a 1.0 L container, 0.060 mol of CHyOH is formed. What is the value of K.? A. 0.50 B. 0.98 C. 1.7 D. 5.4 42) In which of these processes is entropy decreased? A. dissolving sugar in water B. expanding a gas C. evaporating a liquid D. freezing water 43)The gas phase reaction Adg) + B2(g) 2ABO is zero order in A2 and second order in B2. If the concentrations of both A2 and B2 are doubled, the reaction rate will change by a factor of: A. 1/2 B. 212 C. 2 D. 4 44) What is the pH of a 10.00 M NaOH solution? A. 15.00 B. 13.00 C. 10.00 45) During a titration how many mL of 0.100 M NaOH must be added to 50.0 mL of 0.200 M HC H,02 to reach the endpoint? A. 25.0 mlL B. 50.0 mL C. 75.0 mL D. 100 mL

Explanation / Answer

41)

Since volume is 1 L, concentration will be same as number of moles

Let's prepare the ICE table

[CO] [H2] [CH3OH]

initial 0.4 0.3 0

change -1x -2x +1x

equilibrium 0.4-1x 0.3-2x +1x

To find x, we will use the equilibrium concentration provided in the question

[CH3OH] = 0.06

+1x = 0.06

x = 0.06

Equilibrium constant expression is

Kc = [CH3OH]/[CO][H2]^2

Kc = (+1x)/(0.4-1x)(0.3-2x)^2

Kc = (+1*0.06)/(0.4-1*0.06)(0.3-2*0.06)^2

Kc = 5.44

Answer: D

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