Calculating Equilibrium Concentrations The concentrations of reactants and produ
ID: 494027 • Letter: C
Question
Calculating Equilibrium Concentrations The concentrations of reactants and products for a chemical reaction can be calculated if the equilibrium constant for the reaction and the starting concentrations of reactants andor products are known. previous l 2 of 32 l next. Part A Carbonylfluoride, COFh, is an important intermediate used in the production of compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction 200F2 (g) t CO, (g) +CF4 (g), He 6.60 lf only COF2 is present initialy at a concentration of 200 M what concentration of coF, remains at equilibrium? Express the molar concentration numerically. Submit Hints My Answers Give Up Review Part Part B Consider the reaction CO(g) +NH3(g) a HCONH (g), Ke 0.760 If a reaction vessel initially contains only CO and NH3 at concentrations of 100 Mand 200 M respectively what will the concentration of H 2 be at equilibrium? Express the molar concentration numerically to three significant figures.Explanation / Answer
2COF2-----------------> CO2 + CF4
I 2 0 0
C -2x x x
E 2-2x x x
Kc = [CF4][CO2]/[COF2]^2
6.6 = x*x/(2-2x)^2
6.6 =( x/2-2x)^2
2.57 = x/2-2x
2.57*(2-2x) = x
x= 0.84
[COF2] = 2-2x = 2-2*0.84 = 0.32M
partB
CO + NH3 -----------------> HCONH2
I 1 2 0
C -x -x +x
E 1-x 2-x +x
Kc = [HCONH2]/[CO][NH3]
0.76 = x/(1-x)(2-x)
0.76*(1-x)(2-x) = x
x= 0.53
[HCONH2] = x= 0.53M
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