Please explain me to understand those 3 questions! The reaction below has an equ
ID: 987373 • Letter: P
Question
Please explain me to understand those 3 questions!
The reaction below has an equilibrium constant K_c = 1.20 at the conditions of an experiment. An experiment is conducted to determine the time it takes for equilibrium to be achieved starting with [PCI_5] = 1.60 M, (PCI_3] = 0 M, and [Cl_2] = 0 M. What concentration of PCl_3 is expected after the reaction equilibrates? PCl_5(g) doubleheadarrow PCl_3(g) + Cl_2(g) The undesirable (pollution-forming) reaction below occurs at the high temperature of many combustion reactions. At a temperature of 1500 K, the equilibrium constant K_c for this reaction is 1.0 Times 10^-5. Earth's atmosphere is often approximated to have [N_2] = 0.80 M and [O_2] = 0.20 M. Based on these concentrations, what concentration of the pollutant NO is expected when the reaction below equilibrates at 1500 K? Given the two reactions (I and II) below and their associated equilibrium constants, what is the equilibrium constant K_p for reaction III?Explanation / Answer
20. kc = [pcl3][cl2]/[pcl5]
1.2 = (x*x)/(1.6-x)
x = 0.91 M
concentration of pcl3 = 0.91 M
answer: C
21.
Kc = [no]^2 / [o2][n2]
1.0*10^(-5) = (x^2)/((0.8-x)(0.2-x))
x = concentration of NO = 1.26*10^-3 M
answer: 1.3*10^-3 M
22.
2(reverse of equation I) kp = (1/1.2)^2 = 0.694
equation II kp = 0.62
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equation 3 kp = 0.694*0.62 = 0.43