Which of the following may affect the value of the rate constant? Catalysts Conc

Question

Which of the following may affect the value of the rate constant? Catalysts Concentration of reactants Temperature Answers B and C Answers A. B, and C Express the equilibrium constant for the following reaction K=[PCl_3]^2/[P]^2[Cl_2]^3 K = [PCl_3]^1/[P]^2[Cl_2]^3 K=[PCl_3]^2/[P]^2[Cl_2]^3 K = [PCl_2]^1/[P]^2[Cl_2]^3 The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant. 1.9 times 10^4 5.3 times 10^-5 2.6 times 10^-5 6.4 times 10^-4 1.6 times 10^5

Explanation / Answer

21.Arrhenius Equation shows what factors affect the rate constant.

k = A.e-Ea/RT

Thus k depends on Activation Energy.Since catalyst lowers the activation energy,this means the presence of catalyst will affect the rate constant.

Temperature is also in the Arrhenius Equation.It affects the rate constant.Higher temperature means higher rate constant.

Concentration of reactants is not present in the Arrhenius equation but it affects the rate of a reaction as showed by the rate law expression for a general reaction,

aA+bB--->cC + dD

Rate law = k[A]x[B]y

Thus rate constant will be affected by concentration of the reactants.

Thus,E is the answer.

22.for any general reaction,

aA + bB---> cC + dD

k is ratio of concentration of products raised to their stoichiometric coefficients to the concentration of reactants raised to their stoichiometric coefficients.

K=[C]c[D]d/[A]a[B]b

So for the reaction

2P(g) + 3Cl2(g)<---> 2PCl3(g)

K = [PCl3]2/[P]2[Cl2]3

Thus,A is the answer

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