# For which of the following reactions is the ratio kp/kc largest at 300 k?

For which of the following reactions is the kp/kc ratio greater than 300 k?

A. Ni(CO)4(g) ⇌ Ni(s) + 4CO(g)B. C(s) +2H2(g) ⇌ CH4(g)C. CaCO3(s) ⇌ CaO(s) + CO2(g)D. N2(g) + O2(g) ⇌ 2 NO(g) The answer is A. Ni(CO)4(g) ⇌ Ni(s) + 4CO(g) The Kp/Kc ratio is equal to (RT)Δn . K is a constant and the temperature is kept constant. Thus, the Kp/Kc ratio depends on Δn or the difference in moles of product gas and reactant. The reaction with the highest Kp/Kc ratio is Ni(CO)4(g) ⇌ Ni(s) + 4CO(g) with a Δn of 3.

reaction C. has the greatest value of at 300 K Explanation: Here is the complete question Conversion between Kc and Kp For which of the following reactions is the ratio Kp/Kc greater than 300 K? a. N2(g) + O2(g) ⇌ 2 NO(g)
BC(s) +2H2(g) ⇌ CH4(g)
vs. Ni(CO)4(g) ⇌ Ni(s) + 4CO(g)
D. CaCO3(s) ⇌ CaO(s) + CO2(g) Solution where R = molar gas constant = 8.314 J/mol-K, T = temperature = 300 K and n = number of moles of products – number of moles of reactants To reaction A. number of moles of gaseous products = 2, number of moles of gaseous reactants = 2. Then n = 2 – 2 = 0 So for reaction b. number of moles of gaseous products = 1, number of moles of gaseous reactants = 2. So n = 1 – 2 = -1 (not counting the solid) So, for reaction c. number of moles of gaseous products = 5, number of moles of gaseous reactants = 1. So n = 4 – 1 = 3 (not counting the solid) So, for reaction d. number of moles of gaseous products = 2, number of moles of gaseous reactants = 0. So n = 2 – 0 = 2 (not counting the solid) So, since for reaction c which is the largest value. So reaction c. has the highest value at 300K