Question

under what conditions kp =kc for a gaseous reaction

Answer 1

when delta n is zero
that means when sum of coefficients of product is equal to sum of coefficients of reactants

Answer 2

Answer: when number of moles of gaseous products = number of moles of gaseous reactants

Explanation: $K_p=K_c\times (RT)^{\Delta n_g}$

where,

$\Delta n_g$= number of moles of gaseous products - number of moles of gaseous reactants

R = gas constant

T= temperature

For reaction: $H_2(g)+I_2(g)\rightarrow 2HI(g)$

$\Delta n_g$= number of moles of gaseous products - number of moles of gaseous reactants= 2-2= 0

$K_p=K_c\times (RT)^0$

$K_p=K_c$              $(RT)^0=1$