Which equation would be used to calculate the rate constant from initial
concentrations?

Where,

K eq= Equilibrium concentration

C and D=products

A and B= Reactants

a,b= moles of reactants

A and B respectively

c,d= moles of product respectively

hope it helps.......

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

it would be a gas formation