Consider the equation below

plz help don't just give answer explain so i can understand

The equilibrium constant : Kc=[CO₂]

The equilibrium constant is the value of the product in the equilibrium state of the substance in the right (product) divided by the substance in the left (reactant) with the exponents of each reaction coefficient  

The equilibrium constant is based on the concentration (Kc) in a reaction  

pA + qB -----> mC + nD  

Solid (s) and liquid (l) are not included in the calculation of Kc(only aq-aquoeus and g-gas)

From reaction

CaCO₃(s)⇔CaO(s)+CO₂(g)

Because CaCO₃ and CaO are solid, only CO₂ is included in the calculation

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.