Which of the following affects the rate of a reaction

D. The concentration of the reactants.

Explanation:

Rate ∝ [Reactants].

Rate of the reaction = k[Reactants]ⁿ.

where, k is the rate constant of the reaction.

n is the order of the reaction.

So, the rate of the reaction depends on the concentration of the reactants.

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.