Consider the reaction represented by the following equation: CuO_{(s)} + H₂SO₄(aq)} → CuSO₄(aq)} + H₂O_{(l)}. Which of the following factors will not affect the rate of the reaction?

Pressure affects reaction rates mainly when gases are involved, because it changes gas concentration. Reactions that involve only solids and aqueous solutions are generally unaffected by pressure.

Explanation:

The given reaction is:

\mathrm{CuO_{(s)} + H_2SO_{4(aq)} \rightarrow CuSO_{4(aq)} + H_2O_{(l)}}

Here, the reactants are a solid and an aqueous solution, and no gaseous reactant or product is formed.

Particle size of

\mathrm{CuO_{(s)}}

changes the available surface area for reaction, so it influences the rate.

Concentration of

\mathrm{H_2SO_{4(aq)}}

changes how frequently reactant particles collide, so it influences the rate.

Temperature changes the kinetic energy of particles and the number of effective collisions, so it influences the rate.

Pressure influences the concentration of gases only, and since no gas is present in this reaction, pressure will not affect its rate.

Answer:

D. Pressure of reaction system

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