C(s) + 2H2(g) → CH4(g); ∆H= –74.8 kJ mol–1Which of the following diagrams gives an accuraterepresentation of the above reaction?

by
with no comment
Chemistry

Answer

Energy Diagram Explanation

Energy Diagram for the Formation of CH4

The formation of CH4 from graphite and H2 is an exothermic reaction:

ΔH = –74.8 kJ mol⁻¹

Therefore, the products must lie 74.8 kJ below the reactants in the energy diagram.

Key Features of the Energy Diagram:

  • The diagram should include an activation energy peak.
  • There must be a lower plateau for the products compared to the reactants.
  • A downward vertical arrow labelled 74.8 kJ should connect the reactants to the products, indicating energy release.

Only Diagram 1 accurately shows all these features.

Add a Comment

Your email address will not be published. Required fields are marked *