Question Detail
Question
For the following reaction, DP(CH₄)/Dt was found to be -6.2 x 10⁻³ atm/s. CH₄(g) → C(g) + 4H₂(g) Determine DP(H₂)/Dt for this reaction at the same time.
Correct Answer
Option A is the correct answer.
Detailed Explanation
From the stoichiometry, the rate of change of H₂ is related to the rate of change of CH₄. For the reaction CH₄ → C + 4H₂, the rate of formation of H₂ is 4 times the rate of disappearance of CH₄ (with a sign change). DP(H₂)/Dt = -4 × DP(CH₄)/Dt = -4 × (-6.2 × 10⁻³ atm/s) = +2.48 × 10⁻² atm/s ≈ 2.5 × 10⁻² atm/s.
Hint
Use the stoichiometric coefficients to relate the rates of change of reactants and products.