Question Detail
Question
For the following reaction, DP(CH₄)/Dt was found to be -6.2 × 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 stoichiometry, for every 1 mole of CH₄ consumed, 4 moles of H₂ are produced. Rate of change of pressure is proportional to the change in moles. DP(H₂)/Dt = -4 × DP(CH₄)/Dt = -4 × (-6.2 × 10⁻³) = +2.48 × 10⁻³ ≈ 2.5 × 10⁻³ atm/s.
Hint
Use the stoichiometric coefficients to relate the rates of change.