For A -> P, [A] decreases while [P] increases. The rate of A consumption equals the rate of P production when:
- A
Never
- B
The reaction is at equilibrium only
- Ccheck_circle
The stoichiometry is 1:1
- D
Always
Explanation
Rates expressed per stoichiometric coefficient are equal; for 1:1 stoichiometry the actual rates match.