AP Chemistryeasymcq1 pt
An ICE table tracks A + B ⇌ AB beginning with 1.0 M A and 1.0 M B and no AB. At equilibrium [AB] = 0.50 M. What is [A] at equilibrium?
A.0.50 M
B.1.5 M
C.0.25 M
D.1.0 M
Explanation
Core Concept
With 1:1:1 stoichiometry, every mole of AB formed consumes one mole of A and one of B. Forming 0.50 M AB therefore removes 0.50 M from each starting 1.0 M pool. Subtracting along the Change row gives [A] = 1.0 - 0.50 = 0.50 M, mirrored by [B]. ICE bookkeeping turns one known equilibrium amount into all the rest.
Correct Answer
A0.50 M
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