AP Chemistryhardmcq1 pt
A mixture initially contains 2.0 M A. For 2A ⇌ B with K = 0.10, what is [B] at equilibrium (approximately)?
A.0.23 M
B.0.40 M
C.0.10 M
D.1.0 M
Explanation
Core Concept
K = x/(2.0 − 2x)² = 0.10 → 0.4x² − 1.8x + 0.4 = 0, giving x = 0.235 M. K is too large to neglect 2x here.
Correct Answer
A0.23 M
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