18. For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-L container. At equilibrium, the concentration of A is 0.261 mol/L. What is the concentration of B at equilibrium?
(A)0.261 mol/L
(B)0.355 mol/L
(C)0.500 mol/L
(D)0.522 mol/L

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