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. \[ \text{A(g)} + 2\text{B(g)} \rightleftharpoons \text{C(g)} \] 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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