Chapter 14, Problem 14.13QP

A chemist put 1.18 mol of substance A and 2.85 mol of substance B into a 10.0-L flask, which she then closed. A and B react by the following equation:

$\text{A}(g)+2\text{B}(g)\stackrel{}{\rightleftharpoons }3\text{C}(g)+\text{D}(g)$

She found that the equilibrium mixture at 25°C contained 0.376 mol of D. How many moles of B are in the flask at equilibrium at 25°C?

1. a 2.47 mol
2. b 3.60 mol
3. c 2.52 mol
4. d 2.10 mol
5. e 2.41 mol