Question

A chemist put 2.01 mol of substance A and 3.15 mol of substance B into a 10.0 L flask, which she then closed. A and B react by the following equation

A(g) + 2 B(g) 3 C(g) + D(g)



She found that the equilibrium mixture at 25°C contained 0.966 mol of D. How many moles of B are in the flask at equilibrium at 25°C?

Moles of B =
mol