posted by mem .
In the theoretical reaction
2 B(aq) + 3 D(aq) ---> E(aq) + 4 F(aq)
the concentration of D(aq) is 0.40 mol/L. If 25.0 mL of aqueous B is needed to react completely with 30.0 mL of aqueous D, the concentration of B(aq) is
I answered B?
Right. Go to the head of the class.