Moles = n/v where n is the moles of solute and v being the liters of solution. We can put in the information provided to find the molarity.
Moles = .45/3.0 = .15 So we now know that the molarity of that solution is .15! I hope I helped you :). Make sure to memorize that formula because it's not that hard as long as you know what to plug in.
The answer is B. The complete equation is C6H12O6 + 6O2 -->6H2O + 6CO2 + energy. So we can know that A and C and D is right. For B, the reaction release energy so it is exothermic reaction.