Question

If you use half as many moles of reactant *

then:   you'll make twice as much money
the reaction won't happen

 
the reaction will release half as much heat  
the reaction will absorb heat

Answer 1

The reaction will release half as much heat

Step-by-step explanation:

Because there are less reactants the amount of energy released will decrease. Because the reactants halves the amount of heat released also halves.

Answer 2

The reaction will release half as much heat