Question

A certain chemical reaction has a delta H value of -120 kJ/mol. If 2.5 moles of this reactant undergo the reaction, how much energy is released or absorbed by the reaction?

Answer 1

To calculate the energy released or absorbed by the reaction, we can use the following formula:Energy =  delta H  *  moles of reactant In this case, delta H is -120 kJ/mol and the number of moles of reactant is 2.5 moles. So, we can plug these values into the formula:Energy =  -120 kJ/mol  *  2.5 moles Energy = -300 kJSince the energy value is negative, it indicates that the reaction is exothermic and 300 kJ of energy is released by the reaction.