When the amount of energy required to break bonds in the reactants is less than the amount of energy released in forming bonds in the products, the process has a negative change in enthalpy (−δh). true false

the enthalpy of a reaction is calculated from the following formula

ΔHrxn = ∑ΔHf(products)-∑ΔHf(reactants)

Now its clear from the formula that if

a) the enthalpy of products will be more than the reaction enthalpy will be positive [endothermic reaction]

b) the enthalpy of products will be less than the reaction enthalpy will be negative [exothermic reaction]

Also

ΔHrxn = ∑Bond energies of reactants - ∑Bond energies of products

So

if bond energy of reactants [the energy required to break bond] is less than the bond energy of products the enthalpy of reaction will be negative.

b is the correct answer

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