Like the diagram we can see the the products of reaction are obtained with a amount of heat under the heat of reactants... so the reaction is exothermic and the Ea = E* - Eproducts = 100 - 40 = 60 kJ
Answer:
false
Explanation
The chemical bonds were broken when creating the compound MgO.
if 105 grams burns completely
therefore
105 ×22.4/48=49