How much heat, in Joules, is needed to raise the temperature of 150 g of manganese by 22°C? (cmanganese = 0.477 J/g°C)

if you mean hydrogen and oxygen then water is the product

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.