When 1.06 g of liquid PC13 at 11.8 C is added to a solution of water at in a coffee cup calorimeter, the temperature of the solution increases to 38.1C. If the heat
capacity of the solution and calorimeter is 421.7 J/C, calculate the molar heat of the
PC13. Answer to 0 decimal places in kJ/mol.

Where are the options.

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.