The combustion of 10.0 g of an unknown chemical with molar mass = 35.56 g/mol, raises the temperature of 600 mL of water by 25oC. Assuming all the energy released by the reaction is absorbed only by the water, determine the ∆Hcomb of Mg. Note: specific heat capacity H20 = 4.18 J/goC

Your answer should follow the format:

a) q of the water

b) mols of unknown materials

c) ΔHcomb of unknown material with units (2 marks)

what are the two models

explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.