Question

E) Mg?"(aq) + 2 NO, (aq) —> Mg(NO)>(s) 8. When solid ammonium nitrate (NH.NOs) dissolves in water, the process is endothermic, with AH solution = +25.69 kJ/mol. (This reaction has been used in commercial cold packs.) If 5,60 8 NH.NO, is dissolved in 100.0 g of water at 22.0° C, what is the final temperature of the solution? The mass of the solution is 105.6 g (100.0 8 +5,60 g = 105.68) and its specific heat capacity is 4.18 J/(8-K). A) 0.0*C B) 17.9° C) 11.6 C D ) -54.8* C E ) 26.1°C Chan that the standard molar enthalpy of formation of aluminum oxide, AI,O (s). follow

Answer 1

1 mol NH4NO No of moles of NH4NO 5.60 g x- 0.0700mol NHNO3 80.05 g Heat of solution = 25.69 kJ/mol 25.69 kJ 0.0700 mol x- Amount of heat rel eased in the reacti on 1 mol = 1.798 kJ 1798 J Amount of heat released in the reaction is equal to the heat absorbed by solution We known that s0htionpa =-(1798 J) 1798 J 105.6 g Mass of solution Specificheat of soluti on ,s = 4.18 J/g C Initi al temperature ,7 22.0°C Amount of heat absorbedby soluti on, q,hnin = ms(T2-T) -1798 J soltian T- -4.1° C J ms 105.6 g x4.18- g.C Final temperature T4.1°C= : -4.1° C+22.0° C = 17.9°C