Specific Heat Capacity of a Metal Assume Swate4.184J/g C) Mass of water Temperat

Question

Specific Heat Capacity of a Metal Assume Swate4.184J/g C) Mass of water Temperature change of the metal Temperature change of the water Heat transferred to the water Heat transferred to the metal Specific heat capacity of the metal Approximate molar mass of metal (Eqn 5) Identity of the metal B. Heat of Reaction for Dissolving a Salt in Water (Assume Ssol 4.002J/g'C) Mass of water Mass of solid Mass of solution Temperature change of the solution Heat of solution ol Heat of the reaction (AH.) Moles of solid used in the reactiorn Heat of reaction per mole of solid |/mol)

Explanation / Answer

A. Specific heat of metal

heat lost by metal = heat gained by water

heat = mCpdT

m = mass of metal / water

Cp = specific heat of water / metal

dT = change in temperature

So,

37.7 g x Cp x (100 - 28.5) = 50.9 g x 4.18 J/g.oC x (28.5 - 22)

specific heat of metal (Cp) = 0.513 J/g.oC

B. Heat of reaction by dissolving salt in water

mass of water = 49.9 g

mass of salt = 5.0 g

total mass = 54.9 g

specifc heat water = 4.18 J/g.oC

change in temperature = 16.3 - 22.3 = -6 oC

So,

heat of solution = 54.9 x 4.18 x -6

                         = -1.38 kJ

enthalpy of reaction = 1.38 kJ x 101.1032 g/mol/5.0 g = 27.90 kJ/mol

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