Name Experiment 14 Data and Calculations: Heat Effects and Calorimetry A. Specif

Question

Name Experiment 14 Data and Calculations: Heat Effects and Calorimetry A. Specific Heat Section Trial 1 17.79, 31,2 Mass of stoppered test tube plus metal d Mass of test tube and stopper Mass of calorimeter Mass of calorimeter and water Mass of water 11383 63.8 1.5Z Mass of metal Initial temperature of water in caforimeter oc Initial temperature of metal (essaune 10 unless directed to do otherwise oC Equilibrium temperature of metal and waier in calorimeter 3.4 c 3.2 c oC eC Specific heat of the metal (Eq. 3) J/g C Unknown metal # B. Heat of Solution Mass of calorimeter plus water 21,27 31.0 2 continued on following page) Mass of beaker

Explanation / Answer

A. specific heat of metal

qwater = mCpdT

m = 68.81 g

Cp = 4.18 J/g.oC

dT = 3.4 oC

so,

qwater = 68.81 x 4.18 x 3.4 = 977.93 J

specific heat of metal = qwater/mass metal x dT(metal)

mass metal = 17.52 g

dT = 73.2 oC

So,

specific heat of metal = 977.93/17.52 x 73.2 = 0.762 J/g.oC

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B. Heat of solution

Total mass = 85.12 g

dT = -6.6 oC (endothermic reaction)

Cp = 4.18 J/g.oC

So,

dH solution = -(85.12 x 4.18 x -6.6/8.92) = 263.26 J/g of metal

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