Name HOMEWORK EXERCISES This homework is shree pages 1. Magnesium solid reacts w

Question

Name HOMEWORK EXERCISES This homework is shree pages 1. Magnesium solid reacts with aqueous hydrochloric acid to form the Mg ion in solution. In an experiment, 60.0 mL of aqueous HCl was mixed with 0.1297 g of magnesium solid in a double styrofoam cup calorimeter. The reaction caused the temperature of the substances in the calorimeter to rise 10.02°C. Assume the density and specific heat of the HCI solution is that of water, 1.00 g/mL and 4.184 J/g °C, respectively. The specific heat of magnesium is 1.02 J/g °C. a. Write the balanced chemical equation for this reaction. b. Calculate the heat of this reaction, hn, in kJ. c. Calculate the heat of this reaction per mole of Mg2 formed, AHn/mole Mg' d. The literature value of this reaction is -466.85 kJ/mole. Calculate the percent deviation of the experimental value from the literature value. 2. A 45.5 kg copper rod (s = 0.385 J/g °C) is heated to 475.0°C and then quenched into a well-insulated water bath containing 1000.0 kg of water at 25.0°C. What is the final temperature of the mixture? 91

Explanation / Answer

3. heat release by 20 ml ice from -15 to 0 degree = (15-0)x20x2.1 joule = 630 joule

heat release for melting of 20 ml ice in to 20 ml water = 20x334 joule = 6680 joule

total heta loss = 7310 joule.

the heat absorb by the tea = 7310 joule

let temperature decrease = delta T

so delta T x 375 ml x 4.187 joule/g = 7310

so delta T = 4.65 degree

so final temperature = 22.5 -4.65 = 17.84 degree

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