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Question

ers.edu/webapps/assessment/take/launchisp?course assessment id-193201 &course; ad- 861 15,1&content; id- 13894 ackboard s Content Collection Libraries Support 19.2°c 24.8°C 20.4°C 27.40C 25.6 oc QUESTION 10 2.00 grams of Mn is burned in a bomb calorimeter. The water's temperature rose from 20.00 degrees centigrade to 26.73 degrees C The heat capacity of the calorimeter is 2.500 roc What is the enthalpy change (a) for thi?reaction? 3Mnis) + 202(g) -> Mn3O4(s) ?? rxn-? -43.8 k/molrxn O-1387kJ/molrxn O-2.36 x 104kJ/molrxn -7.01 x 102 kJ/molrxn -20.9 kJ/molrxn -602 kJ/molrxn O-1460 kJ/molrxn 1.71 x 103 J/molrxn QUESTION 11 Refer to this equation How much heat is released if 35.0 g of ALs) reacts to completion? 417. k 254 49 k1 Click Sove and Submit to save and submit. Cick Saue All Ansuers to soe all anuers 8 6 8 3

Explanation / Answer

2.00 grams of Mn is burned in a bomb calorimeter. The water's temperature rose from 20.00 degrees centigrade to 26.73 degrees C.   The heat capacity of the calorimeter is 2.500 kJ/oC. What is the enthalpy change (?H) for this reaction?

heat added = heat capacity of calorimeter* change in temperature = 2.5*(26.73-20) KJ=16.825 KJ

since there is temperature rise, the reaction is exothemirc and deltaH= -16.825 Kj

moles of Mn= mass/atomic weight =2/55=0.036 mole

enthalpy change/mole =-16.825/0.036=-463 Kj/mole

since there is three moles of Mn, enthalpy change = -463*3= -1388 Kj ( second one is correct)

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