1. 3.000 grams of Ca is burned in a bomb calorimeter. The water’s temperature ro
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Question
1. 3.000 grams of Ca is burned in a bomb calorimeter. The water’s temperature rose from 20.0 degrees centigrade to 21.79 degrees centigrade. The heat capacity of the calorimeter is 26.60 kJ/C. What is the enthalpy change for this reaction as written. The thermochemical equation is: 2Ca (s) + O2 (g) —> 2CaO (s)2. 1.30 grams of C7H6O2 is combusted in a bomb calorimeter. The water’s temperature rose from 20.00 degrees centigrade to 21.58 degrees centigrade. The heat capacity of the calorimeter is 10.90 kJ/C. What is the enthalpy change for this reaction. The thermochemical reaction is: 2C7H6O2 + 15O2 —> 14CO2 + 6H2O
3. 0.560 grams of C6H6 is burned in a bomb calorimeter. The water rises in temperature from 22.0 degrees centigrade to 29.90 degrees centigrade. The heat capacity of the calorimeter (bomb plus water) is 2.96 kJ/C. What is the enthalpy change for the combustion of one mole of C6H6? The thermochemical equation is: C6H6 (l) + 15/2O2 —> 6CO2 (g) + 3H2O (l) 1. 3.000 grams of Ca is burned in a bomb calorimeter. The water’s temperature rose from 20.0 degrees centigrade to 21.79 degrees centigrade. The heat capacity of the calorimeter is 26.60 kJ/C. What is the enthalpy change for this reaction as written. The thermochemical equation is: 2Ca (s) + O2 (g) —> 2CaO (s)
2. 1.30 grams of C7H6O2 is combusted in a bomb calorimeter. The water’s temperature rose from 20.00 degrees centigrade to 21.58 degrees centigrade. The heat capacity of the calorimeter is 10.90 kJ/C. What is the enthalpy change for this reaction. The thermochemical reaction is: 2C7H6O2 + 15O2 —> 14CO2 + 6H2O
3. 0.560 grams of C6H6 is burned in a bomb calorimeter. The water rises in temperature from 22.0 degrees centigrade to 29.90 degrees centigrade. The heat capacity of the calorimeter (bomb plus water) is 2.96 kJ/C. What is the enthalpy change for the combustion of one mole of C6H6? The thermochemical equation is: C6H6 (l) + 15/2O2 —> 6CO2 (g) + 3H2O (l) 2Ca (s) + O2 (g) —> 2CaO (s)
2. 1.30 grams of C7H6O2 is combusted in a bomb calorimeter. The water’s temperature rose from 20.00 degrees centigrade to 21.58 degrees centigrade. The heat capacity of the calorimeter is 10.90 kJ/C. What is the enthalpy change for this reaction. The thermochemical reaction is: 2C7H6O2 + 15O2 —> 14CO2 + 6H2O
3. 0.560 grams of C6H6 is burned in a bomb calorimeter. The water rises in temperature from 22.0 degrees centigrade to 29.90 degrees centigrade. The heat capacity of the calorimeter (bomb plus water) is 2.96 kJ/C. What is the enthalpy change for the combustion of one mole of C6H6? The thermochemical equation is: C6H6 (l) + 15/2O2 —> 6CO2 (g) + 3H2O (l)
Explanation / Answer
Q1
mol of Ca = mass/MW = 3/40 = 0.075
dT = 21.79-20 = 1.79°C
Cp cal = 26.6 kJ/C
find heat exchange
-Qrxn = Qcalorimter
Qcalorimter = Ccal * d T= 26.6 * 1.79 = 47.614 kJ
now, Qrxn = -Qcal = -47.614 kJ
QRxn = n*HRxn
HRxn = -47.614 kJ / n = -47.614 kJ / 0.075 mol
HRxn = -634.85 kJ/mol Ca
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