1.) In a reaction, gaseous reactants form a liquid product. The heat absorbed by the surroundings is 26.0 kcal, and the work done on the system is 15,650 J. Calculate the change of inner energy of the system DE in kJ.
2.) Calculate the heat q transferred, when 25 g of water is heated from 18 °C to 92 °C?
3. A 300-g aluminum engine part at an initial temperature of 13 °C absorbs heat of 175 kJ. What is the final temperature after the heat absorption of the aluminum part?
(specific heat capacity of aluminum cAl = 0.900 J/ g à K).
4.) Consider the following balanced thermochemical reaction equation for the mineral magnesite:
MgCO3(s) ® MgO + CO2(g) ; DH = + 117.3 kJ
(a) Is this reaction endo- or exothermic?
(b) What is DH of the reverse reaction?
(c) What is DH if 150 g of MgCO3 are decomposed?
(d) What is DH if 10 mol of CO2 react with an excess of MgO?
5. Acetylene burns in air by the following equation:
2 C2H2(g) + 5 O2 ® 4 CO2(g) + 2 H2O(g) ; DHR°= - 2511.6 kJ
Given DHf° of CO2(g) = - 393.5 kJ/mol and DHf° of H2O(g) = - 241.8 kJ/mol, find DHf° of C2H2(g).
1.) In a reaction, gaseous reactants form a liquid product. The heat absorbed by the surroundings is 26.0 kcal, and the work done on the system is 15,650 J. Calculate the change of inner energy of the system DE in kJ.
2.) Calculate the heat q transferred, when 25 g of water is heated from 18 °C to 92 °C?
3. A 300-g aluminum engine part at an initial temperature of 13 °C absorbs heat of 175 kJ. What is the final temperature after the heat absorption of the aluminum part?
(specific heat capacity of aluminum cAl = 0.900 J/ g à K).
4.) Consider the following balanced thermochemical reaction equation for the mineral magnesite:
MgCO3(s) ® MgO + CO2(g) ; DH = + 117.3 kJ
(a) Is this reaction endo- or exothermic?
(b) What is DH of the reverse reaction?
(c) What is DH if 150 g of MgCO3 are decomposed?
(d) What is DH if 10 mol of CO2 react with an excess of MgO?
5. Acetylene burns in air by the following equation:
2 C2H2(g) + 5 O2 ® 4 CO2(g) + 2 H2O(g) ; DHR°= - 2511.6 kJ
Given DHf° of CO2(g) = - 393.5 kJ/mol and DHf° of H2O(g) = - 241.8 kJ/mol, find DHf° of C2H2(g).
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