WorksheetsEnthalpy and Specific Heat
Total questions: 16
Worksheet time: 1hrs 14mins
Calculate the standard molar enthalpy of combustion for ethane, C2H4,
C2H4 (g) + 3 O2(g) --> 2 CO2(g) + 2 H2O(g)
Hf, C2H4 (g) = +52 kJ/mol
Hf, CO2(g) = -394 kJ/mol
Hf, H2O(g) = -242 kJ/mol
-204 kJ
-584 kJ
-679 kJ
-1324 kJ
Calculate the standard enthalpy of combustion for the reaction
SiH4 (g) + 2 O2(g) --> SiO2(g) + 2 H2O(g)
Hf, SiH4 (g) = +34 kJ/mol
Hf, SiO2(g) = -911 kJ/mol
Hf, H2O(g) = -242 kJ/mol
-1187 kJ
-1429 kJ
-1360 kJ
-2219 kJ
Calculate the standard molar enthalpy of combustion for the reaction
2 NO2 (g) + 7 H2(g) --> 2 NH3(g) + 4 H2O(g)
Hf, NO2 (g) = +33 kJ/mol
Hf, NH3(g) = -42 kJ/mol
Hf, H2O(g) = -242 kJ/mol
-1118 kJ
-255 kJ
-808 kJ
-993 kJ
What is the sign of the enthalpy change for an endothermic reaction?
Positive
Cannot be determined
negative
Depends on the pressure
What is the unit for specific heat capacity?
J
kg
K
J/(g ˑoC)
What is the unit for Q in the equation Q = m·Cˑ∆T?
J
kg
K
J/(g ˑoC)
Calculate the standard molar enthalpy of combustion for sucrose, C12H22O11,
C12H22O11 (s) + 6 O2(g) --> 6 CO2(g) + 11 H2O(g)
Hf, C12H22O11 (s) = -2222 kJ/mol
Hf, CO2(g) = -394 kJ/mol
Hf, H2O(g) = -242 kJ/mol
-2804 kJ
-5840 kJ
-6790 kJ
-1324 kJ
Calculate the amount of heat required to heat 357 g of ethylene glycol (antifreeze) from 0oC to 110oC. The specific heat of ethylene glycol is 2.42 J/(gˑK).
16.2 kJ
71.5 kJ
39.3 kJ
95.0 kJ
Calculate the specific heat of Freon-12 if it requires 29.3 joules of heat to raise the temperature of 89.1 g of this gas by 55.0oC.
0.000900 J/(g·K)
0.00598 J/(g·K)
1.67 J/(g·K)
2.83 J/(g·K)
If the specific heat of a substance is low, this means that _____.
It heats up and cools down fast.
All answers are correct.
Has no effect.
It takes longer to heat up and cool down.
Which of the follow represents a normal body temperature of 98.6°F in °Celsius? 5/9 x (0F - 32)
37°C
370°C
72.5°C
72.6°C
On a hot summer day, a student dropped an ice cube onto a park bench. Within minutes, the ice cube melted. Which best describes the process the student observed?
radiation
combustion
conduction
convection
