This lesson includes 19 additional questions and 6 additional question variations for subscribers.
Lesson Worksheet: Standard Enthalpy Changes Chemistry
In this worksheet, we will practice describing different types of standard enthalpy changes and defining them.
Calculate, to the nearest whole number, the standard heat of combustion of propane (), its molar mass is 44.1 g/mol, in kilojoules per mole if the change in the heat content of the complete combustion of 10 g of propane is J.
- A kJ/mol
- B kJ/mol
- C kJ/mol
- D kJ/mol
The following table shows the standard enthalpies of formation , in kilojoules per mole, of , , and .
|The Standard Enthalpy of Formation|
Which of the following statements is correct?
- A is more thermally stable than .
- B is more thermally stable than .
- C is less thermally stable than .
- D is less thermally stable than .
When a student dissolves 1 mol of a certain solute in water, the heat required to separate solvent particles is 40 kJ, the heat required to dissociate the solute particles is 80 kJ, and the hydration energy is 400 kJ. Calculate the heat of the solution and determine whether the process is exothermic or endothermic.
- A kJ, exothermic
- B kJ, endothermic
- C kJ, endothermic
- D kJ, exothermic
Which of the following has the highest thermal stability?
- A, which has
- B, which has
- C, which has
- D, which has
After analyzing the equation below, determine which of the following represents the type of heat change accompanying this process.
- AStandard heat of combustion
- BStandard heat of formation
- CStandard heat of vaporisation
- DStandard heat of solution
After studying the given diagram, determine the sign for the value of , , and respectively?
- ANegative, positive, and positive
- BPositive, negative, and positive
- CPositive, positive, and negative
- DPositive, positive, and positive
If the separation energy of ammonium nitrate in water is 150 kJ, the hydration energy is 120 kJ, and the separation energy of water is 100 kJ, then this dissolution is .
- Aendothermic and the heat of the solution is kJ
- Bendothermic and the heat of the solution is kJ
- Cexothermic and the heat of the solution is kJ
- Dexothermic and the heat of the solution is kJ
Why is the standard enthalpy of formation of argon gas equal to zero?
- ABecause argon gas has eight electrons in its valence shell
- BBecause argon gas is a poor conductor of heat and electricity
- CBecause argon gas is an
- DBecause the standard enthalpy of formation of argon gas in its standard state is always zero
Arrange the following compounds ascendingly according to their thermal stability.