QUIZ FOR CHEMICAL ENGINEERING
WITH VERIFIED ANSWERS|100%
CORRECT|GRADE A+
The heat of reaction remains the same even if stoichiometric coefficients are changed (True/False) -
ANSWER False
Why do heats of reaction change if different phases are given for products or reactants? - ANSWER The
heat of reaction must account for the phase change
What conditions are used for the standard heat of reaction? - ANSWER 25 Celsius and 1 atm
What is the main problem with using a calorimeter to determine heat of reaction? - ANSWER They can
be hard to isolate the reactions of interest
The standard heat of formation for the oxygen atom is zero. (T/F) - ANSWER False
Which of the following are assumptions made when determining and using heat of combustion? -
ANSWER All carbons form CO2
All sulfur forms SO2
All hydrogens form H2O
All nitrogen's form N2
What are the two methods discussed for choosing enthalpy reference states and calculating specific
enthalpies - ANSWER Heat of reaction method and heat of formation method
In the heat of formation method, what reference states are most convenient to choose when there are
reacting species - ANSWER The state of the elemental species constituting the products and reactants at
STP
Inlet-outlet enthalpy only - ANSWER In the heat of the formation method, what is specific enthalpy
determined from?
WITH VERIFIED ANSWERS|100%
CORRECT|GRADE A+
The heat of reaction remains the same even if stoichiometric coefficients are changed (True/False) -
ANSWER False
Why do heats of reaction change if different phases are given for products or reactants? - ANSWER The
heat of reaction must account for the phase change
What conditions are used for the standard heat of reaction? - ANSWER 25 Celsius and 1 atm
What is the main problem with using a calorimeter to determine heat of reaction? - ANSWER They can
be hard to isolate the reactions of interest
The standard heat of formation for the oxygen atom is zero. (T/F) - ANSWER False
Which of the following are assumptions made when determining and using heat of combustion? -
ANSWER All carbons form CO2
All sulfur forms SO2
All hydrogens form H2O
All nitrogen's form N2
What are the two methods discussed for choosing enthalpy reference states and calculating specific
enthalpies - ANSWER Heat of reaction method and heat of formation method
In the heat of formation method, what reference states are most convenient to choose when there are
reacting species - ANSWER The state of the elemental species constituting the products and reactants at
STP
Inlet-outlet enthalpy only - ANSWER In the heat of the formation method, what is specific enthalpy
determined from?
