Enthalpy Hess Law

Quiz
•
Chemistry
•
10th - 12th Grade
•
Hard
+2
Standards-aligned
Charles Martinez
FREE Resource
25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The standard enthalpy change for the combustion of graphite is −393.5 kJ/mol and that of diamond is −395.4 kJ/mol.
What is the enthalpy change for the reaction below, in kJ/mol?
C (s, graphite) → C (s, diamond)
−1.9
+1.9
−788.9
+788.9
Tags
NGSS.HS-PS3-1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the change in Enthalpy of the combustion reaction of liquid Ethanol (C2H5OH). When Ethanol has an enthalpy of -286 kJ/ mol, water is liquid and oxygen and carbon dioxide are in gas state.
-286 kJ/ mol
1366 kJ/mol
-2732 kJ/ mol
-1366 kJ/mol
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The standard enthalpy changes of formation of carbon dioxide and of methanoic acid are −394 kJ/mol and −409 kJ/mol respectively. Calculate the enthalpy change for the reaction
H2 (g) + CO2 (g) → HCOOH (l)
−803 kJ/mol
−15 kJ/mol
+803 kJ/mol
+15 kJ/mol
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Tags
NGSS.HS-PS3-1
NGSS.HS-PS3-4
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
C(s, graphite) + 1⁄2O2(g) --> CO(g) cannot be measured directly since some carbon dioxide is always formed in the reaction.
It can be calculated using Hess’s Law and the enthalpy changes of combustion of graphite and of carbon monoxide.
C(s, graphite) + O2(g) --> CO2 ΔH=-394 kJmol–1
CO(g) + 1⁄2O2(g) --> CO2 ΔH=-283 kJmol–1
The enthalpy change for the reaction of graphite with oxygen to give carbon monoxide is
Tags
NGSS.HS-PS1-4
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
C(s) + O2(g) -> CO2(g) ∆H=a
H2(g) + ½O2(g) -> H2O(l) ∆H=b
C4H9OH(l) + 6O2(g) -> 4CO2(g) + 5H2O(l) ∆H=c
What is the enthalpy change for the reaction shown below?
4C(g) + 5H2(l) + ½O2(g) -> C4H9OH(l)
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which one of the following expressions gives the correct value for the standard enthalpy change of formation of methane in kJ mol–1?
C(s) + 2H2(g) → CH4(g)
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
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