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Week 4 Hess? Law
University of Phoenix Material
Instructions: Highlight the entire most correct answer for each problem or answer the
questions or fill in the blanks ? must show work for full credit in calculation problems.
Review the following Youtube video: https://www.youtube.com/watch?v=_NLAgSnqNOE
1. Calculate the standard enthalpy change, ?Ho, for the formation of 1 mol of strontium
carbonate (the material that gives the red color in fireworks) from its elements.
Sr (s) C(graphite)
The information available is
O2 (g) SrO (s)
(2) SrO (s) CO2 (g) SrCO3 (s)
(3) C(graphite) O2 (g) CO2 (g)
H - 592 kJ
H - 234 kJ
H - 394 kJ
2. The combination of coke and steam produces a mixture called coal gas, which can be
used as a fuel or as a starting material for other reactions. If we assume coke can be
represented by graphite, the equation for the production of coal gas is
2 C (s) 2 H2O (g) CH4 (g) CO2(g)
Determine the standard enthalpy change for this reaction from the following
standard enthalpies of reaction :
(1) C(s) H2O (g) CO (g) H2 (g)
(2) CO (g) H2O (g) CO2 (g) H2 (g)
H 131.3 kJ
H - 41.2 kJ
(3) CH4 (g) H2O (g)
H 206.1 kJ
3 H2 (g) CO (g)
3. The enthalpy change due to a temperature change is a change in
Week 4 Hess? Law
A. kinetic energy.
B. potential energy.
4. An enthalpy change at constant temperature and pressure is
designated by the symbol
5. The molar enthalpy change for a process is designated by the
6. Another word for melting is _______________.
7. Another word for boiling is _______________.
8. Calculate the enthalpy change when a 10.0 g of water is heated
from 10.0?C to 25.0?C.
9. Calculate the enthalpy change when 10.0 g of water at 100?C is
converted to 10.0 g of
Vapor at 100?C. Show work.
10. Calculate the total change in enthalpy when 100 g of ice at -5.00?C
is converted to water at 85.00?C. Show work.
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