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CHM/150 Week 4 Hess' Law Name:-(Answered)

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CHM/150

 

Week 4 Hess? Law

 

Name: _____________________________________________________

 


 

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)

 


 

3

 

2

 


 

O2 (g)

 


 

SrCO3 (s)

 


 

The information available is

 

(1)

 


 

Sr (s)

 


 

1

 

2

 


 

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

 


 

CHM/150

 

Week 4 Hess? Law

 

Name: _____________________________________________________

 

A. kinetic energy.

 

B. potential energy.

 

4. An enthalpy change at constant temperature and pressure is

 

designated by the symbol

 

A. q

 

B. H

 

C. _H

 

D. c

 

5. The molar enthalpy change for a process is designated by the

 

symbol

 

A. q

 

B. H

 

C. H

 

D. c

 

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.

 

Show working.

 


 

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.

 


 

 

Paper#9256653 | Written in 27-Jul-2016

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