Name: ____________________ date: _____________

 

Ch. 10 thermodynamics test [100 points] Chemistry

 

Show your work, include any equation / formula used to get your answer, proper units in your work / answer, proper number of significant figures in your answer, and circle your answer.

 

  1. At 20.0 C, 100 mL 1.0 M HCl is mixed with 100 mL 1.0 M NaOH. Assuming the specific heat of the solution is 4.18 J / g K, what is the maximum temperature of the mixture by answering the following parts: [20 points]

 

    1. write the (balanced) chemical equation that describes this reaction.
    1. calculate HRx for the above reaction.
    2. calculate the # moles of the limiting reactant
    3. calculate HRx for this reaction using your answer in parts (b & c)
    4. determine the change in temperature, then the maximum temperature in the mixture.

 

  1. How much heat is generated / consumed when: [20 points]

10.0 grams C3H8 (g) + excess O2 CO2 (g) + H2O (g) [hint: see problem # 1]

 

 

3. fill-in the below table: +, -, or 0 [20 points]

 

G

H

S

 

+

+

 

+

-

 

-

+

 

-

-

4. Calculate the GR and SRx of the following reaction: [20 points]

 

NaOH (s) Na+ (aq) + OH- (aq)

 

 

5. Is SRx positive, negative, or uncertain in the following reactions ? Justify your answer without calculating its value. [16 points]

 

  1. SO2 (g) + O2 (g) SO3 (g)

 

  1. NO2 (g) + N2O (g) NO (g)

 

  1. CH3OH (l) + O2 (g) CO2 (g) + H2O (g)

 

 

6. Rationalize the sign of SRx in # 4. [4 points]

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