Q) A student misreads the directions and adds 4.0 g of benzoic acid instead of 0.4 g. What do you expect to happen? Would the experiment still be valid? Explain your reasoning.     Pure Lauric Acid Lauric Acid + 0.4 g Benzoic Acid Lauric Acid + 0.5 g Benzoic Acid Mass of Lauric Acid   3.03g 3.00g 3.00g Mass of Benzoic Acid   0 g 0.40g 0.50g Freezing Point   43’C 39’C 38’C Freezing Point Depression *   4’C 5’C Molality of Benzoic Acid in Lauric Acid*   1.026 mol/kg 1.282 mol/kg Moles of Benzoic Acid *   0.003 moles 0.004 moles Experimental Molar Mass of Benzoic Acid *   133.3g/mol 125 g/mol Average Molar Mass *   129.15g/mol   Percent Error *   5.75%

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Q) A student misreads the directions and adds 4.0 g of benzoic acid instead of 0.4 g. What do you expect to happen? Would the experiment still be valid? Explain your reasoning.

 

 

Pure Lauric Acid

Lauric Acid + 0.4 g Benzoic Acid

Lauric Acid + 0.5 g Benzoic Acid

Mass of Lauric Acid  

3.03g

3.00g

3.00g

Mass of Benzoic Acid  

0 g

0.40g

0.50g

Freezing Point  

43’C

39’C

38’C

Freezing Point Depression *

 

4’C

5’C

Molality of Benzoic Acid in Lauric Acid*

 

1.026 mol/kg

1.282 mol/kg

Moles of Benzoic Acid *

 

0.003 moles

0.004 moles

Experimental Molar Mass of Benzoic Acid *

 

133.3g/mol

125 g/mol

Average Molar Mass *

 

129.15g/mol

 

Percent Error *

 

5.75%

 

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