CHM2132_DGD_assign3_2023 (3)

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University of Ottawa *

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2132

Subject

Chemistry

Date

Dec 6, 2023

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pdf

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1

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CHM2132 DGD Assignment #3 One copy of your group’s solutions must be uploaded to Brightspace on your Group page by 8 pm on Wednesday September 27 th . You must show your work to receive full credit. Appropriate sig figs and units are required in the final answer. Assignments that are not legible cannot be marked. After the DGD, every student must record participation marks for each of their group members using the link: https://forms.gle/66vye2vv6dcdtbNN8 Students who do not complete the form will not receive credit for participation at that DGD. Question 1. Alcohol fermentation involves the breakdown of glucose into ethanol and carbon dioxide by the reaction: C 6 H 12 O 6 (s) ® 2 C 2 H 5 OH (l) + 2 CO 2 (g) a) How much heat would be liberated by a yeast culture that ferments 1.00 kg of glucose under standard conditions? (Use textbook Table 2C.6 and 2C.7 in this calculation.) b) Calculate D U° for this process under standard conditions. Question 2. Suppose 25 mL of an ideal diatomic gas ( ࠵? !,# $ = % & ࠵? ) at 28.6 o C, 0.975 atm in a thermally insulated syringe is injected into a thermally insulated tube having a volume of 5.00 mL. a) If this process was carried out reversibly, what would be the final temperature of the gas in the tube? b) What is the final temperature of the gas in the tube if this compression was done by the application of a constant external pressure of 3.65 atm? Question 3. Lithium batteries are widely used in portable electronic devices and electric vehicles. However, operation of these batteries tends to generate heat, which can raise the temperature of the device. The amount of energy required to raise the temperature of lithium is temperature dependent, and follows the relationship: ࠵? !,# $ (࠵?) ࠵? ࠵? %& ࠵?࠵?࠵? %& = 0.1695 − 8.827 × 10 %’ ࠵? ࠵? + 1.977 × 10 %( ࠵? ࠵? ) ) − 1.487 × 10 %* ࠵? ࠵? + + 1.61 × 10 + ࠵? ) ࠵? ) How much energy must be removed from a battery at 25.0 o C containing 3.00 kg of lithium (the amount that is in an electric vehicle battery) to prevent it from undergoing a 95.0 o C increase in temperature under standard conditions?
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