At 20°C, the standard EMF of a certain cell is +0.2699 V, and at 30°C it is + 0.2669 V. What can you say about the standard entropy of this reaction? Assume that the standard ΔH° and ΔS° are independent of temperature:a)ΔS° = 0b)ΔS° = + vec)ΔS° = -ved)None of these.Correct answer is option 'C'. Can you explain this answer?

Question

At 20&#176;C, the standard EMF of a certain cell is +0.2699 V, and at 30&#176;C it is + 0.2669 V. What can you say about the standard entropy of this reaction? Assume that the standard &#916;H&#176; and &#916;S&#176; are independent of temperature:a)&#916;S&#176; = 0b)&#916;S&#176; = + vec)&#916;S&#176; = -ved)None of these.Correct answer is option 'C'. Can you explain this answer?

Answer

As per temperature coefficient of cell,
dS= nF[dE/dT] at constant pressure Here we can se that as temp. Increase E is decrease it means if we take T as positive then E will be negative.
So, here [dE/dT] this ratio will be negative which is directly proportional to the entropy change.
Hence, we can say that dS= (-ve)

Answer

As per temperature coefficient of cell,
dS= nF[dE/dT] at constant pressure Here we can se that as temp. Increase E is decrease it means if we take T as positive then E will be negative.
So, here [dE/dT] this ratio will be negative which is directly proportional to the entropy change.
Hence, we can say that dS= (-ve)

Answer

At 20 years old, many people are in the early stages of adulthood and are experiencing significant transitions in their lives. Here are some common experiences and milestones for individuals at this age:

1. College or University: Many 20-year-olds are pursuing higher education at a college or university. They may be living on campus or commuting from home.

2. Career Exploration: Some 20-year-olds may have started working part-time or internships to gain experience in their desired field. Others may still be figuring out what career path they want to pursue.

3. Independence: At 20, individuals may start to gain more independence from their parents or guardians. This could involve moving out of their childhood home, living with roommates, or taking on more responsibilities in terms of finances and decision-making.

4. Relationships: Some 20-year-olds may be in their first serious relationships, while others are still exploring and figuring out what they want in a partner. Dating and socializing with friends are common activities at this age.

5. Personal Growth: Many 20-year-olds are focused on personal growth and self-discovery. They may be exploring new hobbies, interests, and passions, as well as forming their own identity separate from their family.

6. Travel and Adventure: This is also a time when some 20-year-olds may have the opportunity to travel, whether it's through study abroad programs, backpacking trips, or vacations with friends.

7. Financial Responsibility: As they enter adulthood, 20-year-olds often start to take on more financial responsibilities. This may include budgeting, paying bills, and saving money.

8. Health and Wellness: Many 20-year-olds prioritize their physical and mental well-being. They may be involved in sports, fitness activities, or exploring different ways to maintain a healthy lifestyle.

9. Socializing and Friendships: Friendship circles tend to expand during this time, as individuals meet new people through college, work, or other social activities. Friendships become increasingly important for support and socializing.

10. Decision-making and Goal-setting: At 20, many individuals are starting to make more significant decisions about their future. They may be setting long-term goals for their education, career, and personal life.

Overall, being 20 is a time of exploration, growth, and transition as individuals navigate the path from adolescence to adulthood.

Similar Chemistry Doubts

For a cell reaction, E (at 25oC) = 1.26V, n = 2 andΔS = -96.5JK-1mol-1. E at 85oC by assumingΔS to be independent of temperature is _____ (V). [Given F = 96500 Cmol-1] (Round off to two decimal places). Correct answer is '1.23'. Can you explain this answer?

Standard enthalpy and standard entropy changes for the oxidation of NH3 at 298 K are 382.64 KJ mol1 and 145.6 JK1mol1, respectively. Standard Gibbs energy change for the same reaction at 298 K is

At a certain temperature, kC= 0.11 for the reaction,The equilibrium concentration of IC1 if 0.75 mole of I2and 0.75 mol of CI2areinitially mixed in 2L flask is ___mol/L. (Round off to two decimal places). Correct answer is between '0.35,0.50'. Can you explain this answer?

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