When C, Heat Capacity is not given?


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When C, Heat Capacity is not given?

Postby VivianaHF2L » Fri Feb 08, 2019 12:31 am

For problem 9.3 the formula for change in temperature is needed but how are we suppose to find Heat Capacity when the number of moles are not given? Without the moles the formula for solving C is not possible.

Andrea Zheng 1H
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Re: When C, Heat Capacity is not given?

Postby Andrea Zheng 1H » Fri Feb 08, 2019 12:40 am

If you are referencing problem 9.3 in 6th Edition textbook, for part (a), you would use the equation deltaS=deltaQ/T. You would get deltaQ = +65J and T = 25 + 273 = 298 K. This gives you a deltaS of 65/298 = 0.22J/K

You would use the same process for part (b), except with 373 K instead of 298.

For part (c), the entropy change in part (a) was higher, because temperature is in the denominator, and thus a lower temperature will result in a higher change in entropy.

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