Question While ice is melting, it absorbs 334 kJ of heat per kilogram of ice. Th

Question

Question While ice is melting, it absorbs 334 kJ of heat per kilogram of ice. This takes place at a constant temperature of 0°C. What is the entropy change of 4 kg of ice while it melts? (Be careful of your energy units).(2 points) Question 9 While water is boiling, it absorbs 2257 kJ of heat per kilogram of water. This takes place at a constant temperature of 100 C. What is the entropy change of 10 kg of water while it boils? (Be careful of your energy units). (2 points) Question 10 To boil methane, you must add 760 kJ of heat per kilogram of methane. If you boil 1 kg of methane, the entropy increases by 6.72 kJ/K. What is the temperature at which methane boils (in Celsius)? (3 points) http)/lacecontent.apexleaming.com/online/physics_sem_ 2_hc_2012/Unit 2/Lesson_2/Activity_71430/printables/Practice_Assignment843144.htm

Explanation / Answer

Q8.

entropy change=heat transferred/temperature

=mass*latent heat of fusion/temperature

=4*334*1000/(273+0) K

=4893.8 J/K

Q9.

entropy change=heat transferred/temperature

=mass*latent heat of boiling/temperature

=10*2257*1000/(273+100) K

=6.051*10^4 J/K

Q10.

heat added=760 kJ

let temperature in kelvin be T K.

entropy change=760*1000/T

==>6.72*1000=760*1000/T

==>T=760/6.72=113.1 K

=-159.9 degree Celsius

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