12. An ideal gas undergoes an isothermal expansion at 77 °C, increasing its volume from1.3 to 3.41. The entropy change of the gas is 24 J/K. How many moles of gas arepresent?a. 3 molesb. 5 molesc. 7 molesd. 9 moles 11. A Carnot heat engine is 20% efficient. If the temperature of hot reservoir is 227 °C thenwhat will be the temperature of the cold reservoir.а. 127°Сb. 157 °Cс. 200 °Сd. 220 °C

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12. An ideal gas undergoes an isothermal expansion at 77 °C, increasing its volume from 1.3 to 3.41. The entropy change of the gas is 24 J/K. How many moles of gas are present? a. 3 moles b. 5 moles c. 7 moles d. 9 moles

12. An ideal gas undergoes an isothermal expansion at 77 °C, increasing its volume from 1.3 to 3.41. The entropy change of the gas is 24 J/K. How many moles of gas are present? a. 3 moles b. 5 moles c. 7 moles d. 9 moles

College Physics

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ISBN:9781305952300

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Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

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12. An ideal gas undergoes an isothermal expansion at 77 °C, increasing its volume from
1.3 to 3.41. The entropy change of the gas is 24 J/K. How many moles of gas are
present?
a. 3 moles
b. 5 moles
c. 7 moles
d. 9 moles

11. A Carnot heat engine is 20% efficient. If the temperature of hot reservoir is 227 °C then
what will be the temperature of the cold reservoir.
а. 127°С
b. 157 °C
с. 200 °С
d. 220 °C

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