(delta H_f of CO_2 (g) = -393.5 kj/mol; deltaH_f of H_2O(l) = -285.8 kj/mol; del

Question

(delta H_f of CO_2 (g) = -393.5 kj/mol; deltaH_f of H_2O(l) = -285.8 kj/mol; deltaH_f of O_2(g) = 0 kj/mol) Fill-in the blanks Law of thermodynamics state, it is impossible to convert heat completely to__________The four components of use of energy are classified as i) residential, ii) commercial, industrial and iv)_______In the United states, half of the domestic energy use goes into produung________. Enthalpy change equal the heat flow at constant_______________is defined by (Q/T) in the Camot cycle

Explanation / Answer

i). The second law thermodynamics states that it is impossible to convert heat completely to work (ie with 100% efficiency)

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ii)    (iv) The fourth component of use of energy is Transportation

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iii) In the United States, half of the domestic energy use goes into space heating and water heating

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iv) Heat changes can occur either at constant pressure conditions or constant volume conditions

Heat change at constant pressure conditions is called the enthalpy change Delta H.

Heat change at constant volume conditions is called the internal energy change Delta E.

Answer: Enthalpy change equals heat flow at constant pressure.

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v) ENTROPY is defined by Q/T in the Carnot's cycle.

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