Some Helps with the Concepts! Thermodynamics of Material Engineering. 14. At con

Question

Some Helps with the Concepts!

Thermodynamics of Material Engineering.

14. At constant pressure, which of the following is true? (b) enthalpy is equivalent to heat, (a) enthalpy is equivalent to work, (c) enthalpy is equivalent to Gibbs free energy,(d) enthalpy is equivalent to internal energy (e) enthalpy is equivalent to entropy. 15, The n is heat of formation of a solution, which of the following expression is correct? (c) HM.ideal = 0 (a)aHM.ideaSo (b) "ideal0 (d)aHM-ideal = 6"ideal (e) HMidea.ASM.ideal 16. For a multicomponent solution, which of the following expression is correct? Q, represents extensive property 17. Regarding entropy change of the formation of an ideal solution, which of the following statement is correct? The entropy change (a) is due to the spatial rearrangement only (c) is always equal to enthalpy change (e) is zero at 0°c. (b) is a function of pressure only (d) is not related to the spatial situation

Explanation / Answer

Ans 14 b) enthalpy is equivalent to heat

When the pressure is constant , the enthalpy of the system is equal to the heat absorbed or given off by the system.

So usually when the pressure is constant in most of the chemical reactions , the heat of the reaction is often measured by the change in enthalpy.

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