Some Helps with the Concepts! Thermodynamics of Material Engineering. 12. From,

Question

Some Helps with the Concepts!

Thermodynamics of Material Engineering.

12. From, Co(s) + (1/2) 02(g) = COO(s), DG = -233,900 + 71.85 TJ (298K-2000K), when the mixture of Co and Coo equilibrates at 800°C, what would you do if you need to obtain more Co0, (a) lower the temperature to below 800°C (b) increase the temperature to above 800°C (c) added NiO into the mixture enthalpy (d) remove some oxygen (e) decrease the oxygen pressure 13. When you plot a P-T phase diagram for a unique substance, the slope for liquid solid boundary on its P-T diagram is negative, it indicates (a) the density of solid is higher than liquid (b) there is volume increase when it melts (c) the solid will sink in liquid (d) it needs heat to solidify (e) there is volume expansion when it solidifies. 14. Which of the following relations is incorrect? (a) , = T ), (b) , = (), (c) Cy = T(H), (d) cy = (6), (e) ay = (1), 15. For most of non-metallic solids, the specific heat C, at extremely low temperature (i.e. T-OK) is proportional to: (a)T (b) ? (C)T (d) r (e) 79

Explanation / Answer

Ans 12 : b) increase the temperature to above 800oC

the reaction has a positive enthalpy of reaction , which indicates that it is an endothermic reaction. So is the equillibrium is maintained at 800oC , increasing the temperature above 800oC , will increase the equillibrium constant and shift the reaction towards right , favoring the production of more products i.e. CoO

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