SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY
SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY
DEPARTMENT OF MATERIALS AND METALLURGICAL ENGINEERING
MET 320 HQ 3 Nov. 12,1999
1. Write the Fundamental Equations for a closed system.
2. One mole of liquid Hg mixes with 9 moles of liquid Ga to form a liquid alloy. What is the configurational entropy change for the mixing process?
3. At what pressure would the melting temperature of Pb be reduced by 1 one Kelvin degree to 599 K. The densities of Pb(s) and Pb(l) are 10.5 and 10.3 g/cm3, respectively. The heat of fusion for Pb is 4794 J/gmole and its molecular weight is 207.
4. At Base Camp on your ascent of Mt. Everest you note that the water for your tea boils at boils at 90 oC. What is the barometric pressure? The heat of vaporization of water is 40,680 J/gmole.
5. Find the adiabatic flame temperature for the combustion of C2H2. With air (21% O2 and 79% N2). The air and the C2H2 start at 298°K. Use the data provided below only.
C2H2 (g)+ 2.5O2(g) = 2CO2 (g) + H2O(g)
Species Heats of Formation Cp
(Calories/g mole at 298°K) (cal/ gmole °K)
C2H2(g) 54,190 19.0
H2O(g) -57,800 10.5
CO2(g) -94,000 13.6
O2(g) 8.6
N2(g) 7.0
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