DATA Phase Cp = a+bT + c/T² + dT² (J/mole-K)* AH trans(kJ/mole) Trans(K) a b.103 c⚫10-5 d⚫106 Ti-hex** 24.94 6.57 -1.63 1.34 4.20 1155 Ti-bcc 30.84 -8.87 0 6.44 16.70 1943 Ti-liq 41.84 Ti-gas*** (Cp from 298-3000K) 22.26 -3.26 2.13 2.76 * Cp equation valid for T at which phase is most stable form of the substance. Ti-hex at 298K: AH₁ = 0 kJ/mole, S298 = 30.7 J/mole-K *** Ti-gas at 298K: AH₁ = 473.6 kJ/mole, S298 = 180.2 J/mole-K Values for future use C 29.35 12.72 TiC 110.58 16.13 TiC(s) AH298[TiC,s] = -366,650 J/mol
What is the enthalpy change upon transforming 2 moles of Ti(hex) from 298K
into Ti(bcc) at 1600K?
• What is the entropy change upon transforming 2 moles of Ti(hex) from 298K into
Ti(bcc) at 1600K?
• What is the absolute entropy of 1 mole of Ti(bcc) at 1600K?
• What is the enthalpy change for transforming 1 mole of Ti(g) from 1600K into
Ti(bcc) at 1200K?
• Develop a general temperature-dependent enthalpy equation for Ti(bcc) which
is valid for temperatures between 1155K and 1943K. This equation should be
general with a form similar to: [HT(Ti,bcc) - H1155(Ti,bcc)] = A + B•T + C•T2 + D/
T + E•T3
• What is the enthalpy of vaporization of 1 mole of Ti(bcc) to Ti(g) at 1600K?
• What is the entropy of vaporization of 1 mole of Ti(bcc) to Ti(g) at 1600K?
• What is the enthalpy of vaporization of 1 mole of Ti(hex) to Ti(g) at 298K?
• What is the entropy of vaporization of 1 mole of Ti(hex) to Ti(g) at 298K?
![DATA
Phase
Cp = a+bT + c/T² + dT² (J/mole-K)*
AH trans(kJ/mole)
Trans(K)
a
b.103
c⚫10-5
d⚫106
Ti-hex**
24.94
6.57
-1.63
1.34
4.20
1155
Ti-bcc
30.84
-8.87
0
6.44
16.70
1943
Ti-liq
41.84
Ti-gas*** (Cp from 298-3000K)
22.26
-3.26
2.13
2.76
*
Cp equation valid for T at which phase is most stable form of the substance.
Ti-hex at 298K: AH₁ = 0 kJ/mole, S298 = 30.7 J/mole-K
*** Ti-gas at 298K: AH₁ = 473.6 kJ/mole, S298 = 180.2 J/mole-K
Values for future use
C
29.35
12.72
TiC
110.58
16.13
TiC(s) AH298[TiC,s] = -366,650 J/mol](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8b5ae672-5f2a-4063-988c-e6f12e1beb1d%2F3343bfd1-10bf-4d0c-a34d-aa63dcc85547%2Fu7d6q7_processed.png&w=3840&q=75)
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