{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

SUPPL INSTR FOR CH 302 (GE 206E) - HW1SOL

# SUPPL INSTR FOR CH 302 (GE 206E) - HW1SOL - Moore Robert...

This preview shows pages 1–2. Sign up to view the full content.

Moore, Robert – Homework 1 – Due: Jan 26 2007, midnight – Inst: McCord 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. This homework has some Chapter 7 ques- tions and then gets into Chapter 8. You should recognize the frst question as an isothermal expansion which is discussed in both Chapter 6 and in Chapter 7. 001 (part 1 oF 1) 10 points Calculate ΔG For the process He(g , 1 atm , 298 K) He(g, 10 atm, 298 K) 1. 5.70 kJ/mol correct 2. 3.50 kJ/mol 3. 3.90 kJ/mol 4. 4.80 kJ/mol 5. 2.10 kJ/mol Explanation: 002 (part 1 oF 1) 10 points A reversible reaction is at equilibrium at con- stant pressure and temperature iF the Free energy oF the system 1. is a maximum. 2. increases. 3. is a minimum. correct 4. is zero. 5. decreases. Explanation: A system is at equilibrium when Δ G = 0. A system is spontaneous when Δ G is negative and non-spontaneous when Δ G is positive. Call Gibbs ±ree Energy at equilibrium G equil . IF the system moves towards spontane- ity, G equil < G spont For Δ G to be negative. ThreFore, Δ G equil must be a minimum. 003 (part 1 oF 1) 10 points A reaction For which Δ H is positive and Δ S is negative 1. is spontaneous at any temperature. 2. could become spontaneous at high tem- peratures. 3. is not spontaneous at any temperature. correct 4. could become spontaneous at low temper- atures. Explanation: T = (+) , Δ H = (+) and Δ S = ( - ) Δ G = Δ H - T Δ S Δ G = (+) - (+)( - ) = (+) - ( - ) = (+) + (+) Δ G will always be positive, so the process will always be nonspontaneous. 004 (part 1 oF 1) 10 points Liquid metallic zinc (Zn) has a vapor pressure oF 40 torr at 673 C and 100 torr at 736 C.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

SUPPL INSTR FOR CH 302 (GE 206E) - HW1SOL - Moore Robert...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online