{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

1178564611Xuj

# 1178564611Xuj - Anderson Kiel Homework 3 Due midnight Inst...

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

Anderson, Kiel – Homework 3 – Due: Feb 18 2007, midnight – Inst: McCord 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points An equilibrium in which processes occur con- tinuously, with NO NET change, is called 1. dynamic equilibrium. correct 2. heterogeneous equilibrium. 3. static equilibrium. 4. homogeneous equilibrium. Explanation: For a system at dynamic equilibrium, al- though the concentrations of the components do not change, the processes continue to oc- cur in the foward and reverse directions at the same rate. 002 (part 1 of 1) 10 points Explain why equilibium constants are dimen- sionless. 1. Every concentration or pressure that en- ters into K c or K p is really divided by the cor- responding concentration or pressure of the substance in its standard state. correct 2. They are dimensionless because concen- trations and pressures have no units. 3. They are not really dimensionless but we must treat them as such in order to be able to take ln K in the expression Δ G 0 = - R T ln K . 4. They are dimensionless because the pres- sures or concentrations we put in are all for the substances in their standard states. 5. The statement is not true. Equilibrium constants have units that involve some multi- ple of atmospheres or moles per liter. Explanation: The amount of each component is in terms of activity, which is the measured amount (concentration, pressure) divided by the amount of that component in its standard state in that unit. The units in the numera- tor and denominator are identical and cancel out. 003 (part 1 of 1) 10 points Consider the reaction 2 HgO(s) * ) 2 Hg( ) + O 2 (g) . What is the form of the equilibrium constant K c for the reaction? 1. None of the other answers is correct. 2. K c = [O 2 ] [HgO] 2 3. K c = [Hg] 2 [O 2 ] 4. K c = [Hg] 2 [O 2 ] [HgO] 2 5. K c = [O 2 ] correct Explanation: Solids and liquids are not included in the K expression.

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 / 6

1178564611Xuj - Anderson Kiel Homework 3 Due midnight Inst...

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

View Full Document
Ask a homework question - tutors are online