Vandenbout Worksheet 2

# Vandenbout Worksheet 2 - WorkSheet 2 ...

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Unformatted text preview: WorkSheet 2 Physical Equilibria 1. Why would it be better to calibrate a thermometer using the temperature at the triple point versus the temperature at the melting point? 2. What is a critical point on a phase diagram? 3. Is the following the Claussius ­Claperyon equation? ȹ P ȹ ΔH vap Ⱥ 1 1 Ⱥ lnȹ 1 ȹ = Ⱥ − Ⱥ R Ⱥ T2 T1 Ⱥ ȹ P2 Ⱥ 4. Ethanol C2H5OH and dimethyl ether CH3OCH3 have the same molecular weight (the same atomic makeup actually). What are the IMF you would find in each? € Which do you think would have the higher vapor pressure at 25°C? Which do you think has the higher normal boiling point? 5. Why does water boil at a lower temperature in Denver? 6. Which phase transition are exothermic? 7 What information would you need to know to determine the amount of heat required to take a block of iron from 500 °C to liquid iron at 1800 °C? 8. Find a phase diagram and navigate around it with a friend. 9. Why is there no phase transition between a gas and a SCF? 10. Iodine sublimes at 298 K. Based on this do you expect the triple point to be at a higher or lower temperature? Or does it depend on the pressure? 11. The vapor pressure of ethanol at 35°C is 0.132 atm. 10 g of liquid ethanol are placed into a 10L container at a constant temperature of 35°C and allowed to come to equilibrium. How many grams of liquid remain after the system comes to equilibrium (if any)? ...
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