# CHEM 161 – 01 CHAPTER 6 Homework 2

CHEM 161 – 01CHAPTER 6Homework 2Intermolecular ForcesName:_________________________________Due Thursday January 21 2016Work the following problems on your own paper. Please staple your pages together before handing theproblem set in. Each problem is worth 5 points for a maximum of 20 points. Each problem is gradedholistically on a scale of 0 – 5 based on accuracy and completeness.1. Refer to the following phase diagram and answer the following questions:a.b.c.d.e.Which phase(s) occur at point B?Which phase(s) occur at point D?Which phase(s) occur when the pressure is 1.00 atm and temperature of 32°C?What is the normal melting point of the substance?From this phase diagram which phase is most dense (A B or C)?Refer to Chapter 9 Section 4 for additional help with Problems 2 – 4.2. Water has a normal boiling point of 100.0C and a normal freezing point of 0.00C. Thespecific heats of the solid liquid and vapor are 2.09 J/g-°C 4.184 J/g-°C and 2.03 J/g°C respectively. The heats of fusion and vaporization for water are 334 J/g and 2260 J/g respectively.a.b.How much heat (kJ) is need to vaporize 2.50 mol H2O at its normal boilingpoint?How much heat is needed to raise the temperature of 5.00 kg of water from10.0 °C to 85.0 °C?3. Benzene (C6H6) has a normal boiling point of 80.1 C. How much energy (in kJ) wouldbe required to change 450.0 g of liquid benzene at 21.5 C to a vapor at its boiling point?The specific heat of liquid benzene is 1.74 J/g-°C and its heat of vaporization is 395 J/g.4. The specific heat of silver is 0.237 J/g-C and its melting point is 961 C. Its heat offusion is 11 J/g. How much heat is needed to change 9.72 g of silver from solid at 24 Cto liquid at 961 C?

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