Name:  _____________________                              date:  __________________               period: _______

Ch. 10 & 14 thermodynamics             test                  60 points                      chemistry

In problems involving any calculation, show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

1. Based on the following (hypothetical ?) experimental data

# g container =

2.00 g

# g container + sodium hydroxide =

5.82 g

Water; initial temperature =

21.0 ºC

Water; final temperature =

30.8 ºC

Water; volume =

95.0 mL

what is the ΔH (in kJ / mol) to dissolve solid sodium hydroxide in water ?   [`10 points]

2. Based on thermodynamic principles, estimate the boiling point of water.  [10 points]

3. The complete combustion (assume all products are gases) of 2.0 mL of methanol, CH3OH, heated 250. g of water at 21.0 ºC.  Assume that the density of methanol is 0.80 g / mL; what is the final temperature of the water ?  [20 points]

4. What is ΔS for the reaction ?  justify / rationalize your response.  [20 points]

a. dissolve solid ammonium nitrate in water, which is an endothermic reaction

b. sublimation of dry ice, solid carbon dioxide

c.  PCl3(g)  +  Cl2(g)  -->  PCl5(g)

d.  dissolve solid sodium hydroxide in water, which is an exothermic reaction