Physical Chemistry
2nd Edition
ISBN: 9781133958437
Author: Ball, David W. (david Warren), BAER, Tomas
Publisher: Wadsworth Cengage Learning,
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Chapter 2, Problem 2.13E
Liquid hydrogen fluoride, liquid water, and liquid ammonia all have relatively high specific heats for such small molecules. Speculate as to why this might be so.
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A pure sample of Substance S is put into an evacuated flask. The flask is then heated steadily and the temperature measured as time passes. The results are
graphed below, in the middle (in green).
Identical experiments are now run on Substance Y and Substance Z. Substance Y is just like S except that it has a higher heat capacity in the solid phase
Cs). Substance Z is just like S except that it has a lower heat capacity in the gaseous phase C,g).
Select the graphs below, on the left and right, that show the results you expect for these new experiments.
db
Substance Y
Substance Z
(higher C,(3))
Substance S
(lower C,(g)
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choose an image)
(Drag the slider to
choose an image)
orddad hest (lT/mnl
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temperature (°C
Interpreting a heating curve.
A pure sample of Substance S is put into an evacuated flask. The flask is then heated steadily and the temperature measured as time passes. The results are
graphed below, in the middle (in green).
Identical experiments are now run on Substance Y and Substance Z. Substance Y is just like S except that it has a lower heat capacity in the gaseous phase
C,(g). Substance Z is just like S except that it has a lower enthalpy of vaporization AH,
Select the graphs below, on the left and right, that show the results you expect for these new experiments.
Substance Y
(lower C,(e))
Substance S
Substance Z
(lower AH)
(Drag the slider to
choose an image)
(Drag the slider to
choose an image)
added heat (kJ/mol)
Explanation
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temperature (°C)
Chapter 2 Solutions
Physical Chemistry
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- Although the gas used in an oxyacetylene torch (Figure 5.7) is essentially pure acetylene, the heat produced by combustion of one mole of acetylene in such a torch is likely not equal to the enthalpy of combustion of acetylene listed in Table 5.2. Considering the conditions for which the tabulated data are reported, suggest an explanation.arrow_forwardA compound is 82.7% carbon and 17.3% hydrogen, and has a molar mass of approximately 60 g/mol. When 1.000 g of this compound burns in excess oxygen, the enthalpy change is 49.53 kJ. (a) What is the empirical formula of this compound? (b) What is the molecular formula of this compound? (c) What is the standard enthalpy of formation of this compound? (d) Two compounds that have this molecular formula appear in Appendix G. Which one was used in this exercise?arrow_forwardHow much heat is produced by combustion of 125 g of methanol under standard state conditions?arrow_forward
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