EBK CHEMISTRY: AN ATOMS FIRST APPROACH
2nd Edition
ISBN: 9780100552234
Author: ZUMDAHL
Publisher: YUZU
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Textbook Question
Chapter 9, Problem 109AE
Some of the physical properties of H2O and D2O are as follows:
| Property | H2O | D2O |
| Density at 20°C (g/ml) | 0.997 | 1.108 |
| Boiling point (°C) | 100.00 | 101.41 |
| Melting point (°C) | 0.00 | 3.79 |
| ∆H°vap(kJ/mol) | 40.7 | 41.61 |
| ∆H°fus (kJ/mol) | 6.02 | 6.3 |
Account for the differences. (Note: D is a symbol often used for 2H, the deuterium isotope of hydrogen.)
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Data Table
Description of Data
Trial 1
Trial 2
(include units)
(include units)
Mass of reaction mixture
1.039
1.029
Percentage of KCIO3 in mixture (see label on bottle)
90%.
907.
Mass of clean, dry delivery 400 mL beaker
137.899
137.89 9
Mass of beaker + water
410. 01g
408. 79 g
Temperature of water
20.3 C
20.3C
Barometric
pressure
767.5
767.5
Pressure of water vapor nearest to the measured
Ib.5
I lo.5
temperature (see Table 1)
Data Analysis
Write each calculation below, using data from the data table, or a result from a previous
calculation.
1. Calculate the actual mass of KCIO3 that reacted in each trial, by multiplying the mass of
your reaction mixture by the percentage of KCIO3 in the mixture. Record (your answer) the
actual mass of KCIO3 used in each trial in the Results Table on the report sheet. Show a
sample calculation below.
TRIAL I
i. 03g
X 90
0.9279
100
90
1. 029 Y
: 0.918 9
TRIAL 2:
100
The following information is given for manganese at 1atm:
boiling point = 2095 °C
Hvap(2095 °C) = 225 kJ/mol
melting point = 1244 °C
Hfus(1244 °C) = 14.6 kJ/mol
specific heat solid= 0.477 J/g°C
specific heat liquid = 0.837 J/g°C
What is H in kJ for the process of freezing a 47.4 g sample of liquid manganese at its normal melting point of 1244 °C.
Chapter 9 Solutions
EBK CHEMISTRY: AN ATOMS FIRST APPROACH
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