Chapter 12, Problem 58
Which evaporates more quickly: 100 mL of water (H2O) in a beaker or 100 mL of acetone [(CH3)2CO] in an identical beaker under identical conditions? Is the vapor pressure of the two substances different? Explain.
Video transcript
Which compound would you expect to have greater surface tension: acetone [(CH3)2CO] or water (H2O)? Explain.
Explain why the viscosity of multigrade motor oils is less temperature-dependent than that of single-grade motor oils.
When a thin glass tube is put into water, the water rises 1.4 cm. When the same tube is put into hexane, the hexane rises only 0.4 cm. Explain.
Suppose that 0.95 g of water condenses on a 75.0-g block of iron that is initially at 22 °C. If the heat released during condensation goes only to warming the iron block, what is the final temperature (in °C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/mol.)
This table displays the vapor pressure of ammonia at several different temperatures. Use the data to determine the heat of vaporization and normal boiling point of ammonia.
Temperature (K) Pressure (torr)
200 65.3
210 134.3
220 255.7
230 456.0
235 597.0
Ethanol has a heat of vaporization of 38.56 kJ>mol and a normal boiling point of 78.4 °C. What is the vapor pressure of ethanol at 15 °C?