Using Table and the specific heat of water, 4.184 J/g °C, calculate the total amount of heat for each of the following:
a. joules needed to warm 20.0 g of water at 15 °C to 72 °C
b. joules needed to melt 50.0 g of ice at 0.0 °C and to warm the liquid to 65.0 °C
c. kilojoules released when 15.0 g of steam condenses at 100 °C and the liquid cools to 0 °C
d. kilojoules needed to melt 24.0 g of ice at 0 °C, warm the liquid to 100 °C, and change it to steam at 100 °C
Table
| Heats of Fusion and Heats of Vaporization for Selected Substances | ||||
Liquid | Formula | Melting point (°C) | Heat of Fusion (J/g) | Boiling point (°C) | heat of Vaporization (J/g) |
Water | H2O | 0 | 334 | 100 | 2260 |
Ethanol | C2H5OH | −114 | 109 | 78 | 841 |
Ammonia | NH3 | −78 | 351 | −33 | 1380 |
Acetone | C3H6O | −95 | 99.3 | 56 | 335 |
Acetic acid | C2H4O2 | 17 | 192 | 118 | 390 |
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