Use the heat equation to calculate the energy, in joules, for each of the following (see Table):
a. lost when 75.0 g of water, H2O, cools from 86.4 °C to 2.1 °C
b. lost when 18.0 g of gold (Au) cools from 224 °C to 118 °C
Table
| Substance | Specific Heat (J/g °C) |
Elements | Aluminium, Al(s) | 0.897 |
Copper, Cu(s) | 0.385 | |
Gold, Au(s) | 0.129 | |
Iron, Fe(s) | 0.452 | |
Silver, Ag(s) | 0.235 | |
Titanium, Ti(s) | 0.523 | |
Components | NH3(g) | 2.04 |
Ethanol, C2H5OH(l) | 2.46 | |
Sodium Chloride, NaCl(s) | 0.864 | |
Water, H2O(l) | 4.184 | |
Water, H2O(s) | 2.03 |
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