Calculate the energy, in joules and calories, for each of the following (see Table 2.8):
a. required to heat 25.0 g of water from 12.5 °C to 25.7 °C
b. required to heat 38.0 g of copper from 122 °C to 246 °C
c. lost when 15.0 g of ethanol cools from 60.5 °C to −42.0 °C
d. lost when 112 g of iron cools from 118 °C to 55 °C
TABLE 2.8 Specific Heats of Some Substances
Substance | (J/g °C) | (Cal/g °C) |
Elements | ||
Aluminum, Al(s) | 0.897 | 0.214 |
Copper, Cus(s) | 0.385 | 0.0920 |
Gold, Au(s) | 0.129 | 0.0308 |
Iron, Fe(s) | 0.452 | 0.108 |
Silver, Ag(s) | 0.235 | 0.0562 |
Titanium, Ti(s) | 0.523 | 0.125 |
Compounds | ||
Ammonia, NH3(g) | 2.04 | 0.488 |
Ethanol, C2H5OH(l) | 2.46 | 0.588 |
Sodium chloride, NACL(s) | 0.864 | 0.207 |
Water, H2Ol | 4.184 | 1.00 |
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