At low temperatures, the specific heats of solids are typically proportional to 73. The first understanding of this behavior was due to the Dutch physicist Peter Debye, who in 1912, treated atomic oscillations with the quantum theory that Max Planck had recently used for radiation. For instance, a good approximation for the specific heat of salt, NaCl, is c = 3.33 104 (32TK). The constant 321 K is called the Debye temperature of NaCl, Op, and the formula works well when T < 0.040p. Using this formula, how much heat is required to raise the temperature of 24.0 g of NaCl from 5 K to 15 K?