Two bars of different metals are heated to and then immersed in identical, insulated containers each — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

According to the Dulong-Petit law, the molar heat capacity of solid elements is approximately constant ($3R$). Consequently, a metal with a lower atomic mass has a higher specific heat capacity (heat capacity per gram). For equal masses, the lower atomic mass metal holds more heat and thus transfers more heat to the water, causing a greater temperature rise.