JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
The correct order of molar heat capacities measured at \(298\text{ K}\) and \(1\text{ bar}\) is :
- A Copper(s) > Bromine(l) > Helium(g)
- B Bromine(l) > Copper(s) > Helium(g)
- C Helium(g) > Bromine(l) > Copper(s)
- D Helium(g) > Bromine(l) = Copper(s)
Answer & Solution
Correct Answer
(B) Bromine(l) > Copper(s) > Helium(g)
Step-by-step Solution
Detailed explanation
The molar heat capacity of Helium (a monatomic gas) at constant pressure is \(C_p = \dfrac{5}{2}R \approx 20.8 \text{ J K}^{-1} \text{ mol}^{-1}\). The molar heat capacity of Copper (a solid) follows the Dulong-Petit law, which gives…
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