Question

What is the heat capacity of Na2SO4.10H2O at room temperature using Kopp’s rule?

• A. 325.4
• B. 501.9
• C. 65.44
• D. 177.90

Hint:

Kopp's rule is useful for estimating the heat capacity of compounds when individual atomic heat capacities are available. This is commonly used for complex compounds like hydrates.

Answer 1

The Correct Option is B

- Kopp's rule states that the heat capacity of a compound is the sum of the heat capacities of its constituent atoms. 
- The atomic heat capacities of Na, S, O, and H are 26.04, 22.6, 16.8, and 9.6 J/g-atomK, respectively. - For Na2SO4.10H2O, the contribution is calculated by multiplying the atomic heat capacities with the respective number of atoms in the compoun(D) 
- The total heat capacity at room temperature is 501.9 J/mol-K. 
Conclusion: 
The heat capacity of Na2SO4.10H2O is 501.9, as given by option (B).