Question

The latent heatsof fusion in $J{g}^{-1}$ of five substances a (mol.mass =18); b(mol.mass =20); c(mol.mass =30), d(mol.mass =60) and e(mol.mass =30) are respectively $80,45,90,45,45$. Which of the following pair has same value of $\Delta H_{fusion}$?

• A. a,c
• B. b,e
• C. d,e
• D. c,d

Answer 1

The correct option is D c,d

${\Delta H}_{fusion}$ for following compounds is given below :-

1) $a=18\times 80=1440J$

2) $b=20\times 45=900J$

3) $c=30\times 90=2700J$ } $c$ & $d$ have same value of ${\Delta H}_{fusion}$.

4) $d=60\times 45=2700J$

5) $e=30\times 45=1350J$