The heat of combustion of yellow phosphorus and red phosphorus are -9.91 kJ/mol and -8.78 kJ/mol respectively. The heat o f transition from yellow phosphorus to red phosphorus is

Question

The heat of combustion of yellow phosphorus and red phosphorus are -9.91 kJ/mol and -8.78 kJ/mol respectively. The heat o f transition from yellow phosphorus to red phosphorus is (A) - 1.13 kJ (B) -18.69 kJ (C) + 18.69 kJ (D) + 1.13 kJ

Tardigrade Admin · Accepted Answer

P textyellow→ P textred HR=-9.91-[-8.78] = -9.91 + 8 .78 = -1 .13 kJ

Q. The heat of combustion of yellow phosphorus and red phosphorus are $- 9.91 k J / m o l$ and $- 8.78 k J / m o l$ respectively. The heat o f transition from yellow phosphorus to red phosphorus is

$- 1.13 k J$

$- 18.69 k J$

$+ 18.69 k J$

$+ 1.13 k J$

$P_{yellow} \to P_{red}$
$H_{R} = - 9.91 - [- 8.78]$
$= - 9.91 + 8.78 = - 1.13 k J$

Q. The heat of combustion of yellow phosphorus and red phosphorus are −9.91kJ/mol and −8.78kJ/mol respectively. The heat o f transition from yellow phosphorus to red phosphorus is

−1.13kJ

−18.69kJ

+18.69kJ

+1.13kJ