Answer:
Q = [tex]\frac{T1 - T2}{R}[/tex]
Explanation:
First, a steady state heat transfer system needs to be drawn. After that, some assumptions need to be made in order for the model to be feasible:
1. Stead state heat transfer.
2. The heat transfer takes place in a one-dimensional symmetry about the midpoint of the sphere.
3. The combined heat transfer coefficient is constant and uniform.
4. The process is isothermal, there is no change in temperature: convection and internal resistance can be ignored.
Change in heat = heat in - heat out + heat generated - heat of reaction
Nitrogen is inert, so heat of reaction is zero.
Q = mh (where h is the heat of evaporation)
Q = [tex]\frac{T1 - T2}{R}[/tex]
