Answer:
to find the number of electrons you need the charge of the element.
C. The number of protons in the atoms nucleus.
KOH -------> K+ OH-
Ba(OH)2 ------> Ba+2. 2OH-
Explanation:
The given data is as follows.
Thickness (dx) = 0.87 m, thermal conductivity (k) = 13 W/m-K
Surface area (A) = 5
, 
According to Fourier's law,
Q = 
Hence, putting the given values into the above formula as follows.
Q = 
= 
= 5902.298 W
Therefore, we can conclude that the rate of heat transfer is 5902.298 W.