Answer : If in any reaction ΔH(fusion) is given we can consider its units;
ΔH(transition) has units (KJ/mol) and mass and molecular mass of that compound has unit mol/g and g respectively.
When we solved this, we get the units as KJ/mol which satifies the equation value for q.
So, q=n X ΔH (transition);
Hence, to find the mass of solid we can use the above equation.
<u>Answer:</u> The EMF of the cell is coming when the cell having diluted concentration is getting oxidized.
<u>Explanation:</u>
We are given a cell which contains two 
half cells. This means that the standard electrode potential of the cell will be 0.
For a reaction to be spontaneous, the EMF of the cell must be positive. If the EMF of the cell is negative, the reaction will be non-spontaneous and will not take place.
For a reaction to be spontaneous, the diluted cell must get oxidized.
The half reaction for the given cell follows:
<u>Oxidation half reaction:</u> 
<u>Reduction half reaction:</u> 
Net reaction: 
To calculate the EMF of the cell, we use Nernst equation:
![E_{cell}=E^o_{cell}-\frac{0.0592}{n}\log \frac{[Zn^{2+}_\text{{(diluted)}}]}{[Zn^{2+}_{\text{(concentrated)}}]}](https://tex.z-dn.net/?f=E_%7Bcell%7D%3DE%5Eo_%7Bcell%7D-%5Cfrac%7B0.0592%7D%7Bn%7D%5Clog%20%5Cfrac%7B%5BZn%5E%7B2%2B%7D_%5Ctext%7B%7B%28diluted%29%7D%7D%5D%7D%7B%5BZn%5E%7B2%2B%7D_%7B%5Ctext%7B%28concentrated%29%7D%7D%5D%7D)
where,
n = number of electrons in oxidation-reduction reaction = 2
= ?
![[Zn^{2+}_{\text{(diluted)}}]](https://tex.z-dn.net/?f=%5BZn%5E%7B2%2B%7D_%7B%5Ctext%7B%28diluted%29%7D%7D%5D)
= 
![[Zn^{2+}_{\text{(concentrated)}}]](https://tex.z-dn.net/?f=%5BZn%5E%7B2%2B%7D_%7B%5Ctext%7B%28concentrated%29%7D%7D%5D)
= 2.0 M
Putting values in above equation, we get:
Hence, the EMF of the cell is coming when the cell having diluted concentration is getting oxidized.
Answer:
oxidation-reduction reaction or redox reaction.
Explanation:
If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained
Una mezcla homogenea es una mezcla solida, liquida o gaseosa que tiene las mismas proporciones de sus componentes en cualquier muestra dada. A la inversa, una mezcla heterogenea tiene componentes cuyas proporciones varian a lo largo de la muestra. "Homogeneo" y "heterogeneo" no son terminos absolutos sino que dependen del contexto y del tamano de la muestra. En quimica, una suspension homogenea de material significa que cuando se divide el volumen a la mitad, la misma cantidad de material se suspende en ambas mitades de la sustancia; sin embargo, podria ser posible ver las particulas bajo un microscopio. Un ejemplo de una mezcla homogenea es el aire.
