When a molecule is broken down into its constituent atoms, these atoms do not have the same properties as the molecule.
We can use an everyday molecule, such as water, H20, to show this property. Water is a liquid with unique properties that stem from its hydrogen bonding. On the other hand, its constituent atoms, hydrogen and oxygen, are not liquids, and have very different properties. Oxygen and hydrogen are both gases; hydrogen is dangerous and very flammable, while we breathe in oxygen throughout our lives. This example illustrates how the atoms that make up a molecule usually have different properties than the completed molecule.
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<span>chemicals reacting are written on the left, what is formed is written on the right after the = sign
eg Copper + oxygen = copper oxide.
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Answer:
Explanation:
SO; If we assume that:
P should be the diffusion of oxygen towards the surface ; &
Q should be the diffusion of carbondioxide away from the surface.
Then the total molar flux of oxygen is illustrated by
:
where;
r is the radial distance from the center of the carbon particle.
Since ;
; we have:
The system is not steady state and the molar flux is not independent of r because the area of mass transfer 
is not a constant term.
Therefore, using quasi steady state assumption, the mass transfer rate 
is assumed to be independent of r at any instant of time.
= constant
The oxygen concentration at the surface of the coal particle 
will be calculated from the reaction at the surface.
The mole fraction of oxygen at a location far from pellet is 1.
Thus, separating the variables and integrating result into the following:
The mole of oxygen arrived at the carbon surface is equal to the mole of oxygen consumed by the chemical reaction.
Obtaining the total gas concentration from the ideal gas law; we have the following:
where;
R= 
The steady state 
molar consumption rate is:
