Answer:
C. 3
Explanation:
volume = length×width×height
3×3×3=27
By the addition or removal of electrons from a stable atom or molecule
Answer: If 
for a reaction equals zero, the reaction is at equilibrium.
Explanation:
When a thermodynamic closed system tends to do the maximum amount of non-expansion work then the energy used to do this work is called Gibb's free energy.
The expression for can be written as follows.
where,
= enthalpy change
T = temperature
= entropy change
This means that is the difference between heat released in a process and the amount of heat released in a reversible manner for the same process. So, when the value of of comes out to be equal to zero then it means no heat is released or absorbed.
Hence, the reaction is stable or at equilibrium.
Thus, we can conclude that the value of = 0 then it means that the reaction is at equilibrium.
The three include Solids, Liquids, and Gases
When energy is needed in order for the reaction to happen, then that reaction is known as endotermic. When the reaction has as a result energy then it is exotermic. An example of an endotermic reaction would be photosynthesis, for an exotermic: combustion.
