There are 118 elements in the periodic table.
Answer:
Oxidation process
Explanation:
Oxidation is the transfer of electrons from an atom, molecule, or ion to another atom, molecule, or ion in a chemical reaction.
Oxidation is said to have taken place when the oxidation status of a atom, molecule, or ion is increases.
Oxidation process is said to include
Addition of oxygen atom or Electronegative atoms to another atom, molecule, or ion
Loss of one or more electrons by a atom, molecule, or ion
Increase in the oxidation number of a atom, molecule, or ion
Loss of a hydrogen or Electropositive atoms
Answer : The molecular formula of benzoyl peroxide is 
Explanation :
Empirical formula : It is the simplest form of the chemical formula which depicts the whole number of atoms of each element present in the compound.
Molecular formula : it is the chemical formula which depicts the actual number of atoms of each element present in the compound.
For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.
The equation used to calculate the valency is :
As we are given that the molar mass of compound is, 0.242 kg/mol.
Molecular mass = 0.242 kg/mol = 242 g/mol (1 kg = 1000 g)
The empirical mass of 
= 7(12) + 5(1) + 2(16) = 121 g/eq
Molecular formula = 
= 
=
Thus, the molecular formula of benzoyl peroxide is
Answer:
E) 2.38
Explanation:
The pH of any solution , helps to determine the acidic strength of the solution ,
i.e. ,
- Lower the value of pH , higher is its acidic strength
and ,
- Higher the value of pH , lower is its acidic strength .
pH is given as the negative log of the concentration of H⁺ ions ,
hence ,
pH = - log H⁺
From the question ,
the concentration of the solution is 0.0042 M , and being it a strong acid , dissociates completely to its respective ions ,
Therefore , the concentration of H⁺ = 0.0042 M .
Hence , using the above equation , the value of pH can be calculated as follows -
pH = - log H⁺
pH = - log ( 0.0042 M )
pH = 2.38 .
