Answer
Verified
396k+ views
Hint: The given reaction is a type of decomposition reaction. The equivalent weight of a molecule can be calculated as its molecular weight divided by the number of electrons transferred by that reactant. By using this data one can find an approach to find the solution.
Complete step by step answer:
1) In the above reaction hydrogen peroxide is decomposed into water and oxygen molecules. By applying the definition of equivalent weight we get the following formula,
\[{\text{Equivalent weight = }}\dfrac{{{\text{Molecular weight}}}}{{{\text{Number of electrons transferred per mole of reactant}}}}\]
Which also can be written in short as, ${\text{Equivalent weight = }}\dfrac{{MM}}{n}$
2) To find out the number of electrons transferred per mole of reactant we need to find out based on the ion-electron method by balanced equation method as follows,
The unbalanced equation for the reaction,
${H_2}{O_2} \to {H_2}O + {O_2}$
The equation for reduction reaction, $1 \times \left[ {{H_2}{O_2} + 2{H^ + } + 2{e^ - } \to 2{H_2}O} \right]$
The equation for oxidation reaction, $1 \times \left[ {{H_2}{O_2} \to {O_2} + 2{H^ + } + 2{e^ - }} \right]$
Hence, the balanced equation, $\overline {2{H_2}{O_2} \to {O_2} + 2{H_2}O} $
As we have observed in the above reaction there is a transfer of two electrons.
3) The reaction involves the 2 moles ${H_2}{O_2}$. So, to find out the number of electrons used per mole of molecule ${H_2}{O_2}$ we can use the equation for n,
$n = \dfrac{{{\text{number of electrons transferred}}}}{{{\text{number of moles of molecule}}}}$
$n = \dfrac{{2{e^ - }}}{{2{\text{ mol }}{H_2}{O_2}}} = 1$
Therefore, $1{e^ - }$ is used per $1$ mol of ${H_2}{O_2}$
4) Next, we need to find out the molecular weight for ${H_2}{O_2}$,
${\text{Molecular weight of }}{{\text{H}}_2}{{\text{O}}_2} = 2 \times 1 + 2 \times 16 = 34g$
Hence, the calculated molecular weight of the molecule ${H_2}{O_2}$ is $34g$
Now after getting the necessary values and putting it in the equation we can calculate the equivalent weight,
${\text{Equivalent weight = }}\dfrac{{MM}}{n} = \dfrac{{34g}}{1} = 34g$
Hence, option A is marked as the correct choice.
Note:
The equivalent weight of a molecule can also be defined as the amount of that molecule which exactly reacts with another random molecule’s fixed quantity. Whenever the number of electrons transferred and the number of moles of the molecule is the same then the equivalent weight will be the same as the molecular weight of the molecule.
Complete step by step answer:
1) In the above reaction hydrogen peroxide is decomposed into water and oxygen molecules. By applying the definition of equivalent weight we get the following formula,
\[{\text{Equivalent weight = }}\dfrac{{{\text{Molecular weight}}}}{{{\text{Number of electrons transferred per mole of reactant}}}}\]
Which also can be written in short as, ${\text{Equivalent weight = }}\dfrac{{MM}}{n}$
2) To find out the number of electrons transferred per mole of reactant we need to find out based on the ion-electron method by balanced equation method as follows,
The unbalanced equation for the reaction,
${H_2}{O_2} \to {H_2}O + {O_2}$
The equation for reduction reaction, $1 \times \left[ {{H_2}{O_2} + 2{H^ + } + 2{e^ - } \to 2{H_2}O} \right]$
The equation for oxidation reaction, $1 \times \left[ {{H_2}{O_2} \to {O_2} + 2{H^ + } + 2{e^ - }} \right]$
Hence, the balanced equation, $\overline {2{H_2}{O_2} \to {O_2} + 2{H_2}O} $
As we have observed in the above reaction there is a transfer of two electrons.
3) The reaction involves the 2 moles ${H_2}{O_2}$. So, to find out the number of electrons used per mole of molecule ${H_2}{O_2}$ we can use the equation for n,
$n = \dfrac{{{\text{number of electrons transferred}}}}{{{\text{number of moles of molecule}}}}$
$n = \dfrac{{2{e^ - }}}{{2{\text{ mol }}{H_2}{O_2}}} = 1$
Therefore, $1{e^ - }$ is used per $1$ mol of ${H_2}{O_2}$
4) Next, we need to find out the molecular weight for ${H_2}{O_2}$,
${\text{Molecular weight of }}{{\text{H}}_2}{{\text{O}}_2} = 2 \times 1 + 2 \times 16 = 34g$
Hence, the calculated molecular weight of the molecule ${H_2}{O_2}$ is $34g$
Now after getting the necessary values and putting it in the equation we can calculate the equivalent weight,
${\text{Equivalent weight = }}\dfrac{{MM}}{n} = \dfrac{{34g}}{1} = 34g$
Hence, option A is marked as the correct choice.
Note:
The equivalent weight of a molecule can also be defined as the amount of that molecule which exactly reacts with another random molecule’s fixed quantity. Whenever the number of electrons transferred and the number of moles of the molecule is the same then the equivalent weight will be the same as the molecular weight of the molecule.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
What organs are located on the left side of your body class 11 biology CBSE
Write an application to the principal requesting five class 10 english CBSE
What is the type of food and mode of feeding of the class 11 biology CBSE
Name 10 Living and Non living things class 9 biology CBSE