
Calculate the total number of electrons present in of water.
A.
B.
C.
D.
Answer
493.5k+ views
Hint: Firstly, with our knowledge of the molar mass of water, we can find the number of moles of the mass of water given to us. Then we can calculate the number of electrons in one molecule of water, by counting the individual electrons of the hydrogen and oxygen atoms. Multiplying the number of moles with the avogadro number and the number of electrons in a single molecule will give us our answer.
Formulas used: where is the number of moles, is the given mass and is the molar mass
Complete step by step answer:
First, we have to find out the number of electrons present in a single molecule of water.
For that we have to know that a single molecule of water contains two hydrogen atoms and a single oxygen atom. The hydrogen atoms each contain a single electron and the oxygen atom has eight electrons. So, in total a single molecule of water contains electrons in it.
Now the molecular weight of water is calculated by adding the molecular weights of two hydrogen and an oxygen atom and the answer is .
Next, we find out how many moles are present in of water,
where is the number of moles, is the given mass and is the molar mass
Substituting values as and , we get:
where is the number of moles present in of water.
Therefore are present in of water.
One molecule of water contains molecules.
Now multiplying the with the Avogadro’s number and then by the number of electrons in a single molecule of water , we get
Therefore, there are of electrons present in of water.
The correct option is option A.
Note:The number of electrons and number of molecules should not be confused with each other. The number of electrons in a single water molecule is while the number of moles in one mole water is . Note that the molar mass of water is the mass of water which will have its number of water molecules equal to the Avogadro’s number. In other words, in of water, there will be exactly molecules of water.
Formulas used:
Complete step by step answer:
First, we have to find out the number of electrons present in a single molecule of water.
For that we have to know that a single molecule of water contains two hydrogen atoms and a single oxygen atom. The hydrogen atoms each contain a single electron and the oxygen atom has eight electrons. So, in total a single molecule of water contains
Now the molecular weight of water is calculated by adding the molecular weights of two hydrogen and an oxygen atom and the answer is
Next, we find out how many moles are present in
Substituting values as
Therefore
One molecule of water contains
Now multiplying the
Therefore, there are
The correct option is option A.
Note:The number of electrons and number of molecules should not be confused with each other. The number of electrons in a single water molecule is
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