Question:

The percentage of oxygen in $NaOH$ is

Updated On: Aug 1, 2023
  • 0.16
  • 0.04
  • 0.4
  • 0.08
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The Correct Option is C

Approach Solution - 1

Molecular weight of $NaOH$ is $40$ Atomic weight of oxygen is $16$ $\Rightarrow \,\,\,\,\,$ Percentage of oxygen $=\frac{16}{40} \times 100 $ $=40 \%$
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Approach Solution -2

Ans: For the percentage of oxygen in NaOH, we can calculate the mass fraction of oxygen in the compound. 

The chemical formula of sodium hydroxide is NaOH. It means the atoms that are present in this compound are 1 sodium, 1 oxygen and 1 hydrogen. 


 

The molar mass of all these atoms present in the compounds are as follows:

Molar mass of Na= 22.99 g/mol

Molar mass of O= 16 g/mol 

Molar mass of H= 1 g/mol 

Therefore, the molar mass of the compound will be NaOH= 22.99+16+1 = 40 g/mol 

The mass fraction of oxygen = mass of oxygen /molar mass of NaOH x100

= 16/40 X100 

That is approximately 40% 

Therefore, the answer is 40% 


 

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