11th Class Chemistry Some Basic Concepts of Chemistry

  • question_answer 10) Calculate the percentage composition of each element in Sodium sulphate \[N{{a}_{2}}S{{O}_{4}}.\]

    Answer:

    Molecular mass of \[N{{a}_{2}}S{{O}_{4}}=23\times 2+32+16\times 4\] = 46 + 32 + 64 \[=142\text{ }amu\] \[\text{ }\!\!%\!\!\text{ Sodium =}\frac{\text{Mass of Sodium}}{\text{Mass}\,\text{of}\,\text{N}{{\text{a}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}}\times 100\] \[=\frac{46}{142}\times 100=324\] \[\text{ }\!\!%\!\!\text{ Sulphur =}\frac{\text{ }\!\!~\!\!\text{ Mass of Sulphur }\!\!~\!\!\text{ }}{\text{Mass}\,\text{of}\,\text{N}{{\text{a}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\text{ }\!\!~\!\!\text{ }}\text{ }\!\!\times\!\!\text{ 100}\] \[=\frac{32}{142}\times 100=22.59\] % Oxygen \[=100-(32.4+22.5)=45\]  


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