11th Class Chemistry Some Basic Concepts of Chemistry

  • question_answer 71)   Calculate the mass per cent of calcium, phosphorus and oxygen in calcium phosphate \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}.\]


      Molecule = \[C{{a}_{3}}{{\left( P{{O}_{4}} \right)}_{2}}\] Mass of =\[Ca=3\times 40=120amu\] Mass of Phosphorous = \[2\times 31=62amu\] Mass of Oxygen = \[8\times 16=128amu\] \[\therefore \]Molar mass of \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}=120+62+128=310amu\] Mass % of Calcium = \[\frac{120}{310}\times 100=38.7%\] Mass % of Phosphorous = \[\frac{62}{310}\times 100=20%\] Mass % of Oxygen = \[\frac{128}{310}\times 100=41.3%\]

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