11th Class Chemistry Some Basic Concepts of Chemistry

  • question_answer 74)   Calculate the average atomic mass of hydrogen using the following data :
    Isotope % Natural abundance Molar mass
    \[^{1}H\] 99.985 1
    \[^{2}H\] 0.015 2


      Average atomic mass \[\text{= }\!\!\Sigma\!\!\text{ }\frac{\text{ }\!\!%\!\!\text{ Abundance}}{\text{100}}\text{ }\!\!\times\!\!\text{ Atomic}\,\text{mass}\]  \[=\frac{99.985}{100}\times 1+\frac{0.015}{100}\times 2\] \[=0.99985+0.0003\] \[=1.00015\,amu\]

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