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AIIMS 2002
Exam
AIIMS
Year
2002
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

AIIMS 2002 · Chemistry · Some Basic Concepts of Chemistry

The weight of one molecule of a compound C_ 60 H_ 122 is

The weight of one molecule of a compound C60H122\mathrm{C}_{60} \mathrm{H}_{122} is

Options

  1. A1.2×10−20 g1.2 \times 10^{-20} \mathrm{~g}
  2. B5.025×1023 g5.025 \times 10^{23} \mathrm{~g}
  3. C1.4×10−21 g1.4 \times 10^{-21} \mathrm{~g}
  4. D6.023×1023 g6.023 \times 10^{23} \mathrm{~g}.

Correct answer

C. 1.4×10−21 g1.4 \times 10^{-21} \mathrm{~g}

Step-by-step solution

 Molecular weight of C60H122=60×12+1×122=842 g mol−1∴ Weight of 1 mole of C60H122 molecules =842 g⇒ Weight of 6.023×1023 molecules =842 g⇒ Weight of 1 molecule =8426.023×1023=1.4×10−21 g\begin{aligned}& \text{ Molecular weight of } \mathrm{C}_{60} \mathrm{H}_{122}=60 \times12+1 \times122 \\ & =842 \mathrm{~g} \mathrm{~mol}^{-1}\\ & \therefore \text{ Weight of }1 \text{ mole of } \mathrm{C}_{60} \mathrm{H}_{122} \text{ molecules }=842 \mathrm{~g}\\ & \Rightarrow \text{ Weight of }6.023 \times10^{23} \text{ molecules } \quad=842 \mathrm{~g}\\ & \Rightarrow \text{ Weight of }1 \text{ molecule }=\frac{842}{6.023 \times 10^{23}}\\ & =1.4 \times10^{-21} \mathrm{~g}\\ & \end{aligned}
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