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Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry1 Mark
MCQ
Cortisone is a molecular substance containing $21$ atoms of carbon per molecule. The mass percentage of carbon in cortisone is $69.98\%.$ It's molar mass is :
  • A
    $176.5$
  • B
    $252.2$
  • C
    $287.6$
  • ✓
    $360.1$
✓

Answer

Correct option: D.
$360.1$
Let molar mass be $= M$
Mass of $21$ carbon atoms $= 252$
$\%$ of carbon $=\frac{252\times100}{\text{M}}=69.98$
but $\%$ of carbon $= 69.98 \%$
$\therefore M = 360.1$

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