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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
Mass percentage of $C, H$ and $O$ in a compound are $60\%$, $13.33\%$ and $26.67\%$ respectively. Molecular weight of the compound is $60$. The molecular formula of the compound is 
  • A
    $CH_3OH$
  • B
    $C_2H_6O_2$
  • C
    $C_2H_6O$
  • ✓
    $C_3H_8O$
✓

Answer

Correct option: D.
$C_3H_8O$
d
$\begin{array}{*{20}{l}}
  {{\text{ Empirical formula }} \Rightarrow }&{{C_{\frac{{60}}{{12}}}}{H_{\frac{{13.33}}{1}}}{O_{\frac{{26.67}}{{16}}}}} \\ 
  { \Rightarrow {{\text{C}}_5}{{\text{H}}_{13.33}}{{\text{O}}_{1.67}}}&{{\text{EF}} = {{\text{C}}_3}{{\text{H}}_8}{\text{O}}} \\ 
  {{\text{n}} = \frac{{60}}{{60}} = 1}&{{\text{MF}} = {{\text{C}}_3}{{\text{H}}_8}{\text{O}}} 
\end{array}$

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