Question

$I$. Experimental data shown a compound contains $25$% carbon, $2$% hydrogen and $73$% chlorine and has a molar mass of $96.9g/mol$. This compound has a molecular formula of $C_2{H}_2{Cl}_2$.
$II$. A $100g$ sample of this compound would contain about $25g$ of carbon ($2mol$), $2g$ of hydrogen ($2mol$), and $73g$ chlorine ($2mol$).

• A. Statement $I$ is true, Statement $II$ is true and is a correct explanation of the phenomena described in $I$
• B. Statement $I$ is true, Statement $II$ is false
• C. Statement $I$ is false, Statement $II$ is true
• D. Statement $I$ is false, Statement $II$ is false

Answer 1

Answer: (A)

Statement $I$ is true, Statement $II$ is true and is a correct explanation of the phenomena described in $I$

Given, Molar mass of compound $=96g$

$\%C=25;\%H=2;\%Cl=73\%$

In $1mole,$ mass of carbon present $=\frac{25}{100}\times 96=24g$

$\Rightarrow 2moles$ of carbon is present.

Mass of hydrogen present $=\frac{2}{100}\times 96=2g$

$\Rightarrow 2moles$ of hydrogen is present.

Mass of chlorine present $=\frac{73}{100}\times 96=71g$

$\Rightarrow 2moles$ of chlorine is present.

$\Rightarrow$ Molecular formula is $C_2{H}_{2}C{l}_2$