The vapour density of the methyl ester of an | vedclass

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(B) The molecular mass of the methyl ester is calculated as: $M_{	ext{ester}} = 2 	imes 	ext{Vapour Density} = 2 	imes 37 = 74 \ g/mol$. Let the m

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$60$

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(B) The molecular mass of the methyl ester is calculated as: $M_{	ext{ester}} = 2 	imes 	ext{Vapour Density} = 2 	imes 37 = 74 \ g/mol$. Let the monocarboxylic acid be $RCOOH$. The methyl ester is $RCOOCH_3$. The molecular mass of the ester is $M_R + 44 + 15 = 74$,where $M_R$ is the mass of the alkyl group $R$. $M_R + 59 = 74 \implies M_R = 15$. An alkyl group with mass $15$ is the methyl group $(-CH_3)$. Thus,the acid is $CH_3COOH$ (acetic acid). The molecular weight of the acid $CH_3COOH$ is $12 + 3 + 12 + 16 + 16 + 1 = 60 \ g/mol$.

Element	Atomic mass
$A$	$12.01$
$B$	$35.5$

The vapour density of the methyl ester of an organic monocarboxylic acid is $37$. What is the molecular weight of the acid?

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