(C) Let the mass of each substance be $W$. The number of moles of $X$ is $n_X = \frac{W}{30}$. The number of moles of $Y$ is $n_Y = \frac{W}{20}$. The

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(C) Let the mass of each substance be $W$. The number of moles of $X$ is $n_X = \frac{W}{30}$. The number of moles of $Y$ is $n_Y = \frac{W}{20}$. The ratio of moles $n_X : n_Y = \frac{W}{30} : \frac{W}{20} = \frac{1}{3} : \frac{1}{2} = 2 : 3$. Thus,the empirical formula is $X_2Y_3$. The empirical formula weight is $(2 \times 30) + (3 \times 20) = 60 + 60 = 120$. Since the given molecular weight is $120$,the molecular formula is the same as the empirical formula,which is $X_2Y_3$.

Class 11 Chemistry Some Basic Concepts of Chemistry Percentage composition and Molecular formula

Easy

Substances $X$ and $Y$ have the same mass. If their atomic weights are $30$ and $20$ respectively,and the molecular weight of the compound is $120$,what is the molecular formula of the compound?

A
$X_2Y_2$
B
$X_3Y_3$
C
$X_2Y_3$
D
$X_3Y_2$

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Some Basic Concepts of Chemistry

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Percentage composition and Molecular formula

$0.30 \ g$ of an organic compound containing $C$,$H$ and $O$ on combustion yields $0.44 \ g \ CO_2$ and $0.18 \ g \ H_2O$. If $1 \ mol$ of the compound weighs $60 \ g$,then the molecular formula of the compound is:

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If the percentage of $Se$ (atomic weight $78.4$) in a peroxidase anhydrous enzyme is $0.5\%$,what is the minimum molecular weight of the peroxidase anhydrous enzyme?

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$0.5 \ g$ of an organic compound $(X)$ with $60 \%$ carbon will produce $........ \times 10^{-1} \ g$ of $CO_2$ on complete combustion.

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Complete combustion of a hydrocarbon yields $0.72 \ g$ of water and $3.08 \ g$ of $CO_2$. What is the empirical formula of the hydrocarbon?

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Substances $X$ and $Y$ have the same mass. If their atomic weights are $30$ and $20$ respectively,and the molecular weight of the compound is $120$,what is the molecular formula of the compound?

Similar Questions

$0.30 \ g$ of an organic compound containing $C$,$H$ and $O$ on combustion yields $0.44 \ g \ CO_2$ and $0.18 \ g \ H_2O$. If $1 \ mol$ of the compound weighs $60 \ g$,then the molecular formula of the compound is:

If the percentage of $Se$ (atomic weight $78.4$) in a peroxidase anhydrous enzyme is $0.5\%$,what is the minimum molecular weight of the peroxidase anhydrous enzyme?

Haemoglobin contains $0.33 \%$ of iron by mass. The molecular mass of haemoglobin is $67200$. The number of iron atoms present in one molecule of haemoglobin is: (Atomic mass of $Fe = 56$)

$0.5 \ g$ of an organic compound $(X)$ with $60 \%$ carbon will produce $........ \times 10^{-1} \ g$ of $CO_2$ on complete combustion.

Complete combustion of a hydrocarbon yields $0.72 \ g$ of water and $3.08 \ g$ of $CO_2$. What is the empirical formula of the hydrocarbon?

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