(D) The combustion reaction is: $C_xH_y + (x + y/4) O_2 \to x CO_2 + (y/2) H_2O$Moles of $H_2O = 0.72 / 18 = 0.04 \ mol$Moles of $CO_2 = 3.08 / 44 = 0

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(D) The combustion reaction is: $C_xH_y + (x + y/4) O_2 \to x CO_2 + (y/2) H_2O$Moles of $H_2O = 0.72 / 18 = 0.04 \ mol$Moles of $CO_2 = 3.08 / 44 = 0.07 \ mol$From the stoichiometry:Moles of $C = \text{moles of } CO_2 = 0.07 \ mol$Moles of $H = 2 \times \text{moles of } H_2O = 2 \times 0.04 = 0.08 \ mol$The ratio of $C:H = 0.07 : 0.08 = 7:8$Therefore,the empirical formula is $C_7H_8$.

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

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?

A
$C_2H_4$
B
$C_3H_4$
C
$C_6H_5$
D
$C_7H_8$

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Some Basic Concepts of Chemistry

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Percentage composition and Molecular formula

Determine the empirical formula of an oxide of iron which has $69.9 \%$ iron and $30.1 \%$ dioxygen by mass.

Medium

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Two elements,$X$ and $Y$,have atomic numbers $33$ and $17$,respectively. The molecular formula of a stable compound formed between them is

MediumKVPY 2014

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If two compounds have the same empirical formula but different molecular formulas,which of the following do they possess?

Easy

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The empirical formula of a compound is $CH_2O$. If its molecular weight is $180$,what is the molecular formula of the compound?

MediumAIIMS 1999

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In a compound,$C$,$H$,and $N$ atoms are present in $9 : 1 : 3.5$ by weight. The molecular weight of the compound is $108$. What is the molecular formula of the compound?

MediumAIEEE 2002

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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?

Similar Questions

Determine the empirical formula of an oxide of iron which has $69.9 \%$ iron and $30.1 \%$ dioxygen by mass.

Two elements,$X$ and $Y$,have atomic numbers $33$ and $17$,respectively. The molecular formula of a stable compound formed between them is

If two compounds have the same empirical formula but different molecular formulas,which of the following do they possess?

The empirical formula of a compound is $CH_2O$. If its molecular weight is $180$,what is the molecular formula of the compound?

In a compound,$C$,$H$,and $N$ atoms are present in $9 : 1 : 3.5$ by weight. The molecular weight of the compound is $108$. What is the molecular formula of the compound?

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