Empirical Formula and Molecular Formula
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306630 An organic compound has \(42.1 \%\) carbon, \(6.4 \%\) hydrogen and remainder is oxygen. If its molecular weight is 342 , then its molecular formula is

1 \(\mathrm{C}_{11} \mathrm{H}_{18} \mathrm{O}_{12}\)
2 \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)
3 \(\mathrm{C}_{12} \mathrm{H}_{20} \mathrm{O}_{12}\)
4 \(\mathrm{C}_{14} \mathrm{H}_{20} \mathrm{O}_{10}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306631 An organic compound containing oxygen, carbon, hydrogen and nitrogen contains \({\mathrm{20 \%}}\) carbon, \({\mathrm{6.7 \%}}\) hydrogen and \({\mathrm{46.67 \%}}\) nitrogen. Its molecular mass was found to be \({\mathrm{60 \mathrm{~g} \mathrm{~mol}^{-1}}}\). The total number of atoms in the molecular formula of the compound is ____ .
(At. wt. : \({\mathrm{\mathrm{C}=12 ; \mathrm{H}=1 ; \mathrm{N}=14 ; \mathrm{O}=16}}\) )

1 8
2 5
3 4
4 9
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306632 Which of the following statements about the molecular formula is correct?

1 Molecular formula shows the exact number of different types of atoms present in a molecule.
2 Molecular formula can be obtained from empirical formula if molar mass is known.
3 Percentage composition of a compound can be calculated from its molecular formula.
4 All are correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306633 A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) the empirical formula of the hydrocarbon is

1 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{2}}}\)
2 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{4}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}\)
4 \({{\rm{C}}_{\rm{7}}}{{\rm{H}}_{\rm{8}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306630 An organic compound has \(42.1 \%\) carbon, \(6.4 \%\) hydrogen and remainder is oxygen. If its molecular weight is 342 , then its molecular formula is

1 \(\mathrm{C}_{11} \mathrm{H}_{18} \mathrm{O}_{12}\)
2 \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)
3 \(\mathrm{C}_{12} \mathrm{H}_{20} \mathrm{O}_{12}\)
4 \(\mathrm{C}_{14} \mathrm{H}_{20} \mathrm{O}_{10}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306631 An organic compound containing oxygen, carbon, hydrogen and nitrogen contains \({\mathrm{20 \%}}\) carbon, \({\mathrm{6.7 \%}}\) hydrogen and \({\mathrm{46.67 \%}}\) nitrogen. Its molecular mass was found to be \({\mathrm{60 \mathrm{~g} \mathrm{~mol}^{-1}}}\). The total number of atoms in the molecular formula of the compound is ____ .
(At. wt. : \({\mathrm{\mathrm{C}=12 ; \mathrm{H}=1 ; \mathrm{N}=14 ; \mathrm{O}=16}}\) )

1 8
2 5
3 4
4 9
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306632 Which of the following statements about the molecular formula is correct?

1 Molecular formula shows the exact number of different types of atoms present in a molecule.
2 Molecular formula can be obtained from empirical formula if molar mass is known.
3 Percentage composition of a compound can be calculated from its molecular formula.
4 All are correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306633 A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) the empirical formula of the hydrocarbon is

1 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{2}}}\)
2 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{4}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}\)
4 \({{\rm{C}}_{\rm{7}}}{{\rm{H}}_{\rm{8}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306630 An organic compound has \(42.1 \%\) carbon, \(6.4 \%\) hydrogen and remainder is oxygen. If its molecular weight is 342 , then its molecular formula is

1 \(\mathrm{C}_{11} \mathrm{H}_{18} \mathrm{O}_{12}\)
2 \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)
3 \(\mathrm{C}_{12} \mathrm{H}_{20} \mathrm{O}_{12}\)
4 \(\mathrm{C}_{14} \mathrm{H}_{20} \mathrm{O}_{10}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306631 An organic compound containing oxygen, carbon, hydrogen and nitrogen contains \({\mathrm{20 \%}}\) carbon, \({\mathrm{6.7 \%}}\) hydrogen and \({\mathrm{46.67 \%}}\) nitrogen. Its molecular mass was found to be \({\mathrm{60 \mathrm{~g} \mathrm{~mol}^{-1}}}\). The total number of atoms in the molecular formula of the compound is ____ .
(At. wt. : \({\mathrm{\mathrm{C}=12 ; \mathrm{H}=1 ; \mathrm{N}=14 ; \mathrm{O}=16}}\) )

1 8
2 5
3 4
4 9
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306632 Which of the following statements about the molecular formula is correct?

1 Molecular formula shows the exact number of different types of atoms present in a molecule.
2 Molecular formula can be obtained from empirical formula if molar mass is known.
3 Percentage composition of a compound can be calculated from its molecular formula.
4 All are correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306633 A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) the empirical formula of the hydrocarbon is

1 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{2}}}\)
2 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{4}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}\)
4 \({{\rm{C}}_{\rm{7}}}{{\rm{H}}_{\rm{8}}}\)
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CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306630 An organic compound has \(42.1 \%\) carbon, \(6.4 \%\) hydrogen and remainder is oxygen. If its molecular weight is 342 , then its molecular formula is

1 \(\mathrm{C}_{11} \mathrm{H}_{18} \mathrm{O}_{12}\)
2 \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)
3 \(\mathrm{C}_{12} \mathrm{H}_{20} \mathrm{O}_{12}\)
4 \(\mathrm{C}_{14} \mathrm{H}_{20} \mathrm{O}_{10}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306631 An organic compound containing oxygen, carbon, hydrogen and nitrogen contains \({\mathrm{20 \%}}\) carbon, \({\mathrm{6.7 \%}}\) hydrogen and \({\mathrm{46.67 \%}}\) nitrogen. Its molecular mass was found to be \({\mathrm{60 \mathrm{~g} \mathrm{~mol}^{-1}}}\). The total number of atoms in the molecular formula of the compound is ____ .
(At. wt. : \({\mathrm{\mathrm{C}=12 ; \mathrm{H}=1 ; \mathrm{N}=14 ; \mathrm{O}=16}}\) )

1 8
2 5
3 4
4 9
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306632 Which of the following statements about the molecular formula is correct?

1 Molecular formula shows the exact number of different types of atoms present in a molecule.
2 Molecular formula can be obtained from empirical formula if molar mass is known.
3 Percentage composition of a compound can be calculated from its molecular formula.
4 All are correct.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306633 A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) the empirical formula of the hydrocarbon is

1 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{2}}}\)
2 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{4}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{5}}}\)
4 \({{\rm{C}}_{\rm{7}}}{{\rm{H}}_{\rm{8}}}\)