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

306622 A metal chloride contains \({\mathrm{\mathrm{55.0 \%}}}\) of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0.57 g . The molecular formula of the metal chloride is
(Given : Atomic mass of chlorine is 35.5 u )

1 \({\mathrm{\mathrm{\mathrm{MCl}_{4}}}}\)
2 \({\mathrm{\mathrm{\mathrm{MCl}_{3}}}}\)
3 \({\mathrm{\mathrm{\mathrm{MCl}_{2}}}}\)
4 MCl
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306623 The ratio of mass percent of C and H of an original compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) is 6 : 1. If one molecule of the above compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) contains half as much oxygen as required to burn one molecule of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}\) completely to \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) and \({{\rm{H}}_{\rm{2}}}{\rm{O}}\). The empirical formula of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}\) is :

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

306634 Empirical formula of a compound is \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) and its molecular mass is 90, the molecular formula of the compound is

1 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{6}}}{{\rm{O}}_{\rm{3}}}\)
2 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{4}}}{{\rm{O}}_{\rm{2}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{{\rm{12}}}}{{\rm{O}}_{\rm{6}}}\)
4 \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306624 The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is

1 \({\rm{XY}}\)
2 \({{\rm{X}}_{\rm{2}}}{\rm{Y}}\)
3 \({\rm{X}}{{\rm{Y}}_{\rm{3}}}\)
4 \({{\rm{X}}_{\rm{2}}}{{\rm{Y}}_{\rm{3}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306622 A metal chloride contains \({\mathrm{\mathrm{55.0 \%}}}\) of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0.57 g . The molecular formula of the metal chloride is
(Given : Atomic mass of chlorine is 35.5 u )

1 \({\mathrm{\mathrm{\mathrm{MCl}_{4}}}}\)
2 \({\mathrm{\mathrm{\mathrm{MCl}_{3}}}}\)
3 \({\mathrm{\mathrm{\mathrm{MCl}_{2}}}}\)
4 MCl
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306623 The ratio of mass percent of C and H of an original compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) is 6 : 1. If one molecule of the above compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) contains half as much oxygen as required to burn one molecule of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}\) completely to \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) and \({{\rm{H}}_{\rm{2}}}{\rm{O}}\). The empirical formula of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}\) is :

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

306634 Empirical formula of a compound is \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) and its molecular mass is 90, the molecular formula of the compound is

1 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{6}}}{{\rm{O}}_{\rm{3}}}\)
2 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{4}}}{{\rm{O}}_{\rm{2}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{{\rm{12}}}}{{\rm{O}}_{\rm{6}}}\)
4 \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306624 The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is

1 \({\rm{XY}}\)
2 \({{\rm{X}}_{\rm{2}}}{\rm{Y}}\)
3 \({\rm{X}}{{\rm{Y}}_{\rm{3}}}\)
4 \({{\rm{X}}_{\rm{2}}}{{\rm{Y}}_{\rm{3}}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306622 A metal chloride contains \({\mathrm{\mathrm{55.0 \%}}}\) of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0.57 g . The molecular formula of the metal chloride is
(Given : Atomic mass of chlorine is 35.5 u )

1 \({\mathrm{\mathrm{\mathrm{MCl}_{4}}}}\)
2 \({\mathrm{\mathrm{\mathrm{MCl}_{3}}}}\)
3 \({\mathrm{\mathrm{\mathrm{MCl}_{2}}}}\)
4 MCl
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306623 The ratio of mass percent of C and H of an original compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) is 6 : 1. If one molecule of the above compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) contains half as much oxygen as required to burn one molecule of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}\) completely to \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) and \({{\rm{H}}_{\rm{2}}}{\rm{O}}\). The empirical formula of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}\) is :

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

306634 Empirical formula of a compound is \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) and its molecular mass is 90, the molecular formula of the compound is

1 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{6}}}{{\rm{O}}_{\rm{3}}}\)
2 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{4}}}{{\rm{O}}_{\rm{2}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{{\rm{12}}}}{{\rm{O}}_{\rm{6}}}\)
4 \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306624 The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is

1 \({\rm{XY}}\)
2 \({{\rm{X}}_{\rm{2}}}{\rm{Y}}\)
3 \({\rm{X}}{{\rm{Y}}_{\rm{3}}}\)
4 \({{\rm{X}}_{\rm{2}}}{{\rm{Y}}_{\rm{3}}}\)
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CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306622 A metal chloride contains \({\mathrm{\mathrm{55.0 \%}}}\) of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0.57 g . The molecular formula of the metal chloride is
(Given : Atomic mass of chlorine is 35.5 u )

1 \({\mathrm{\mathrm{\mathrm{MCl}_{4}}}}\)
2 \({\mathrm{\mathrm{\mathrm{MCl}_{3}}}}\)
3 \({\mathrm{\mathrm{\mathrm{MCl}_{2}}}}\)
4 MCl
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306623 The ratio of mass percent of C and H of an original compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) is 6 : 1. If one molecule of the above compound \({\rm{(}}{{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}{\rm{)}}\) contains half as much oxygen as required to burn one molecule of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}\) completely to \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) and \({{\rm{H}}_{\rm{2}}}{\rm{O}}\). The empirical formula of compound \({{\rm{C}}_{\rm{x}}}{{\rm{H}}_{\rm{y}}}{{\rm{O}}_{\rm{z}}}\) is :

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

306634 Empirical formula of a compound is \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\) and its molecular mass is 90, the molecular formula of the compound is

1 \({{\rm{C}}_{\rm{3}}}{{\rm{H}}_{\rm{6}}}{{\rm{O}}_{\rm{3}}}\)
2 \({{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{4}}}{{\rm{O}}_{\rm{2}}}\)
3 \({{\rm{C}}_{\rm{6}}}{{\rm{H}}_{{\rm{12}}}}{{\rm{O}}_{\rm{6}}}\)
4 \({\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

306624 The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is

1 \({\rm{XY}}\)
2 \({{\rm{X}}_{\rm{2}}}{\rm{Y}}\)
3 \({\rm{X}}{{\rm{Y}}_{\rm{3}}}\)
4 \({{\rm{X}}_{\rm{2}}}{{\rm{Y}}_{\rm{3}}}\)