7,(0) Compound X has the following percentage composition by mass: C: 38.9% ; H: 5.4% ; Cl: 38.4%; 0: 17.3% 6) Calculate the empirical formula of X. (Relative atomic mass of C- 12: H- 1: CI - 35.5: 0- 16.0) CI % by mass of atoms relative no, of mole of atoms (-% by mass + relative atomie mass) simplest mole ratio of atoms (divided by the smallest no, of mole) The empirical formula of X is (ii) Find out the molecular formula of X if the relative molecular mass of X is 92.5. (e) If X is an optically alkanal, give the structural formula of X and draw this pair of enantiomers. Structural formula of X:

7,(0) Compound X has the following percentage composition by mass: C: 38.9% ; H: 5.4% ; Cl: 38.4%; 0: 17.3% 6) Calculate the empirical formula of X. (Relative atomic mass of C- 12: H- 1: CI - 35.5: 0- 16.0) CI % by mass of atoms relative no, of mole of atoms (-% by mass + relative atomie mass) simplest mole ratio of atoms (divided by the smallest no, of mole) The empirical formula of X is (ii) Find out the molecular formula of X if the relative molecular mass of X is 92.5. (e) If X is an optically alkanal, give the structural formula of X and draw this pair of enantiomers. Structural formula of X:

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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Chapter1: Chemical Foundations

Section: Chapter Questions

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

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7.(a) Compound X has the following percentage composition by mass:
C: 38.9% ; H: 5.4% ; Cl: 38.4%; O: 17.3%
(i) Calculate the empirical formula of X.
(Relative atomic mass of C = 12; H = 1; Cl= 35.5; O= 16.0)
C
H
Cl
% by mass of atoms
relative no. of mole of atoms
(= % by mass ÷ relative atomic mass)
simplest mole ratio of atoms
(divided by the smallest no. of mole)
The empirical formula of X is
(ii)
Find out the molecular formula of X if the relative molecular mass of X is 92.5.
(c) If X is an optically alkanal, give the structural formula
X and draw this pair of enantiomers.
Structural formula of X :
(b) If X has a C=C bond and a saturated OH group (i.e. The OH group does not attach to the C=C), give the
structural formula of X if X shows cis-trans isomerism. Draw the pair of cis-trans isomers.
Structural formula of X :

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