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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Malic acid, an organic acid found in apples, contains C, H, and O in the following ratios: C1H1.50O1.25 What is the empirical formula of malic acid?

Interpretation Introduction

Interpretation: The empirical formula of malic acid should be determined.

Concept introduction:

  • Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
  • Molecular Formula: It is the simplest representation of composition of chemical substance where each and every type of atom is written with the total number of the atom present in the substance.
  • Equation for finding Molecular formula from the empirical formula,

    MolarmassEmpiricalformula mass × Empirical formula

  • Equation for number moles from mass and molar mass,

  Numberofmoles=MassingramsMolarmass

Explanation

Given mole ratios between the elements (C,H,andO ) in malic acid is

    C:H:O=1:1.50:1.25

Dividing the every element’s number of moles by the smallest number of mole.

    C:H:O=11:1.501:1.251

To get the whole number ration between these elements multiplying the above mentioned ratio by 4

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