Explanation Given The molar mass of vitamin A is 286.4 g / mol . The mass percent of carbon is 83.86 % . The mass percent of hydrogen is 10.56 % . The mass of the given vitamin A is 286.4 g / mol . Therefore, the mass of carbon = 83.86 % of 286.4 g = ( 83.86 100 × 286.4 ) g ≈ 240 g The mass of hydrogen = 10.56 % of 286.4 g = ( 10.56 100 × 286.4 ) g ≈ 30 g The mass of element E = ( 286.4 − ( Mass of carbon + Mass of hydrogen ) ) g = ( 286.4 − 240 − 30 ) g ≈ 16 g The calculated mass of the element E corresponds to 1 mol of oxygen ( O ) . The atomic mass of carbon is 12 g / mol . The atomic mass of hydrogen is 1 g / mol . The atomic mass of oxygen is 16 g / mol

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ISBN: 9780100552234

Author: ZUMDAHL

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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 b…

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Chapter 5, Problem 149AE

Interpretation Introduction

Interpretation: The molar mass and the general molecular of vitamin A is given as CxHyE , where E is an unknown element. The molecular formula of the given vitamin A is to be stated.

Concept introduction: The number of moles of a substance is calculated by the formula,

Number of moles=Given mass of the substanceAtomic mass of the substance

To determine: The molecular formula of the given vitamin A.

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Chapter 5, Problem 148AE

Chapter 5, Problem 150AE

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