Explanation Given molecule is L-carnitine. The molecular formula of L-carnitine is C 7 H 15 NO 3 . One mole of L-carnitine molecule contains seven moles of carbon, fifteen moles of hydrogen, one mole of nitrogen and three moles of oxygen atom. Molar mass of L-carnitine is calculated as follows; Molar mass of L-carnitine = 7 × M(C) + 15 × M(H) + M(N) + 3 × M(O) = ( 7 × 12.01 g ⋅ mol − 1 ) + ( 15 × 1.008 g ⋅ mol − 1 ) + 14.01 g ⋅ mol − 1 + ( 3 × 16.00 g ⋅ mol − 1 ) = 84.07 g ⋅ mol − 1 + 15.12 g ⋅ mol − 1 + 14.01 g ⋅ mol − 1 + 48.00 g ⋅ mol − 1 = 161.2 g ⋅ mol − 1 Mass of carbon, hydrogen, nitrogen and oxygen present in L-carnitine is calculated as shown below; Mass percentage of carbon: Mass percentage of carbon = mass of carbon atoms in L-carnitine mass of L-carnitine molecule × 100 % = 7 mol × 12.01 g ⋅ mol − 1 1 mol × 161.2 g ⋅ mol − 1 × 100 % = 52.15 % Mass percentage of hydrogen: Mass percentage of hydrogen = mass of hydrogen atoms in L-carnitine mass of L-carnitine molecule × 100 % = 15 mol × 1

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Chapter F, Problem F.5E

Interpretation Introduction

Interpretation:

Mass percentage of composition of L-carnitiine has to be calculated.

Concept Introduction:

Mass percentage composition of the individual elements can be calculated if the formula of the compound containing the elements is known. Mass percentage of an element is calculated using the formula given below;

Mass percentage of element=mass of element in sampletotal mass of sample×100%

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Chapter F, Problem F.4E

Chapter F, Problem F.6E

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Chapter F Solutions

CHEMICAL PRINCIPLES PKG W/SAPLING

Ch. F - Prob. A.1AST Ch. F - Prob. A.1BST Ch. F - Prob. A.2AST Ch. F - Prob. A.2BST Ch. F - Prob. A.3AST Ch. F - Prob. A.3BST Ch. F - Prob. A.4AST Ch. F - Prob. A.4BST Ch. F - Prob. A.5AST Ch. F - Prob. A.5BST

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Solution Summary: The author explains that mass percentage of composition of L-carnitiine can be calculated if the formula of the compound containing the elements is known.

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