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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.3 - Chemical Reactions and Reaction StoichiometryProblema 39b
Capitolo 3, Problema 39b

The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2. (b) How many moles of allicin are present in 5.00 mg of this substance?

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First, calculate the molar mass of allicin (C6H10OS2). To do this, sum the atomic masses of all the atoms in the formula: 6 carbons (C), 10 hydrogens (H), 1 oxygen (O), and 2 sulfurs (S).
Convert the mass of allicin from milligrams to grams, as molar mass is typically expressed in grams per mole.
Use the formula for number of moles, which is given by moles = mass (g) / molar mass (g/mol).
Substitute the mass of allicin in grams and its molar mass into the formula to calculate the number of moles.
Ensure the final answer has the correct units of moles and consider significant figures based on the given data.

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Molecular Formula

A molecular formula indicates the number and type of atoms in a molecule. For allicin, C6H10OS2, it shows there are 6 carbon atoms, 10 hydrogen atoms, 1 oxygen atom, and 2 sulfur atoms. Understanding the molecular formula is essential for calculating the molar mass, which is necessary for converting mass to moles.
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02:08
Determining Molecular Formulas

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). To find the number of moles in a given mass, you first calculate the molar mass of allicin by summing the atomic masses of all atoms in its molecular formula. This value is crucial for converting the mass of allicin (5.00 mg) into moles.
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Molar Mass Concept

Conversion from Mass to Moles

To convert mass to moles, the formula used is: moles = mass (g) / molar mass (g/mol). In this case, the mass of allicin must be converted from milligrams to grams (5.00 mg = 0.005 g) before applying the formula. This conversion is fundamental for determining how many moles of allicin are present in the specified mass.
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Mass and Moles Conversion
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