Textbook Question
Calculate the following quantities: (c) number of molecules in 8.447⨉10−2 mol C6H6
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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Chapter 3, Problem 37b
(b) How many moles of chloride ions are in 0.2550 g of aluminum chloride?
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a molecule. For aluminum chloride (AlCl3), the molar mass is approximately 133.33 g/mol, which is essential for converting grams of the compound to moles.
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Molar Mass Concept
Stoichiometry
Stoichiometry is the area of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. In the case of aluminum chloride, each formula unit contains three chloride ions (Cl-). Understanding stoichiometry allows us to determine how many moles of chloride ions are present based on the moles of aluminum chloride.
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Conversion of Grams to Moles
To find the number of moles from a given mass, the formula used is: moles = mass (g) / molar mass (g/mol). This conversion is crucial for solving the problem, as it allows us to calculate the moles of aluminum chloride first, which can then be used to find the moles of chloride ions through stoichiometric relationships.
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Related Practice
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Calculate the following quantities: (d) number of O atoms in 6.25⨉10−3 mol Al(NO3)3
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(a) What is the mass, in grams, of 2.50⨉10−3 mol of ammonium phosphate?
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(c) What is the mass, in grams, of 7.70⨉1020 molecules of caffeine, C8H10N4O2?
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(d) What is the molar mass of cholesterol if 0.00105 mol has a mass of 0.406 g?
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(a) What is the mass, in grams, of 1.223 mol of iron(III) sulfate? (b) How many moles of ammonium ions are in 6.955 g of ammonium carbonate? (c) What is the mass, in grams, of 1.50 * 1021 molecules of aspirin, C9H8O4?
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