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Ch.3 - Molecules and Compounds
All textbooksTro 5th EditionCh.3 - Molecules and CompoundsProblem 64a
Chapter 3, Problem 64a

Determine the number of moles (of molecules or formula units) in each sample. a. 55.98 g CF2Cl2

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Step 1: Identify the molar mass of CF2Cl2.
Step 2: Calculate the molar mass by adding the atomic masses of each element in the compound.
Step 3: Use the formula: number of moles = mass of sample (g) / molar mass (g/mol).
Step 4: Substitute the given mass of CF2Cl2 and the calculated molar mass into the formula.
Step 5: Solve the equation to find the number of moles of CF2Cl2 in the sample.

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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 atoms in a molecule. For CF2Cl2, the molar mass can be determined by adding the atomic masses of carbon (C), fluorine (F), and chlorine (Cl) based on their respective quantities in the formula.
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Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the number of particles (atoms, molecules, or formula units) in one mole of a substance. This constant allows chemists to convert between the number of moles and the number of individual particles, facilitating calculations in stoichiometry and chemical reactions.
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Mole Calculation

To determine the number of moles in a sample, the formula used is: moles = mass (g) / molar mass (g/mol). By applying this formula to the given mass of CF2Cl2, one can find the number of moles present in the sample, which is essential for understanding the quantity of molecules involved in chemical reactions.
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