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Ch.3 - Molecules and Compounds
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 5th EditionCh.3 - Molecules and CompoundsProblema 68b
Capitolo 3, Problema 68b

Calculate the mass (in g) of each sample. b. 9.85×1019 CCl2F2 molecules c. 1 water molecule

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Determine the molar mass of CCl2F2 by adding the atomic masses of carbon (C), chlorine (Cl), and fluorine (F). The atomic masses are approximately: C = 12.01 g/mol, Cl = 35.45 g/mol, and F = 19.00 g/mol. Since there are two chlorine and two fluorine atoms, the molar mass of CCl2F2 is calculated as: Molar mass = 12.01 g/mol + (2 \(\times\) 35.45 g/mol) + (2 \(\times\) 19.00 g/mol).
Convert the number of CCl2F2 molecules to moles using Avogadro's number, which is approximately 6.022 \(\times\) 10^{23} molecules/mol. Use the formula: Moles = Number of molecules / Avogadro's number.
Calculate the mass of the CCl2F2 sample by multiplying the number of moles by the molar mass of CCl2F2. Use the formula: Mass (g) = Moles \(\times\) Molar mass (g/mol).
Ensure the units are consistent throughout the calculation to avoid any errors in the final result.
Double-check each calculation step for accuracy to ensure the correct mass is determined.

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Molecular Weight

Molecular weight is the mass of a molecule calculated as the sum of the atomic weights of all atoms in the molecule. For CCl2F2, the molecular weight can be determined by adding the atomic weights of carbon (C), chlorine (Cl), and fluorine (F) based on their respective quantities in the formula. This value is essential for converting between moles and grams.
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Weight Conversion Example

Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the number of particles (atoms, molecules, etc.) in one mole of a substance. This constant allows chemists to relate the number of molecules to the amount of substance in moles, which is crucial for calculations involving mass and molecular quantities.
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Avogadro's Law

Conversion from Molecules to Grams

To calculate the mass of a sample from the number of molecules, one must first convert the number of molecules to moles using Avogadro's number. Then, the number of moles is multiplied by the molecular weight of the substance to find the mass in grams. This process is fundamental in stoichiometry and quantitative chemistry.
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Percorso guidato
03:45
Weight Conversion Example
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