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Chapter 5: Problem 50

The Freons are a class of compounds containing carbon, chlorine, and fluorine. While they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere. In 1991, two replacement compounds for Freons went into production: HFC-134a \(\left(\mathrm{CH}_{2} \mathrm{FCF}_{3}\right)\) and HCFC-124 \(\left(\mathrm{CHClFCF}_{3}\right)\). Calculate the molar masses of these two compounds.

Short Answer

Expert verified
The molar mass of HFC-134a (CH₂FCF₃) is 90.03 g/mol, and the molar mass of HCFC-124 (CHClFCF₃) is 105.47 g/mol.

Step by step solution

01

Identify the molar masses of individual elements

The molar masses of individual elements are as follows (in g/mol): - Carbon (C): 12.01 - Hydrogen (H): 1.01 - Fluorine (F): 19.00 - Chlorine (Cl): 35.45
02

Determine the molar mass of HFC-134a

For HFC-134a (CH₂FCF₃), there is 1 Carbon atom, 2 Hydrogen atoms, and 4 Fluorine atoms. Multiply the respective atoms by their molar masses and sum them up: HFC-134a molar mass = (1 × 12.01) + (2 × 1.01) + (4 × 19.00) = 12.01 + 2.02 + 76.00 = 90.03 g/mol
03

Determine the molar mass of HCFC-124

For HCFC-124 (CHClFCF₃), there is 1 Carbon atom, 1 Hydrogen atom, 1 Chlorine atom, and 3 Fluorine atoms. Multiply the respective atoms by their molar masses and sum them up: HCFC-124 molar mass = (1 × 12.01) + (1 × 1.01) + (1 × 35.45) + (3 × 19.00) = 12.01 + 1.01 + 35.45 + 57.00 = 105.47 g/mol So, the molar mass of HFC-134a is 90.03 g/mol, and the molar mass of HCFC-124 is 105.47 g/mol.

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