A sample of CH2F2 with a mass of 19 g contains how many atoms of F?

• A. 1.9 × 10^{23} atoms
• B. 9.5 × 10^{22} atoms
• C. 6.0 × 10^{23} atoms
• D. 3.8 × 10^{23} atoms

Answer: (D)

Verified step by step guidance

1. Determine the molar mass of CH\_2F\_2 by adding the atomic masses of its constituent atoms: carbon (C), hydrogen (H), and fluorine (F). Use the atomic masses approximately as C = 12 g/mol, H = 1 g/mol, and F = 19 g/mol.
2. Calculate the number of moles of CH\_2F\_2 in the 19 g sample using the formula: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
3. Find the number of molecules of CH\_2F\_2 by multiplying the moles by Avogadro's number, \$6.022 \times 10^{23}$ molecules/mol.
4. Since each molecule of CH\_2F\_2 contains 2 fluorine atoms, multiply the number of molecules by 2 to get the total number of fluorine atoms.
5. Express the final answer in scientific notation to match the format of the options provided.