Question

how many grams of cl are in a 38.0-g sample of the chlorofluorocarbon cf₃cl? express your answer in grams for chlorine to three significant figures.

Explanation:

Step1: Calculate molar mass of CF₃Cl

Molar mass = C + 3F + Cl = 12.01 + 3×19.00 + 35.45 = 104.46 g/mol

Step2: Find mass fraction of Cl

Mass fraction = $\frac{35.45}{104.46}$ ≈ 0.3394

Step3: Calculate Cl mass in sample

Cl mass = 38.0 g × 0.3394 ≈ 13.097 g ≈ 13.1 g

Answer:

13.1