In: Chemistry
A 2.95 g sample of an unknown chlorofluorocarbon is decomposed and produces 579 mL of chlorine gas at a pressure of 756 Torr and a temperature of 298 K. Part A What is the percent chlorine (by mass) in the unknown chlorofluorocarbon?
Ans. #Step 1: Calculate the moles of chlorine gas (Cl2) using ideal gas equation –
Now, mass of chlorine gas produced = moles x MW = 0.0235 mol x 70.9054 g mol-1
= 1.667 g
# Step 2: % Cl2 (wt / wt) = (Mass of Cl2 / Mass of sample) x 100
= (1.667 g / 2.95 g) x 100
= 56.51 %