Step-by-step explanation:
The question gives us:
C2H2 + 2Cl2 → C2H2Cl4
First, let's transform 75 grams of C2H2Cl4 into moles. We need to use the following formula:
n = m/MM
MM of C2H2Cl4 = 167.848 g/mol
n = 75/167.848
n = 0.4468 moles
The ratio between Cl2 and C2H2Cl4 is 2:1.
2 moles of Cl2 ---- 1 mole of C2H2Cl4
x moles of Cl2 ---- 0.4468 moles of C2H2Cl4
x = 0.89 moles
Now let's transform 0.89 moles of Cl2 into grams:
m = n*MM
MM of Cl2 = 70.9 g/mol
m = 0.89*70.9 = 63.4 g
Answer: 63.4 g