Question

If 18.40 L of chlorine gas at STP reacts with aluminum metal, how many grams of aluminum chloride are produced?

equation: 3Cl2+2Al-->2AlCl3

Answer 1

At STP 1mol of gas weighs 22.4L

Moles of chlorine

• 18.40/22.4
• 0.8mol

Now

• 3mols of chlorine produces 2 mol AlCl_3
• 1 mol of chlorine produces 0.6mol AlCl_2

Moles of AlCl_3

• 0.8(0.6)
• 0.5mol

Mass of AlCl_3

• 0.5(133)
• 6.5g