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Answer:
<em>The amount of Cl2 gas left , after the reaction goes to completion is : </em><u><em>139.655 grams</em></u>
Explanation:
Molar mass : It is the mass in grams present in one mole of the substance.
Moles of the substance is calculated by:
According to this equation:
2 mole of Al = 3 mole of Cl2 = 2 mole of AlCl3
Molar mass of Al = 27.0 g/mol
Mass of Al = 20.1 gram
Moles of Al present in the reaction :
Moles of Al = 0.744
Similarly calculate the moles of Cl2
Molar mass of Cl2 = 71.0 g/mol
Mass = 219 gram
Moles of Cl2 = 3.08 moles
According to equation,
2 mole of Al reacts with = 3 mole of Cl2
1 moles of Al reacts with = 3/2 mole of Cl2
0.744 moles of Al reacts with = 3/2(0.744) moles of Cl2
= 1.116 moles of Cl2
But actually present Cl2 = 3.08 moles
Hence Al is the limiting reagent , and Cl2 is the excess reagent.
The whole Aluminium Al get consumed during the reaction.
The amount of Cl2 in excess = Total Cl2 - Cl2 consumed
Cl2 in excess = 3.08 - 1.116 = 1.964 moles
<u>Cl2 in grams</u><u> </u>= 1.964 x 70.90 <u>= 139.655 grams</u>