Question

Chemistry for Health Sciences 4 - Chemical Formulas and Equations 11. Consider the following balanced equation when answering this problem. [Enrichment] 2 Al + 3 Nicl, 3 Ni + 2 AlCl3 MM: 27.0 129.6 129.6 58.7 133.3 a) If 3.00 mol of Al are used in the reaction, then how many moles of Ni should be produced? b) How many moles of AlCl3 should be produced if 3.00 mol of Al are reacted with the appropriate amount of NiCl2? c) If 4.00 mol of Al are used in the reaction, then how many grams of the Nicl2 are needed in the reaction?

Answer 1

a)

From balanced chemical equation,

Mol of Ni produced = (3/2)*moles of Al reacted

= (3/2)*3.00 mol

= 4.50 mol

Answer: 4.50 mol

b)

From balanced chemical equation,

Mol of AlCl3 produced = (2/2)*moles of Al reacted

= (2/2)*3.00 mol

= 3.00 mol

Answer: 3.00 mol

c)

From balanced chemical equation,

Mol of NiCl2 required = (3/2)*moles of Al reacted

= (3/2)*4.00 mol

= 6.00 mol

Mass of NiCl2 required = Mol of NiCl2 required * molar mass of NiCl2

= 6.00 mol * 129.6 g/mol

= 777.6 g

Answer: 778 g