Question

According to the balanced equation below, which of the following is equivalent to how many moles of AlCl3 can be made from 4.0 moles of Cl2?

2Al + 3Cl2 ---> 2AlCl3

a) 2.7 moles
b) 4.0 moles
c) 8.0 moles
d) 24 moles

Answer 1

a) 2.7 mol

Step-by-step explanation.:

2Al + 3Cl₂ ⟶ 2AlCl₃

We want to convert moles of Cl₂ to moles of AlCl₃.

Choose the conversion factor ( the correct molar ratio)

It is or either
`\frac{\text{3 mol Cl}_(2)}{\text{2 mol AlCl}_(3)}` or
`\frac{\text{2 mol AlCl}_(3)}{\text{3 mol Cl}_(2)}`

We choose the one with the desired units (mol AlCl₃) on top.

`\text{Moles of AlCl}_(3) = \text{4.0 mol Cl}_(2) * \frac{\text{2 mol AlCl}_(3)}{\text{3 mol Cl}_(2)} = \text{2.7 mol AlCl}_(3)`