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A mixture of 1.0 mole of Al and 3.0 mole...

A mixture of 1.0 mole of Al and 3.0 mole of `Cl_(2)` are allowed to react as:
`2Al(s)+3Cl_(2)(g) to 2AlCl_(3)(g)`. Then moles of excess reagent left unreacted is:

A

3.5

B

1

C

1.5

D

2.5

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