The concentrations of Fe2+ and o-phen used in an experiment were 0.00136 M and 0.00407 M, respectively. If a student found a stoichimetric volume ratio of 2.0 mL o-phen to 1.0 mL Fe2+, what is the stoichiometric mole ratio of o-phen to Fe2+? Give your answer to two significant figures.

Mole ratio of o-phen to Fe²⁺ is 6.

Explanation:

In the experiment, you are using 0.00136M Fe²⁺ and 0.00407M o-phen solutions. A stoichiometric volume ratio of 2.0mL o-phen to 1.0mL Fe²⁺ means you need to add 2.0mL of o-phen solution for a complete reaction of 1.0mL of Fe²⁺ solutions.

Moles in both solutions are:

Fe²⁺: 1.0x10⁻³L Fe²⁺ × (0.00136mol Fe²⁺ / 1L) = 1.36x10⁻⁶mol Fe²⁺

o-phen:  2.0x10⁻³L o-phen × (0.00407mol o-phen / 1L) = 8.14x10⁻⁶mol o-phen

That means 8.14x10⁻⁶mol o-phen reacts per 1.36x10⁻⁶mol Fe²⁺. The mole ratio is:

8.14x10⁻⁶mol o-phen / 1.36x10⁻⁶mol Fe²⁺ = 6

Mole ratio of o-phen to Fe²⁺ is 6.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.