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.

is there multiple choice answers?

when—without warning—something provokes your anger, you may struggle not to succumb to it. since what typically makes you mad is feeling powerless in the face of what seems unfair, your anger is mostly an attempt at a “quick fix” to right the balance. it’s as though you’re raising a fist in protest, proclaiming that you’re not going to capitulate to such injustice.

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be directed toward a person who has intentionally (and needlessly) behaved in a hurtful way toward you; and

be beneficial or advantageous to you (i.e., assist you in achieving a desired goal).

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explanation: