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aev [14]
2 years ago
6

250 milliliters of a concentrated iron (II) ion solution are sitting on the lab bench in need of analysis to determine its exact

concentration of Fe2+ ions. As part of the analysis a 15 mL sample of this solution was diluted to a final volume of 100 mL. The iron (II) ion concentration of the diluted solution was found to be 1.35 x 10-3 mg/mL Fe2+. What was the total number of milligrams of iron (II) that were contained in the original solution?
Note that this question is not asking for how many mg/mL of iron (II) where in the original solution, but the total mass of iron contained in the original solution. Hint: You must first calculate the mg/mL of iron (II) in the original solution.
Chemistry
1 answer:
Mars2501 [29]2 years ago
8 0

Answer:

2,25mg of Fe²⁺

Explanation:

A chemical concentration is defined as an amount of solute per amount of solution. The diluted solution has an iron (II) concentration of 1,35x10⁻³ mg/mL. As the dilution was of 15 mL in 100 mL, the concentration of the original solution is:

1,35x10⁻³ mg/mL ×\frac{100mL}{15mL} = <em>9,00x10⁻³ mg/mL</em>

As the total volume of the concentrated iron solution is 250 mL, the total mass of this solution is:

250 mL ×\frac{9,00x10^{-3}mg}{1mL} = <em>2,25 mg of Fe²⁺</em>

<em />

I hope it helps!

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NikAS [45]

Explanation:

The given reaction will be as follows.

            CO + 2H_{2} \leftrightharpoons CH_{3}OH

So, equilibrium constant for this equation will be as follows.

              K_{c} = \frac{[CH_{3}OH]}{[CO][H_{2}]^{2}}

As it is given that concentration of all the species is 2.4. Therefore, calculate the value of equilibrium constant as follows.

               K_{c} = \frac{[CH_{3}OH]}{[CO][H_{2}]^{2}}

                       = \frac{2.4}{2.4 \times (2.4)^{2}}

                       = 0.173

Thus, we can conclude that equilibrium constant for the given reaction is 0.173.  

3 0
3 years ago
An organic solvent has a density of 1.31 g/mL. What volume is occupied by 57.5 g of the liquid?
Burka [1]

Answer:

<h3>The answer is 43.89 mL</h3>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

volume =  \frac{mass}{density} \\

From the question

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density = 1.31 g/mL

We have

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We have the final answer as

<h3>43.89 mL</h3>

Hope this helps you

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For the answer to the question above, use these formulas in solving your problem and as a guide.
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MM = 342 (g/mol) </span>

<span>171 (g) / 342(g/mol) = x mol of sucrose </span>
<span>x moles of sucrose/ 1.25 L =  Molarity of soultion 

</span>I hope I helped you with your problem. Have a beautiful day!
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