Chemistry, 06.03.2020 23:35 kleighlamb4850

3.00 mL of 0.00200 M Fe3+ is mixed with 4.00 mL of 0.00200 M SCN– and 3.00 mL of H2O? What is the initial concentration of Fe3+ after mixing, but before any reaction takes place?

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Answer from: babygail0818

Answer : The concentration of $Fe^{3+}$ after mixing is, $6.0\times 10^{-4}M$

Explanation :

First we have to calculate the moles of $Fe^{3+}$ before mixing.

$\text{Moles of }Fe^{3+}=\text{Concentration of }Fe^{3+}\times \text{Volume of }Fe^{3+}$

$\text{Moles of }Fe^{3+}=0.00200M\times 0.003L=6.0\times 10^{-6}mol$

Now we have to calculate the total volume of solution after mixing.

Volume of solution = (3.00 + 4.00 + 3.00) mL

Volume of solution = 10.00 mL = 0.010 L

Now we have to calculate the concentration of $Fe^{3+}$ after mixing.

$\text{Concentration of }Fe^{3+}=\frac{\text{Moles of }Fe^{3+}}{\text{Volume of solution}}$

$\text{Concentration of }Fe^{3+}=\frac{6.0\times 10^{-6}mol}{0.010L}=6.0\times 10^{-4}M$

Thus, the concentration of $Fe^{3+}$ after mixing is, $6.0\times 10^{-4}M$

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

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3.00 mL of 0.00200 M Fe3+ is mixed with 4.00 mL of 0.00200 M SCN– and 3.00 mL of H2O? What is the in...

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