Chemistry, 27.06.2021 22:20 jayzeptor

Calculate the number of moles of NaOH in an aqueous solution of 36 cm3 of 0.1 mol dm−3. PLSS EXPLAIN WHAT YOU DO I DONT GET IT

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Answer from: rachel2005smith

The number of moles of NaOH is 0.0036 moles

Explanation:

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:

$\text{Molarity of solution}=\frac{\text{Moles of solute}\times 1000}{ \text{Volume of solution (mL)}}$ .....(1)

Given values:

Molarity of NaOH = 0.1mol/dm^3=0.1mol/L (Conversion factor: 1L=1dm^3

Volume of the solution = 36cm^3=36 mL (Conversion factor: 1mL=1cm^3

Putting values in equation 1, we get:

$0.1=\frac{\text{Moles of NaOH}\times 1000}{36}\\\\\text{Moles of NaOH}=\frac{0.1\times 36}{1000}=0.0036mol$

Hence, the number of moles of NaOH is 0.0036 moles

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

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid

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Calculate the number of moles of NaOH in an aqueous solution of 36 cm3 of 0.1 mol dm−3. PLSS EXPLAI...

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