Chemistry, 04.01.2020 22:31 tony4561

When solid ammonium chloride dissociates at a certain temperature in a 0.500 dm3 container,
ammonia and hydrogen chloride are formed.
nh4cl (s) nh3(g) + hcl (g)
the initial amount of ammonium chloride was 1.00 mol, and when the system had reached
equilibrium there was 0.300 mol of ammonium chloride.
what is the numerical value of kc for this reaction under these conditions?

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Answer from: 3345

1) 0.500 dm3 = 0.5 liter

2) Equilibrium reaction

NH4Cl (s) ⇄ NH3(g) + HCl (g)

3) Table of changes

Number of moles

Species NH4Cl NH3 HCl

Start 1mol 0 0

Change - 0.7 + 0.7 + 0.7

Equilibrium 0.3 0.7 0.7

4) Equilibrium constant

Kc = [NH3] [HCl]

[NH3] = 0.7 mol / 0.5 liter = 1.4 M

[HCl] = 0.7 mol / 0.5 liter = 1.4 M

Kc = (1.4M)^2 = 1.96M^2

The numerical value is just 1.96 (without the units)

Answer from: Quest

yes it is balanced

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.

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When solid ammonium chloride dissociates at a certain temperature in a 0.500 dm3 container,
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