Answer:
e. 3.08 x 10⁻² mol of ions.
Explanation:
- Every 1.0 mole of any compound contains Avogadro's number of molecules (6.022 x 10²³).
- We can get the no. of moles of NiCl₂ using cross multiplication:
1.0 mol NiCl₂ contains → 6.022 x 10²³ molecules.
??? mol NiCl₂ contains → 6.188 x 10²¹ molecules.
∴ The no. of moles of NiCl₂ = (1.0 mol)(6.188 x 10²¹ molecules)/(6.022 x 10²³ molecules) = 1.028 x 10⁻² mol.
- NiCl₂ is ionized according to the equation:
NiCl₂ → Ni²⁺ + 2Cl⁻.
Which means that every 1.0 mol of NiCl₂ is ionized to produce 3.0 moles (1.0 mol of Ni²⁺ and 2 moles of Cl⁻).
<em>∴ The total moles of ions are released</em> = 3 x 1.028 x 10⁻² mol = <em>3.083 x 10⁻² mol of ions.</em>
Density as you should know is equal to mass/volume. Solve for the volume.
Now, you know that you are dealing with a sphere. You know the volume of a sphere is V= 4/3pi r ^3.
You know the volume so just solve for r
Answer:
D - Silver has lower reactivity than hydrogen and cannot replace it
Explanation:
If we assume , Ag also reacts just like other metals as
Metal + H₂O ---> Metal Hydroxide + H₂
then Ag forms as
Ag + H2O ----->AgOH + 
H2
here Ag is converting into Ag⁺ and 2H⁺ are converting into H₂
for reaction Ag --->Ag⁺ + e⁻ E° = -0.799 V
for reaction H⁺ + e⁻ ---->H₂ E° = 0 V
by Adding those 2 above equations net E° will be -0.799 which is negative.As per Faradays Law
ΔG° = -nFE°
here we got E° as negative then ΔG° will be positive
As per thermodynamics if ΔG° is +ve then reaction is not feasible
so, then given reaction does not occur.....
The question is incomplete, the complete question is;
Why was it necessary to make sure that some solid was present in the main solution before taking the samples to measure Ksp? Select the option that best explains why. Choose... A. To make sure no more sodium borate would dissolve in solution. B. To ensure the dissolution process was at equilibrium. C. To make sure the solution was saturated with sodium and borate ions. D. All of the above
Answer:
B. To ensure the dissolution process was at equilibrium.
Explanation:
The solubility product is a term used in chemistry to describe the equilibrium between the dissolved, dissociated and undissolved solute of a relatively low solubility ionic solid.
For an ionic solid MX, the solubility product is given as ;
MX(s) ----> M^n+(aq) + X^n-(aq)
If Ksp indeed scribes an equilibrium process for dissolution, it then implies that some undissolved solute must be present before samples are taken to measure the Ksp of a sample. This ensures equilibrium between dissolved and undissolved solute.
Answer:
D
Explanation:
If the atom is neutral, the sum of the core and valence electrons is the same as the number of protons, which is the atomic number of the element. So if the sum of the core and valence electrons in a neutral atom equals 25 , that is the number of protons in the atomic nucleus, and the atomic number of the element.
