Protons and electrons i got it right
<span>The correct answer is (C) 0.2 mole MgCl2.
according to Van't Hoff factor rule which is the ratio between the actual
concentration of the particles produced when the substance dissolved and
the concentration of the substance as measured from its mass, so here 0.2
mole MgCl2 is the higher van't Hoff factor as it has more ions than other
choices and the higher concentration.
and when the boiling point formula is delta Tb = Kb * m * i.
when delta Tb is the change in boiling point.
and Kb is molal boiling point constant
and m is the molality of the solution
and i is Van't Hoff factor.
so we can see the relationship between i and delta Tb, the greater Van't Hoff factor the higher the boiling point. so 0.2 MgCl2 is the higher boiling point as it is the greater van't Hoff factor.</span>
The value of Kb of the unknown amine is 3.22 x 10^-4.
Weak electrolytes:
The compound which do not dissociate completely when added to the aqueous solution are called weak electrolytes. The electrolyte and its ions exists in equilibrium. In case of weak base, the equilibrium constant is expressed as Kb.
Calculations:
Step 1:
The percentage of amine ionized at equilibrium is 2.2%.
NH3 + H2O ------> NH4+ + OH-
The concentration of conjugate acid at equilibrium is calculated as:
2.2 = (x/0.65) x 100
x = 0.0143 M
Step 2:
The equilibrium constant (Kb) is calculated as:
Kb = x^2/0.65 - x
= (0.0143)^2/(0.65 - x)
= 3.22 x 10^-4
Learn more about weak electrolytes here:
brainly.com/question/19340043
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