Hi!
B. Granite is an example of a heterogenous mixture.
Explanation:
It is known that molality is the number of moles present in kg of solution.
Mathematically, Molality =
The given data is as follows.
Molar mass of ammonia = 17 g/mol
Concentration = 1.002 mg/L =
=
mol/L
Also, density =
= 1 kg/L
Therefore, molality will be calculated as follows.
Molality = 
=
And,
Molar mass of nitrite = 46 g/mol
Concentration = 0.387 mg/L =
=
mol/L
And, density =
= 1 kg/L
Hence, molality =
=
mol/kg
Now, Molar mass of nitarte = 62 g/mol
Concentration = 1352.2 mg/L
= 
= 0.02181 mol/L
Also, density =
= 1 kg/L
Hence, molality will be calculated as follows.
Molality =
= 0.02181 mol/kg
Therefore, molality of given species is
for ammonia,
mol/kg for nitrite, and 0.02181 mol/kg for nitrate ion.
If Ka for HBrO is 2. 8×10^−9 at 25°C, then the value of Kb for BrO− at 25°C is 3.5× 10^(-6).
<h3>
What is base dissociation constant?
</h3>
The base dissociation constant (Kb) is defined as the measurement of the ions which base can dissociate or dissolve in the aqueous solution. The greater the value of base dissociation constant greater will be its basicity an strength.
The dissociation reaction of hydrogen cyanide can be given as
HCN --- (H+) + (CN-)
Given,
The value of Ka for HCN is 2.8× 10^(-9)
The correlation between base dissociation constant and acid dissociation constant is
Kw = Ka × Kb
Kw = 10^(-14)
Substituting values of Ka and Kw,
Kb = 10^(-14) /{2.8×10^(-9) }
= 3.5× 10^(-6)
Thus, we find that if Ka for HBrO is 2. 8×10^−9 at 25°C, then the value of Kb for BrO− at 25°C is 3.5× 10^(-6).
DISCLAIMER: The above question have mistake. The correct question is given as
Question:
Given that Ka for HBrO is 2. 8×10^−9 at 25°C. What is the value of Kb for BrO− at 25°C?
learn more about base dissociation constant:
brainly.com/question/9234362
#SPJ4