The
balanced chemical reaction is 2Hg + O2 -> 2HgO. To calculate the delta G, we
use the formula: ΔG = ΔH – TΔS. The ΔH is computed by subtracting the
standard enthalpy of formation of the reactants from the products, multiplied
correspondingly with their stoichiometric coefficients. The same is to obtain ΔS.
The
necessary information all at 298 K are:
ΔH_Hg
= 0 kJ/mol; since it is at its standard state
ΔS_Hg
= 75.90 kJ/mol
ΔH_O2
= 0 kJ/mol; since it is at its standard state
ΔS_O2
= 0.161 kJ/mol K
ΔH_HgO
= -90 kJ/mol
ΔS_HgO
= 0.070 kJ/mol K
<span>Thus,
the delta G of reaction is -132.022 kJ. The negative value denotes a
spontaneous reaction. </span>
Answer:
(B) -125 kJ
Explanation:
Going by the First Law of Thermodynamics it states that"
<em>"A system can do work and increase it's internal energy provided we supply heat."</em>
ΔU= q+w-----------1
where U= the internal heat
q= the quantity of heat added or removed from the system
w= the work done
Given
ΔU= 250kJ
q= 375kJ
from equation 1 make w subject of the formula we have
w= ΔU-q
w= 250-350
w= -125kJ
Molarity is the strength of the solution or the ratio of the moles and the volume of the solution. The molarity of the solution is 0.1516 mol per Liter.
<h3>What is molarity?</h3>
Molarity is the molar concentration of the solution that tells about the amount of the solute or the substance dissolved in the given amount of the solution.
Given,
- Mass of potassium chloride = 8.45 g
- Molar mass of potassium chloride = 74. 55 g/mol
- Volume of the solution = 0.750 L
Moles can be calculated by:
Calculate molarity by:
Substituting values in the equation:
Therefore, the molarity of the solution is 0.1516 mol per Liter.
Learn more about molarity here:
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