Which of the following would not be defined as an acid A.KOH, B. HNO3, D. H3PO4 and why
1 answer:
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Answer:
Please see Explanation and Attachment (Heating Curve for Water)
Explanation:
Energy change associated with phase change in substances is either endothermic (energy added to system) or exothermic (energy removed from system). Condensation is but one term in six (6) describing phase change occurring when energy change is involved. The following table, in general, summarizes the related effects of energy change as applied to phase change.
Process Phase Change Energy Change*
Condensation gas => liquid Exothermic
Evaporation liquid => gas Endothermic
Freezing liquid => solid Exothermic
Melting solid => liquid Endothermic
Sublimation solid => gas Endothermic
Deposition gas => solid Exothermic
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* Energy Change terms:
Endothermic => Addition of heat energy
Exothermic => Removal of heat energy
Explanation:
1) Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.
To calculate the molar solubility, we use the equation given by Henry's law, which is:
where,
= Henry's constant
= partial pressure of gas
a)
Putting values in above equation, we get:
The solubility of helium gas is
b)
Putting values in above equation, we get:
The solubility of nitrogen gas is
2)
a) Mass of solute or methanol , m= 14.7 g
Mass of solvent or water , m'= 186 g
Mass of the solution = M = m + m' = 14.7 g + 186 g = 200.7 g
The mass percent of methanol is 7.32%.
b) Molality is defined as moles of solute per kilograms of solvent.
Moles of methanol =
Mass of solvent = 186 g = 0.186 kg
The molality of methanol is 2.4610 mol/kg.