More Concepts a. i. In the context of gas mixtures, what does P_i* stand for? ii
ID: 520161 • Letter: M
Question
More Concepts a. i. In the context of gas mixtures, what does P_i* stand for? ii. State "Dalton's Law of Partial Pressures" (precise!.) molecular explanation of the term "a" in the van der Waals equation. c. Assuming identical pressures and temperature: Which of the following substance(s), when in the gas state, is (are) denser than air: CH_4 (g), CO_2 (g), NH_3 (g), H_2 O(g), H_2 S(g), Cl_2 (g)? d. major type of IMF (intermolecular force) that exists in aqueous CaCl_2 solutions between the solvent and solute particles? Provide a sketch!Explanation / Answer
(a)
(i) In the mixture of gases, P* indicates the partial of the gas. (individual pressure when it is alone)
(ii) Dalton's Law of partial pressure:
The pressure exrted by the mixture of non reacting gases is equal to the sum of partial pressure exerted by each gas in the mixture when it is alone present.
Ptotal = P1 + P2 + P3 + P4 + ----------
(b)
vanderwaals equation, term 'a' indicates the intermolcular attractions among the gas molecules. It affects the pressure exerted by the gas than that is exerted in the absence of intermolecular attraction.
(c)
Density is dpendant on the molar mass of the gases if all other ocnditions are same.
So, Cl2 is more denser among the given gases. Its molar mass = 71 g/mol
(d) The major type of intermolecular forces that occur in aqueous CaCl2 are ion - dipole interaction. Hydration of ions takes place.
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