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3 years ago

What is the boiling point elevation equation

2 answers:

7 0

ΔTb = Kb · bBΔTb, the boiling point elevation, is defined as Tb (solution) - Tb (pure solvent).Kb, the ebullioscopic constant, which is dependent on the properties of the solvent. It can be calculated as Kb = RTb2M/ΔHv, where R is the gas constant, and Tb is the boiling temperature of the pure solvent [in K], M is the molar mass of the solvent, and ΔHv is the heat of vaporization per mole of the solvent.bB is the molality of the solution, calculated by taking dissociation into account since the boiling point elevation is a colligative property, dependent on the number of particles in solution. This is most easily done by using the van 't Hoff factor i as bB = b solute · i. The factor i accounts for the number of individual particles (typically ions) formed by a compound in solution.

Mrac [35]3 years ago

6 0

The result is that in dilute ideal solutions, the extent of boiling-point elevation is directly proportional to the moral Concentration of the solution according to the equation: ΔTb = K. b. ΔTb, the boiling point elevation, is defined as Tb (solution) - Tb (pure solvent).

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4 years ago

A good experimental design should always:

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3 years ago

In a reversible reaction, the endothermic reaction absorbs ____________ the exothermic reaction releases. A. less energy than B.

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Answer: C. the same amount of energy as

Explanation:

A reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.

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$A+B\rightleftharpoons C+D$

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5 0

3 years ago

A chemical test has determined the concentration of a solution of an unknown substance to be 2.41 M. a 100.0 mL volume of the so

Oksana_A [137]

Answer : The molar mass of unknown substance is, 39.7 g/mol

Explanation : Given,

Mass of unknown substance = 9.56 g

Volume of solution = 100.0 mL

Molarity = 2.41 M

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

$\text{Molarity}=\frac{\text{Mass of unknown substance}\times 1000}{\text{Molar mass of unknown substance}\times \text{Volume of solution (in mL)}}$

Now put all the given values in this formula, we get:

$2.41M=\frac{9.56g\times 1000}{\text{Molar mass of unknown substance}\times 100.0mL}$

$\text{Molar mass of unknown substance}=39.7g/mol$

Therefore, the molar mass of unknown substance is, 39.7 g/mol

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3 years ago