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Mice21 [21]
3 years ago
14

Which substance would you most likely need to cool to the lowest temperature before it condenses?

Chemistry
2 answers:
melamori03 [73]3 years ago
5 0

the answer is: B. ethane (C2H6), a nonpolar covalent compound

Goryan [66]3 years ago
4 0
Schwarzschild Radius here.

So,

The real questions is "Which compound has the lowest boiling point?"  The answer would be the compound with the lowest intermolecular attractions.

Typically, the hierarchy of intermolecular attractions is as follows:

Ionic >> polar covalent > nonpolar covalent

Ionic compounds typically have very high boiling points, because melting them involves inputting enough energy to rip apart the positive and negative ions.  Sodium chloride, for example, has a boiling point of 1413°C.  So potassium bromide would probably have the highest boiling point.

Polar covalent compounds typically have boiling points closer to room temperature.  The most familiar polar covalent compound is water, with a boiling point of 100°C.  Ammonia is actually similar to water in that its primary intermolecular attraction is hydrogen bonding.

Nonpolar covalent compounds typically have the lowest boiling points.  Small alkanes/alkenes/alkynes have very low boiling points.  Their main intermolecular attraction is London dispersion forces, which are directly proportional to molecular mass, and thus are very weak in molecules such as methane, ethane/ethene, propane/propene, etc.  Thus, we can expect ethane to have the lowest boiling point.

Hope this helps!
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3 years ago
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What is the molality of a solution containing 3. 0 moles of nacl and 100. 0 moles of water?
Mama L [17]

The molality of a solution containing 3. 0 moles of NaCl and 100. 0 moles of water is 30 mol/kg.

The number of moles of solute in a solution equal to 1 kg or 1000 g of solvent is referred to as its molality. Mole per kilogram of solvent is the SI unit for molality.

Given:

3.0 moles of NaCl in 100 moles of water.

To find:

The molality of the solution

The moles of solute (NaCl) = 3.0 moles

The mass of solvent (water) = 100 moles (0.1 kg/mol)

Molality of a solution = Number of Moles of solute/ Mass of solvent(kg)

                                 = 3.0 moles/0.1 kg/mol

                                 = 30 mol/kg

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4 0
1 year ago
When the temperature of a sample of pure water is raised above 25 °C,(1)the hydronium ion concentration will be greater than the
Ludmilka [50]

Answer:

The correct answer is option 3.

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The expression of K_w is given by :

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K_w\propto [OH^-]

Rise in temperature will result in more dissociation of water molecules into hydrogen ions and hydroxide ions.

With an increase in concentration of hydrogen ions and hydroxide ions value of K_w will also increase.

5 0
3 years ago
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