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3 years ago

A 1.34 mole sample of LiCl dissolves in water, The volume of the final

Chemistry

1 answer:

Mamont248 [21]3 years ago

0 0

Answer:

$1.56 \,\,mol/L$

Explanation:

Molarity of the solution measures number of moles of a solute per litre of solution.

Molarity = volume of solution in litres/number of moles of solute dissolved in solution

Volume of solution in litres = 0.86 L

Also, 1.34 mole sample of LiCl dissolves in water

So,

Molarity of the Solution = $\frac{1.34}{0.86}=1.56 \,\,mol/L$

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Hydrophobic molecules (like oil) tend to self-associate in water rather than dissolve. What is the MAJOR energetic contribution

anyanavicka [17]

Answer: The MAJOR energetic contribution to this property is the self association that maximizes the entropy of the water molecules.

Explanation:

Hydrophobic molecules (like oil) tend to self-associate in water rather than dissolve in it. The MAJOR energetic contribution to this property is the self association of this oil which increases the degree of disorderliness of the water molecules.

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Which of the following phase changes only occurs in solids possessing vapor pressures above atmospheric pressure and at ambient

GuDViN [60]

Answer: The phase change process in which solids gets converted to gases is sublimation.

Explanation:

For the given options:

Option a: Condensation

It is a type of process in which phase change occurs from gaseous state to liquid state at constant temperature.

$Gas\rightleftharpoons Liquid$

Option b: Melting

It is a type of process in which phase change occurs from solid state to liquid state at constant temperature.

$Solid\rightleftharpoons Liquid$

Option c: Sublimation

It is a type of process in which phase change occurs from solid state to gaseous state without passing through the liquid state at constant temperature.

$Solid\rightleftharpoons Gas$

Option d: Deposition

It is a type of process in which phase change occurs from gaseous state to solid state without passing through the liquid state at constant temperature.

$Gas\rightleftharpoons Solid$

Hence, the phase change process in which solids gets converted to gases is sublimation.

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3 years ago

How many atoms of oxygen are in 0.100 mol of silicon dioxide?

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1) Silicon dioxide formula: SiO2 ....... 2 is a subscript for the O atom

2) From the formula you have 1 molecula of SiO2 contains 1 atom of SiO2

3) Then, 0.100 mol of SiO2 contains 0.1 mol of Si

4) Multiply by Avogadro's number: 0.100mol * 6.022*10^23 atoms/mol= 6.02*10^22 atoms

Answer: 6.02*10^22 atoms

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3 years ago

Which tools would be necessary to determine whether or not a large regular block will float, without using water?

bulgar [2K]

Scale and measuring tape.
To determine the mass and volume, you can find the density. The block will float if its density is less than that of water.

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3 years ago

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Which reactions are oxidation-reduction reactions? check all that apply. fes(s) 2hcl(aq) â†’ h2s(g) fecl2(g) agno3(aq) nacl(aq)

Dafna1 [17]

oxidation-reduction reactions are -

2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(g)
Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

For reaction,

2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(g)

On reactant side:

Oxidation state of Carbon = +2

Oxidation state of Oxygen = 0

On product side:

Oxidation state of Carbon = +4

Oxidation state of Oxygen = -2

Here, carbon's oxidation state is rising from +2 to +4. As a result, it is oxidizing and the oxygen's oxidation state is decreasing from 0 to -2. As a result, it is decreasing.

For reaction,

Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

When reacting:

Iron's oxidation state is +3.

Carbon's oxidation state is +2.

On product side:

Iron's oxidation state is zero.

Carbon's oxidation state is +4.

Here, carbon's oxidation state is rising from +2 to +4. As a result, it is being oxidized and the iron's oxidation state is changing from +3 to 0. As a result, it is decreasing.

To learn more about oxidation-reduction from given link

brainly.com/question/5794822

#SPJ4

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2 years ago