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3 years ago

Which is a chacteristic of a solution?

Chemistry

1 answer:

Setler [38]3 years ago

8 0

Answer:

A solution is a homogeneous mixture of two or more substances. The particles of solute in a solution cannot be seen by the naked eye. A solution does not allow beams of light to scatter.

Explanation:

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What is the molarity of a 3.0-liter solution that contains 0.45 moles of solute

sergeinik [125]

Moles = n/v where n is the moles of solute and v being the liters of solution.
We can put in the information provided to find the molarity.

Moles = .45/3.0 = .15
So we now know that the molarity of that solution is .15!
I hope I helped you :). Make sure to memorize that formula because it's not that hard as long as you know what to plug in.

6 0

3 years ago

Read 2 more answers

1 mol super cooled liquid water transformed to solid ice at -10 oC under 1 atm pressure.

Arada [10]

Answer:

Explanation:

Given that:

number of moles of super cooled liquid water = 1

Melting enthalpy of ice = 6020 J/mol

Freezing point =0 °C = (0 + 273 K)= 273 K

The decrease in entropy of the system during freezing for 1 mol (i.e during transformation from liquid water to solid ice ) = - 6020 J/mol × 1 mol /273 K = -22.051 J/K

Entropy change during further cooling from 0 °C (273 K) to -10 °C (263 K)

$\Delta \ S = \int\limits^{T_2}_{T_1}\dfrac{nC_p(s)dT}{T}$

$\Delta \ S = {nC_p(s)In \dfrac{T_2}{T_1}$

$\Delta \ S = {(1*37.7)In \dfrac{263}{273}$

Δ S = -1.4 J/K

Total entropy change of the system = - 22.05 J/K - 1.4 J/K = - 23.45 J/K

Entropy change of universe = entropy change of the system+ entropy change of the surrounding

According to the second law of thermodynamics

Entropy change of universe >0

SO,

Entropy change of the system + entropy change in the surrounding > 0

Entropy change in the surrounding > - entropy change of the system

Entropy change in the surrounding > - (- 23.53 J/K)

Entropy change in the surrounding > 23.53 J/K

b) Make some comments on entropy changes from the obtained data.

From the data obtained; we will realize that the entropy of the system decreases as cooling takes place when water is be convert to ice , randomness of these molecules reduces and as cooling proceeds , hence, entropy reduces more as well and the liberated heat will go into the surrounding due to this entropy of the surrounding increasing.

4 0

3 years ago

How many moles of water can be obtained from the reaction of 4 moles of O2?

Yuliya22 [10]

Answer: 8moles

Explanation:

The reaction below shows the formation of 2 moles of water from 2 moles of hydrogen and 1 mole of oxygen respectively.

2H2(g) + O2 (g) --> 2H2O(l)

So, if 1 mole of O2 produce 2 mole of H2O

4 moles of O2 will produce Z mole of H2O

To get the value of Z, cross multiply

1 x Z = 4 x 2

Z = 8

So, the equation will be 8H2(g) + 4O2 (g) --> 8H2O(l)

Thus, 4 moles of O2 will produce 8moles of H2O .

6 0

3 years ago

How many molecules of Carbon<br> Dioxide (CO2) are there in 2 CO2?

Dima020 [189]

There are 2 molecules of Carbon dioxide(CO2)

<h3>Further explanation</h3>

Given

Molecules of CO2

Required

The number of molecules

Solution

The coefficient of a molecule shows the number of that molecule, while the subscript after the name of the atom indicates the number of that atom in the molecule

Because there is a coefficient of 2 in front of the CO2 molecule, then the number of CO2 molecules is 2

5 0

3 years ago

Use the following equation to determine how many moles of C are needed to react with 0.500 mole of SO2.

Maru [420]

Answer:

The answer to your question is 1.25 moles of C

Explanation:

Reaction

5C + 2SO₂ ⇒ CS₂ + 4CO

Check that the reaction is balanced

Reactant Element Product

5 C 5

2 S 2

4 O 4

Use proportions to find the moles of C needed.

5 moles of C ----------------- 2 moles of SO₂

x moles of C ---------------- 0.500 moles of SO₂

x = (0.500 x 5) / 2

x = 1.25 moles of C

8 0

3 years ago