Which solution has a molality of 0.25m nacl?

Answers

Answer 1

Answer:

Molality can be expressed by moles of solute over kilograms of solvent. The question asks the molality of 0.25m NaCl. 0.25m NaCl is equal to 0.25 moles of NaCl over 1 kg of water.

Answer 2

Answer:

0.25 moles of NaCl over 1 kg of water

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Water is called the “universal solvent.” Which statement best explains this description with respect to ionic compounds?

Answers

Answer is: C. Water can dissociate many ionic compounds through ion-dipole interactions.

For example, dissociation of potassium bromide: KBr(aq) → K⁺(aq) + Br⁻(aq).

Some ionic compounds cannot dissociate in water, for example calcium sulfate (CaSO₄), silver chloride (AgCl), lead(II)-carbonate (PbCO₃).

An ion-dipole is electrostatic interaction between a charged ion (cations and anions) and a molecule that has a dipole (in this example water).

Dipole is a separation of positive and negative charges. In water, hydrogen has positive and oxygen has negative charge.

It is called the universal solvent because it can dissolve a wide range of solutes. Generally speaking, water is good at dissolving ions and polar molecules, but poor at dissolving nonpolar molecules. Water molecules are polar, with partial positive charges on the hydrogens, a partial negative charge on the oxygen, and a bent overall structure. The unequal charge distribution in a water molecule allows the interaction with ions.

17 Two substances in a mixture differ in density and particle size. These properties can be used to(1) separate the substances(2) chemically combine the substances
(3) determine the freezing point of the mixture
(4) predict the electrical conductivity of the mixture

Answers

Answer:The correct answer is option (1).

Explanation:

Density is defined as mass of substance present in the unit volume of the substance.

Density can be used to separate two substance from their mixture. Substance with lower density will place itself on the top of the substance with higher density, And in order to distinguish those two substance from each other one can easily observe the boundary among those substance.

If they're different sizes and densities, you are able to separate the substances.

The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution?0.113 M
0.151 M
6.62 M
11.3 M

Answers

Answer:

Molarity = 0.1516 mol.L⁻¹

Solution:

Molarity is the amount of solute dissolved per unit volume of solution. It is expressed as,

Molarity = Moles / Volume of Solution ----- (1)

Data Given;

Mass = 8.45 g

Volume = 0.750 L

Step 1: Calculate Moles for given mass as,

Moles = Mass / M.mass

Moles = 8.45 g / 74.55 g.mol⁻¹

Moles = 0.1133 mol

Step 2: Calculating Molarity:

Now, putting value of Moles and Volume in eq. 1,

Molarity = 0.1133 mol ÷ 0.750 L

Molarity = 0.1516 mol.L⁻¹

Molar concentration or molarity is defined as the ratio of moles of a solute dissolved in the given volume of the solvent.

How do you calculate the molarity using the formula?

Given:

Molar mass of Potassium Chloride = 74.55 g/mol
Given the mass of Potassium Chloride = 8.45 g
The volume of the solution = 0.750 L

Now, to calculate the number of moles, we get:

$\rm Moles &=(Mass)/(Molar Mass)\n\n\nMoles &= (8.45)/(74.55)\n$

Moles = 0.113 mol

Then, the molarity of the solution will be:

$\rm Molarity &= (number \; of \; moles)/(Volume\;of \; Solution)\n\n\n\rm Molarity &= (0.113)/(0.151)$

Molarity = 0.1516 mol/L

Thus, the molarity of the given solution is 0.1516 mol/L. The correct answer is Option B.

Learn more about molarity here:

brainly.com/question/12127540

Compute 4.659×104−2.14×104. Round the answer appropriately.

Answers

The answer is 2.519 × 10^4. Use the distributive property: a × x + b × x = (a + b) × x. If a = 4.659, b = 2.14, and x = 10^4, then 4.659 × 10^4 − 2.14 × 10^4 = (4.659 - 2.14) × 10^4. Now, subtract numbers in parenthesis: 4.659 × 10^4 − 2.14 × 10^4 = (4.659 - 2.14) × 10^4 = 2.519 × 10^4.Hope this helps. Let me know if you need additional help!

Suppose you wanted to dissolve 109 g of sodium carbonate in enough water to make 6.00 L of solution. What is the molarity of this solution?

Answers

Molarity

a. Na2CO3
Molar mass = 106 g/mol
n= 109 g / (106 g/mol) = 1.028 mol

b. 6.00L

c. M=n/V
M = 1.028 mol / 6.00 L
M= 0.1713 mol / L

Answer: The molarity of the sodium carbonate solution is 0.1713 mol/L

Summarizes the relationship between dehydration reactions and hydrolysis

Answers

Explanation:

Dehydration reaction is removal of water from a specie to give 2 distinct molecules. Dehydration reactions are common processes, the reverse of a hydration reaction. Examples of dehydrating agents are: sulfuric acid, alumina etc.

Hydrolysis reaction is the reaction of water molecules with a large molecule. Sometimes, this addition causes both substance and water molecule to split into two products, reactions like this, one fragment of the parent molecule gains a hydrogen ion.

The difference between dehydration synthesis and hydrolysis is that in one, bonds are being formed, while in the other bonds are being destroyed. In dehydration reaction, molecules are bonded together by removing water while in hydrolysis, water is added to the molecules in order to dissolve complex bonds.

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