You dissolve 0.74 g of potassium chloride (KCl) in 500 mL of water. What is the molarity of the solution?

Answers

Answer 1

Answer:

There are a number of ways to express concentration of a solution. This includes molarity. Molarity is expressed as the number of moles of solute per volume of the solution. The concentration of the solution is calculated as follows:

Molarity = 0.74 g (1 mol / 74. 55 g) / 500mL (1 L / 1000 mL)

Molarity = 0.02 M

Answer 2

Answer:

Answer:

0.02 M is the answer

Explanation:

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In which type of solution does an equilibrium always exist?

Answers

You could argue that any solution with water in it has an equilibrium in it of some sort. If a solution is over saturated there is an equilibrium between the dissociated and solid solute (for example NaCl(s)⇄Na⁺(aq)+Cl⁻(aq) when in water). Even if the solution is not over saturated, water always has the reaction 2H₂O(l)⇄H₃O⁺(aq)+OH⁻(aq) since water can act as both an acid and a base (this reaction is also always at equilibrium and the equilibrium constant is 1×10⁻¹⁴).

Since we usually ignore the autoionization of water (unless dealing with acid base chemistry), I think the answer your teacher is looking for is over saturated solutions.

I hope this helps. Let me know if anything is unclear or if you need a different answer.

Which formula represents an ionic compound?
(1) H2 (3) CH3OH
(2) CH4 (4) NH4Cl

Answers

Answer is: (4) NH4Cl.

Name of this chemical copmpound is ammonium chloride.

Ammonium chloride (NH₄Cl) is chemical compound with neutral charge.

1) Hydrogen (H) has oxidation number +1 in compounds with nonmetals (nitrogen and chlorine).

2) Chlorine has oxidation number -1, because ammonium ion (NH₄⁺) has positive charge.

3) In ammonium cation (NH₄⁺), nitrogen has higher electronegativity than hydrogen, so it has negative oxidation number -3:

x + 4 · (+1) = +1.

x = 1 - 4.

x = -3; oxidation number of nitrogen.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Other molecules have covalent chemical bonds.

An ionic compound is formed when there is a transfer of electrons between two atoms. The formula for an ionic compound is usually written as the combination of the symbols of the two ions. (4) NH4Cl represents an ionic compound as it follows the criteria of an atom losing or gaining electrons.

An ionic compound is formed when there is a transfer of electrons between two atoms. In an ionic compound, one atom will lose electrons to become a positively charged ion, while the other atom will gain those electrons to become a negatively charged ion. The formula for an ionic compound is usually written as the combination of the symbols of the two ions.

Out of the given options, (4) NH4Cl represents an ionic compound. In this formula, the ammonium ion (NH4+) loses one electron to become positively charged, and the chloride ion (Cl-) gains that electron to become negatively charged.

Learn more about Ionic compounds here:

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Molecules in a sample of NH3 are held closely together by intermolecular forces

Answers

The forces in NH3 includes the vanderwaals force which will always be present and hydrogen bonding due to the electronegativity of N as compared to H. When it is in solution, there will be ionic interactions because there will be some NH4+ ions formed.

Calculate the percentage of yield when 20 grams of sodium chloride solution reacts with an excess amount of silver nitrate solution knowing that 45 grams of silver chloride precipitated

Answers

Percentage % yield = 91.8%

Given:

20 g NaCl

45 g AgCl

To find:

% yield=?

The balanced chemical equation will be:

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

First, we need to calculate moles of NaCl.

$\text{Number of Moles}=\frac{\text{Given Mass}}{\text{Molar Mass}} \n\n\text{Number of Moles}=(20)/(58.44) \n\n\text{Number of Moles}= 0.342 moles$

Then, calculate moles of AgCl from equation:

$\text{mol of AgCl}= 1/1 * \text{ mol NaCl}\n\n\text{mol of AgCl}= 1/1 * 0.342\n\n\text{mol of AgCl}= 0.342$

Mass AgCl(theoretical) :

$\text{Mass of AgCl}= mol * MW\n\n\text{Mass of AgCl}= 0.342 x 143,32 g/mol\n\n\text{Mass of AgCl}= 49.02 g$

Now, calculate for percentage yield.

$\%yield =(actual)/(theoretical) * 100\%\n\n\%yield = (45/49.02) * 100\%\n\n\%yield = 91.8\%$

The percentage yield will be 91.8%.

Learn more:

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%yield = 91.8

Further explanation

Given

20 g NaCl

45 g AgCl

Required

%yield

Solution

Reaction

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

mol NaCl :

= mass : MW

= 20 g : 58,44 g/mol

= 0.342

mol AgCl from equation :

= 1/1 x mol NaCl

= 1/1 x 0.342

= 0.342

Mass AgCl(theoretical) :

= mol x MW

= 0.342 x 143,32 g/mol

= 49.02 g

%yield = (actual/theoretical) x 100%

%yield = (45/49.02) x 100%

%yield = 91.8

Hydrochloric acid (HCl) is combined with cesium hydroxide (CsOH) in a neutralization reaction. Which ions will combine to form a salt? Check all that apply.H+
H3O+
Cl-
Cs+
OH-

Answers

HCl + CsOH --> CsCl + H2O

So the ions making up the salt: Cl- and Cs+

Answer:

The answers are C and D

Explanation:

The ___________________ in the mouth secrete enzymes which help prepare the food for digestion in the stomach.a. teeth
B.tongue
C.salivary glands
D.pancreas

Answers

The salivary glands in the mouth secrete enzymes which help prepare the food for digestion in the stomach.

Answer: salivary glands

Explanation:

this is the correction i got 100% correct

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