What mass of K2SO4 would you measure out to prepare 550 ml of a 0.76 M solution

Answers

Answer 1

Answer:

Taking into account the definition of molarity, you would measure out 72.732 g of K₂SO₄ to prepare 550 ml of a 0.76 M solution.

Definition of molarity

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

$molarity=(number of moles)/(volume)$

Molarity is expressed in units $(moles)/(liters)$ .

Mass of K₂SO₄

In this case, you prepare 550 ml of a 0.76 M solution. This is, you know:

Molarity= 0.76 M
number of moles= ?
volume= 550 mL= 0.550 L

Replacing in the definition of molarity:

$0.76 M=(number of moles)/(0.550 L)$

Solving:

number of moles= 0.76 M × 0.550 L

number of moles= 0.418 moles

Being the molar mass of K₂SO₄ 174 $(g)/(mole)$ , that is, the amount of mass that the compound contains in one mole, the mass contained in 0.418 moles is calculated as:

0.418 moles×174 $(g)/(mole)$ = 72.732 g

Finally, you would measure out 72.732 g of K₂SO₄ to prepare 550 ml of a 0.76 M solution.

Learn more about molarity:

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Answer 2

Answer:

Answer:

$m_(K_2SO_4)=72.84gK_2SO_4$

Explanation:

Hello,

In this case, by considering that the both the volume of the solution of potassium sulfate and its concentration are given, one solves for the required mass considering the following proportional factors related stoichiometrically:

$m_(K_2SO_4)=550mLsln*(1Lsln)/(1000mLsln)*0.76(molK_2SO_4)/(Lsln)*(174.259gK_2SO_4)/(1molK_2SO_4)\n m_(K_2SO_4)=72.84gK_2SO_4$

Best regards.

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3. How many atoms are found in 0.000256 moles?

Answers

Answer:

1.54×10^20 atoms

Explanation:

It'sdonebyusingtherelation

N=n×Lwhere,

N=numberofentitiespresent

n=amountofsubstance (mole)

L=Avogadro'sconstantwhichis6.02×10^23

nowfromthequestion, given

n=0.000256

AndL=6.02×10^23

N=0.000256×6.02×10^23

N=1.54×10^20atoms

Earth's first semi-permanent atmosphere consisted of abundant water vapor, carbon dioxide, nitrogen, ammonia, and traces of methane. these gases came from

Answers

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You are on an alien planet where the names for substances and the units of measures are very unfamiliar. Nonetheless, you obtain 69 quibs of a substance called skvarnick. You can trade this Skvarnick for gold coins, but the vendors all measure skvarnick units of sleps; not quibs. 9 sleps is equal to 6 quibs. If you have 14 quibs of skvarnick, how many sleps do you have? Round your answer to the nearest tenth (one decimal place). Type only the number; not the number and unit.

Answers

Answer: 21 sleps

Explanation:

Given information: The substance skvarnick can be traded for gold coins in units of sleps and not quibs. Thus we need to convert the units of quibs to sleps.

It is given that 9 sleps is eqaul to 6 quibs, 14 quibs = ____ sleps.

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$14\text{ quibs} = (9)/(6)* {14}\text{ sleps}$

$=21\text{ sleps}$

Based on the law of Conservation of Mass, what happens to the mass of a substance in a chemical change? A: the mass is always conserved B: The mass is either created or destroyed C: the reactant always has more mass D: the product always has more mass

Answers

Answer:

Explanation:

The amount of mass always stays the same, matter cannot be created nor destroyed, it can only change forms. Thus, the answer is A.

In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.

I hope this helps..

isotopes are atoms that contain the same number of protons but a different number of neutrons in their nuclei. based on this information, which statement about isotopes is true? a. isotopes are atoms of the same element. b. isotopes are atoms that have the same mass number. c. isotopes are atoms of different elements that have similar chemical and physical properties. d. isotopes are atoms of different elements that belong to the same family on the periodic table.

Answers

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What kind of particles make up compound

Answers

compounds are composed of elements

elements are composed of sub atomic particles such as electrons and proton

A compound is made of of 2 or more elements. Elements are made up of atoms. So compounds are also made up of atoms because they are made up of elements.

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