CHEMISTRY HIGH SCHOOL

Molar mass CO2 is 44.01 g/mol. How many moles of LiOH are needed to react completely with 25.5 g of CO2?

Answers

Answer 1

Answer:

Given:

Molar mass CO2 is 44.01 g/mol

25.5 g of CO2

Required:

Moles of LiOH

Solution:

Balanced equation is:

2LiOH +CO2 → Li2CO3 + H2O

25.5g CO2 (1 mole CO2/44.01 g/mol CO2)(2 moles LiOH/1 mol CO2) = 1.16 moles LiOH

Answer 2

Answer:

Molarmass carbon dioxide is 44.01 g/mol, 1.16 moles of LiOH are needed to react completely with 25.5 g of CO₂.

Stoichiometry and the molar ratios of CO₂ and LiOH must be used to calculate the number of moles of LiOH required to totally react with 25.5 g of CO₂.

The reaction between CO₂ and LiOH has the following chemical formula:

CO₂ + 2LiOH -> Li₂CO₃ + H₂O

Now,

Molar mass of CO₂ = 44.01 g/mol

Mass of CO₂ = 25.5 g

Number of moles of CO₂ = Mass of CO2 / Molar mass of CO2

= 25.5 g / 44.01 g/mol

≈ 0.58 moles of CO2

As per this,

Number of moles of LiOH = 2 * Number of moles of CO2

= 2 * 0.58 moles

= 1.16 moles of LiOH

Thus, 1.16 moles of LiOH are needed for the given reaction.

For more details regarding molar mass, visit:

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Atoms A and X are fictional atoms. Suppose that the standard potential for the reduction of X^2+ is +0.51 V, and the standard potential for the reduction of A^2+ is -0.33. Find the standard potential for an electrochemical cell with the cell reaction that follows.

Answers

Answer: Thus the standard potential for an electrochemical cell with the cell reaction that follows is 0.84 V.

Explanation:

Standard potential for an electrochemical cell is given by:

$E^0{cell}$ = standard electrode potential = $E^0{cathode}-E^0{anode}$

The $E^0$ values have to be reduction potentials.

Given: Reduction potential for atom X:

$E^o_(X^(2+)/X)=+0.51V$

$E^o_(A^(2+)/A)=-0.33V$

The element A with negative reduction potential will lose electrons undergo oxidation and thus act as anode.The element X with positive reduction potential will gain electrons undergo reduction and thus acts as cathode.

$X^(2+)+A\rightarrow X+A^(2+)$

$E^0{cell}$ = standard electrode potential = $E^0{cathode}-E^0{anode}=+0.51-(-0.33)=0.84V$

Thus the standard potential for an electrochemical cell with the cell reaction that follows is 0.84 V.

If you are given the standard potential for the reduction of X^2+ is +0.51 V, and the standard potential for the reduction of A^2+ is -0.33, just add the two. The standard potential for an electrochemical cell with the cell is 0.18V

Crystalline solids do not have a sharp melting point.

TRUE

FALSE

Answers

Answer:

False

Explanation:

A crystalline solid has a well ordered structure. The particles that make up the solid are arranged in a regular repeating pattern. When the solid is heated, this structure gives way, in order words, the solid melts.

Pure solids crystals are known to have sharp melting points. This is a property of crystalline solids.

The statement about “Crystalline solids do not have a sharp melting point” is false. Crystalline solids are solids that have particles arranged in a regular, repeating patterns. They are held together by uniform intermolecular forces. The faces intersect at a specific angle that identifies that substance. They have distinctive internal structures that in turn lead to distinctive flat surfaces. These flat surfaces give a short rage order. When exposed to x – ray diffractometers, they exhibit a distinctive pattern used to identify the material. They give the same face when you turn a crystalline solid around

Compared to a 2.0 M aqueous solution of NaCl at 1 atmosphere, a 3.0 M aqueous solution of NaCl at 1 atmosphere has a(1) lower boiling point and a higher freezing point
(2) lower boiling point and a lower freezing point
(3) higher boiling point and a higher freezing point
(4) higher boiling point and a lower freezing point

Answers

The correct answer is option 4. A 3.0 M aqueous solution of NaCl has a higher boiling point and a lower freezing point than a 2.0 M aqueous solution of NaCl where both are at 1 atmosphere. This is explained by the colligative properties of solutions. For the two properties mentioned, the equation for the calculation of the depression and the elevation is expressed as: ΔT = -Km and ΔT = Km, respectively. As we can see, concentration and the change in the property has a direct relationship.

Which element has the greatest average atomic mass?

Answers

The awnser is Hydrogen. It had the greatest average atomic mass

I need to know the answer for number two. * I

Answers

Answer:

The answer to your question is (C). I would work out the question for you lad, but I don't know how to do it on here.

Explanation:

Which of the following is not a diatomic molecule? nitrogen hydrogen bromine helium

Answers

Answer: Option (d) is the correct answer.

Explanation:

When two atoms are bonded together then it is known as a diatomic molecule.

Such as nitrogen exists as $N_(2)$ molecule in atmosphere so, it is a diatomic molecule.

Hydrogen also exists as $H_(2)$ molecule in atmosphere so, it is also a diatomic molecule. Also, bromine is a diatomic molecule because it exists as $Br_(2)$ molecule into the atmosphere.

But helium exists as He molecule as it has 2 electrons so, as per the octet rule it's s-shell is completely filled. Hence, it is stable and exists as a monoatomic molecule into the atmosphere.

Thus, we can conclude that out of the given options, helium is not a diatomic molecule.

Answer:

HELIUM

That's your answer!!

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