If 20.0 mL of Ca(OH)2 with an unknown concentration is neutralized by 37.5 mL of 0.124 M HCl, what is the concentration of the Ca(OH)2 solution? Show all of the work needed to solve this problem. Ca(OH)2 + 2 HCl yields 2 H2 O + CaCl2

Answers

Answer 1

Answer: You first need to write the balanced chemical reaction for what is going on.
Ca(OH)₂+2HCl→2H₂O+CaCl₂

After you make the balanced chemical reaction, First you find the moles of HCl used. To do this multiply 0.0375L by 0.124M to get 0.00465mol HCl. Then you multiply 0.00465mol HCl by (1mol Ca(OH)₂)/(2mol HCl) to get 0.002325mol Ca(OH)₂. Finally to find concentration of Ca(OH)₂ used you divide 0.002325mol by 0.020L to get 0.116M Ca(OH)₂.
Therefore the concentration of the unknown solution of Ca(OH)₂ was 0.116M.

I hope this helps. Let me know if anything is unclear.

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What is the formula for Mg+AgNO3?

Answers

$Mg+2AgNO3 gives ( MgNO3)2+2 Ag$

$Mg+2AgNO_(3)-->(MgN O_(3)) _2+2Ag$

How might we one day be able to prove the absence of God through science?

Answers

You will never, I believe that the Almighty wouldn't allow this to happen. This is just my belief though. You will have to go to your parents of read up on it your self to really be able to see if there is a way. Ask yourself the question, How am I breathing? Next, ask yourself Were is air provided from? Who provides the air you breath. You really just have to check and look into it your spirit and ask yourself Do I believe in there being a absence of God(which ever god you serve)? If you reply no than science no matter how hard they try will not be able to disprove God.

by the eveloution of the big bang theory

The elements of which group are nonreactive?

Answers

The elements react with other element and form compounds in order to complete their octet (possess 8 electrons in their valence shell) and attain stability. The formation of compounds by the elements can take place by either sharing of electrons or transfer of electrons from one atom to other atom. The elements whose octet is complete that means those elements which has eight electrons in their valence shell are nonreactive as they are already stable due to completion of octet.

In periodic table, the elements of group 18 (Noble gas) have their octet completely filled and are stable in the elemental form. Thus, the elements of group 18 (helium, neon, argon, krypton, xenon, radon, and oganesson) are nonreactive.

Final answer:

The noble gases in Group 18 are nonreactive due to their filled valence shells, but exceptions to this rule have been discovered

Explanation:

The elements in Group 18, also known as the noble gases (helium, neon, argon, krypton, xenon, and radon), are nonreactive. They have filled valence shells, which makes them stable and unreactive. However, it's important to note that this assumption was proven false by Dr. Neil Bartlett in 1962 when he discovered that some noble gases can react under certain conditions.

Thus, these specific gases are a group of chemical elements found in Group 18 of the periodic table and are typically characterized by their overall stability and lack of reactivity, making them useful in applications like lighting, lasers, and cryogenics.

Learn more about nonreactive elements in Group 18 here:

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Assume that 13.5 g solid aluminum (Al) react with HCl to produce solid aluminum chloride (AlCl3) salt and gaseous hydrogen (H2) at standard temperature and pressure.How many moles of Al react?

How many moles of H2 are produced?

How many liters of H2 are produced?

Answers

0.5 moles $\bold {Al}$ is required for the given reaction to occur. Mole is a constant that represents a certain amount of particles such as atoms, ions, or molecules.

What is the Mole concept?

It is the number or constant that represents a certain amount of particles such as atoms, ions, or molecules.

1 mole = $6.02 * 10^2^3$ particles.

$n = \frac wm$

Where,

$n$ - number of moles

$w$ - given mass = 13.5 g.

$m$ - molar mass = 26.98 g/mol.

Put the values in the formula,

$n = \frac {13.5} {26.98}\n\nn = 0.5\rm \ mol.$

Therefore, 0.5 moles $\bold {Al}$ is required for the given reaction to occur.

Learn more about Mole concept:

brainly.com/question/7287712

Answer:

1) 0.5 mol.

2) 0.75 mol.

3) 16.8 L.

Explanation:

1) How many moles of Al react?

We can calculate the number of moles of Al (n) using the relation:

n = mass / molar mass,

Mass of Al = 13.5 g.

Molar mass mass of Al = 26.98 g/mol.

∴ The number of moles of Al (n) = mass / molar mass = (13.5 g) / (26.98 g/mol) = 0.5 mol.

2) How many moles of H₂ are produced?

It is a stichiometry problem.

We should write the balanced equation of the reaction:

2Al + 6HCl → 2AlCl₃ + 3H₂.

It is clear that 2.0 moles of Al reacts with 6.0 moles of HCl to produce 2.0 moles of AlCl₃ and 3.0 moles of H₂.

Using the cross multiplication:

2.0 moles of Al → 3.0 moles of H₂, from the stichiometry,

0.5 mole of Al → ??? moles of H₂.

∴ The number of moles of H₂ are produced = (0.5 mole)(3.0 mole) / (2.0 mole) = 0.75 mol.

3) How many liters of H₂ are produced?

It is known that at STP, 1.0 mole of any gas occupies a volume of 22.4 L.

Using cross multiplication:

1.0 mole occupies → 22.4 L.

0.75 mole occupies → ??? L.

∴The number of liters of H₂ are produced = (0.75 mole)(22.4 L) / (1.0 mole) = 16.8 L.

What is the mass percent of chlorine in magnesium chloride?

Answers

The total mass of magnesium chloride is 95.21g/mol

The mass of chlorine is 35.45g/mol

To find the mass percent of chlorine, divide its molar mass by the total mass of the substance and multiply the result by 100:
(35.45/95.21)(100)= 37.2%

Rank standard molar entropy without a data table? Without referring to a data table, rank the following compounds by standard molar entropy (highest to lowest). I can do it with a data table but not sure how to proceed without. Thank you for your help. N2(g) H2(g) C2H4(g)

Answers

I think the correct order from most entropy to least entropy is C2H4, N2, and H2. My reasoning is that C2H4 has the biggest number of microstates which means that it will have the most entropy since it. I then based N2 and H2 from there weights (which indicates size) since the larger something is the more microstates it is likely to have. I hope that helps. Let me know if anything is unclear or if you want me to add more detail.

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