How would I find the quantity of heat absorbed or released when 2.0g of LiOH is dissolved in 100g of H₂0 when the enthalpy of the solution is -23.6KJ/mol?

Answer:

definition: activity involving mental or physical effort done in order to achieve a purpose or result.

explanation: work is the energy transferred to or from an object via the application of force along a displacement. Work can mean many things depending on what you use it for.

The pH of the solution of the weak base here is 11.28.

We know that in this case, we have a weak base and we have been asked to obtain the pH of the solution. Let us note that the dissociation of the base would produce the hydroxide ion.

As such we have;

Ka = x^2/0.43 - x

x = concentration of the hydroxide ion

Then;

8.1 * 10^-6 = x^2/0.43 - x

8.1 * 10^-6(0.43 - x) = x^2

3.5 * 10^-6 - 8.1 * 10^-6x = x^2

x^2 +  8.1 * 10^-6x - 3.5 * 10^-6  = 0

x = 0.0019 M

pOH = -log( 0.0019)

= 2.72

pH = 14 - 2.72

= 11.28

Learn more about pH:https://brainly.com/question/15289714

#SPJ1

Answer:

Non-polar covalent bond

Explanation:

The bond between two nonmetal atoms is always covalent.

hope my answer helps you

The number of mole of ethanol burned, given the various data from the question is 0.17 mole

First, we shall obtain the mass of ethanol burned. This is shown below:

Mass of ethanol burned = (Mass of ethanol before burning) - (Mass of ethanol after burning)

Mass of ethanol burned = 70.3 - 62.5

Mass of ethanol burned = 7.8 g

Finally, we shall determin the number of mole of ethanol burned. Details below:

Mole = mass / molar mass

Number of mole of ethanol burned = 7.8 / 46

Number of mole of ethanol burned = 0.17 mole

Thus, the number of mole is 0.17 mole

Learn more about mole:

https://brainly.com/question/13314627

#SPJ1

Answer:

proton

Explanation:

Atoms are composed of a nucleus, containing protons and neutrons, surrounded by a cloud of electrons. The number of protons in the nucleus determines the identity of the atom

Answer:

1. The second option

Explanation:

Answer: The balanced reaction equation is:

4

F

e

(

s

)

+

3

O

2

(

g

)

→

2

F

e

2

O

3

(

s

)

Initial moles of oxygen reactant (given) =  

12.0

m

o

l

According to the balanced equation the iron and oxygen reactants combine in a 4:3 molar ratio. Therefore for complete consumption of both reactants we require:

Initial moles of iron reactant =  

4

3

×

12.0

m

o

l

=

16.0

m

o

l

The number of mole of Fe needed to react with 12 moles of O₂ is 16 moles

We'll begin by writing the balanced equation for the reaction. This is given below:

3O₂ + 4Fe —> 2Fe₂O₃

From the balanced equation above,

3 moles of O₂ reacted with 4 moles of Fe.

With the above information, we can obtain the number of mole of Fe required to react with 12 moles of O₂. This can be obtained as follow:

From the balanced equation above,

3 moles of O₂ reacted with 4 moles of Fe.

Therefore,

12 moles of O₂ will react with = \(\frac{12 * 4 }{3}\\\\\) = 16 moles of Fe

Thus, 16 moles of Fe are needed to react with 12 moles of O₂

Learn more: https://brainly.com/question/19484093

The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

for more such questions on symptom

https://brainly.com/question/21078887

#SPJ8

The molar mass of MgCrO4 is approximately 140.30 g/mol.

To determine the molar mass of MgCrO4 (magnesium chromate), we need to calculate the sum of the atomic masses of each individual element in the compound.

The chemical formula MgCrO4 indicates that the compound consists of one magnesium atom (Mg), one chromium atom (Cr), and four oxygen atoms (O).

The atomic masses of the elements can be found on the periodic table:

Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.

Chromium (Cr) has an atomic mass of around 51.99 g/mol.

Oxygen (O) has an atomic mass of about 16.00 g/mol.

Now, we can calculate the molar mass of MgCrO4 by summing up the atomic masses of each element, considering the respective subscripts:

Molar mass = (Atomic mass of Mg) + (Atomic mass of Cr) + 4 × (Atomic mass of O)

Molar mass = (24.31 g/mol) + (51.99 g/mol) + 4 × (16.00 g/mol)

Molar mass = 24.31 g/mol + 51.99 g/mol + 64.00 g/mol

Molar mass ≈ 140.30 g/mol

for more such questions on mass

https://brainly.com/question/24191825

#SPJ8

Answer:

It's actually perfect just the way it is.

Explanation:

Here is the full map of the ABC's: ABCDEFGHIJKLMNOPQRSTUVWXYZ

Hope this helped ♡

Answer:

The answer is (e) none of the above. The combined gas law relates the pressure, volume, and temperature of a gas, so all three variables (pressure, volume, and temperature) must be considered and at least one of them should be held constant to use the combined gas law. The mass of the gas sample, number of moles of gas, and number of gas molecules are not directly related to the combined gas law.

Answer:

The reaction of silver with hydrochloric acid has no result, as this metal does not dissolve in hydrochloric acid because it is covered with a thin layer of silverchloride. If you add free oxygen to the solution in the form of hydrogen peroxide, the reaction leads to the oxidation of silver to silver chloride.

The ph value of human saliva is between 6.2-7.6 with 6.7 being the average pH

ph value of human saliva is 7 and 6

Answer:

whats CH3COOH please tell me so I can answer!

The statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected. That is option B.

Photoelectric effect is defined as the process by which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.

The photoelectric effect can also be defined as the ejection of electrons from a metal plate when light falls on it.

Therefore, statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected.

Learn more about electrons here:

https://brainly.com/question/25674345

#SPJ1

Taking into account the reaction stoichiometry, 103.5 grams of Na⁺ is required to react with 4.5 moles of chloride.

In first place, the balanced reaction is:

Na⁺ + Cl⁻  → NaCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 1 mole of Cl⁻ react with 23 grams of Na⁺, 4.5 moles of Cl⁻ react with how many moles of Na⁺?

mass of Na⁺= (4.5 moles of Cl⁻×23 grams of Na⁺)÷ 1 moles of Cl⁻

mass of Na⁺= 103.5 grams

Finally, 103.5 grams of Na⁺ is required.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

#SPJ1

Answer:

it's true I think I don't know perfectly whether it is correct answer or not

Answer:

Dude this one is confusing because you are not giving the price of the object.

Explanation:

The molecular formula for a molecular compound's molecular formula lists the variety of atoms that make up the molecule. The name of the compound (Co(ClO₃)₄(NO₂))Cl is tetrachloridobis(nitrito-O)cobalt(III) chloride.

The name or the formula of the following compounds are:

The name of the compound (Co(ClO₃)₄(NO₂))Cl is tetrachloridobis(nitrito-O)cobalt(III) chloride.

The name of the compound K(Co(SO₄)(NH₂CH₂CH₂NH₂)₂(CN)) is potassium bis(ethylenediamine)dihydroxidocyanidocobaltate(III) sulfate.

The formula of the compound sodium carbonyldiisothriocyanatotrinitritochromate(III) is Na[Cr(NCS)₂(NO₂)₃(CO)].

The formula of the compound amminediaquatrihydroxidochromium(VI) nitrate is [Cr(OH)₄(NH₃)₂(H₂O)₂]NO₃.

Learn more about formula, here:

https://brainly.com/question/30062954

#SPJ1

Answer: 13.5 minutes to run 3.2 km.

Explanation: To solve this problem, you need to convert the distance from kilometers to miles and the speed from miles per hour to kilometers per hour. 3.2 km is approximately 1.988 miles and 5.5 mph is approximately 8.851 kph. To find the time it takes to run 1.988 miles at 8.851 kph, you can use the formula time = distance ÷ speed. Plugging in the values, you get time = 1.988 miles ÷ 8.851 kph, which simplifies to approximately 0.225 hours or 13.5 minutes.

Therefore, it will take the student approximately 13.5 minutes to run 3.2 km.

Answer:

Explanation: The aldehydes in which the aldehydic functional group (−CHO) is attached to a saturated carbon chain are called Aliphatic aldehydes.

The endothermic reaction PE diagram is characterized by higher energy products and lower energy reactants.

The Potential Energy (PE) diagram represents the potential energy of the reactants and products. The change in potential energy during a reaction is often an indicator of whether the reaction is endothermic or exothermic.Endothermic reactions are those that absorb energy from their surroundings, while exothermic reactions release energy into their surroundings. The potential energy diagram for an endothermic reaction is characterized by a higher energy of products than that of the reactants.In other words, the energy required to break the bonds in the reactants is less than the energy required to form bonds in the products. The reactants are at a lower energy level than the products on the potential energy curve. The graph of PE diagram for an endothermic reaction is as follows: Image depicting a PE diagram for an endothermic reaction. As a result, Option B represents a PE Diagram for an endothermic reaction.

for such more questions on reaction

https://brainly.com/question/11231920

#SPJ8

Explanation:

It is claimed that the increases in crop productivity brought about by genetic engineering can help relieve problems faced by farmers by decreasing the losses caused by pests, disease, weeds, and other stressors (Guerinot 2000).

Scientific research in the 1800s revealed that the rate of infection in surgery patients drastically decreased when antiseptics were used to clean wounds before procedures. It benefited society because it improved humans' understanding of

how infections spread.

In our day to day life, various different types and unknown diseases we are facing. This can be due to change in our activities or by using harmful chemicals in industries or may be due to experimental activities in laboratory.

If we use antiseptic before the procedures to clean wounds, it kill the bacteria and other virus and make it clean. This protect us from the upcoming harmful effects of uncleaned wounds.

So, it make us a step towards the healthy and wealthy life.

Thus, we concluded that using antiseptics to clean wounds before procedures. It benefited society because it improved humans' understanding of

how infections spread.

learn more about antiseptic:

https://brainly.com/question/13242539

#SPJ13

Answer: 6.23

Explanation:

1) solve for pH  

pH=-log (H3O+) = - log 1.7 X 10^-8 =7.77

2) now do 14-pH  = 14 -7.77=6.23

Answer:

\(1s^{2}2s^{2} 2p^{6}3sx^{2}3p^{6} 4s^{2}\)  [full configuration]

Explanation:

Calcium has 20 electrons in its nucleus, and by virtue of its position on the periodic table (fourth row, second column), it is an s-block element with its entire lower orbital filled. it has two valence electrons.

Therefore, its configuration is:

\(1s^{2}2s^{2} 2p^{6}3sx^{2}3p^{6} 4s^{2}\)

To condense this, you can utilize Argon's stable configuration before \(4s^{2}\) to show that all orbitals before 4s are filled.

I hope this was helpful.

While a dipeptide has two amino acids, a polypeptide has many. many chemical reactions, called dehydration synthesis reactions, occur by removing water. The central part of an atom is called the nucleus.

Nonpolar covalent compounds do not dissolve in water, meaning they are hydrophobic. Ionic compounds readily dissolve in water, meaning they are hydrophilic.

Hydrophilic materials draw or absorb water, whereas hydrophobic materials resist it. The chemical composition and surface roughness, among other things, affect a material's hydrophobic or hydrophilic properties. Hydrophobic materials include things like magic sand, lotus leaves, and nano-tex fabric.

to know more about hydrophilic visit

https://brainly.com/question/30074618

#SPJ4

Answer:

317.6 mL

Explanation:

Step 1: Write the balanced neutralization equation

MgO + 2 HCl ⇒ MgCl₂ + H₂O

Step 2: Calculate the mass corresponding to 640.0 mg of MgO

The molar mass of MgO is 40.30 g/mol. The moles corresponding to 640.0 mg (0.6400 g) of MgO are:

0.6400 g × (1 mol/40.30 g) = 0.01588 mol

Step 3: Calculate the moles of HCl that react with 0.01588 moles of MgO

The molar ratio of MgO to HCl is 1:2. The moles of HCl are 2/1 × 0.01588 mol = 0.03176 mol

Step 4: Calculate the volume of 0.1000 M HCl that contains 0.03176 moles

0.03176 mol × (1 L/0.1000 mol) = 0.3176 L = 317.6 mL

Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.