uppose you are standardizing a sodium hydroxide solution with K H P (molar mass=204.2 g/mol) according to the equation K H P + N a O H ⟶ H 2 O + N a K P You prepare the standard solution from 0.294 g of K H P in 250.0 mL of water. You then require 7.42 mL of N a O H solution to complete the titration. What is the concentration of the N a O H solution?

Answer:

925kcal, 3870.2kJ.

Explanation:

The calorie densities of these energy sources are:

Carbohydrates: 4kcal/g

Fat: 9kcal/g

Protein: 4kcal/g

70.0g of carbohydrates are:70.0g * (4kcal/g) = 280kcal

5.0g fat * (9kcal/g) = 45kcal

150g protein * (4kcal/g) = 600kcal

The energy in kilocalories is 600+280+45 = 925kcal

As 1kcal is 4.184kJ. 925kcal are:

925kcal * (4.184kJ/1kcal) = 3870.2kJ

The number of atoms present in 591 g of gold is 1.81×10²⁴ atoms

From Avogadro's hypothesis,

1 mole of Gold = 6.02×10²³ atoms

But

1 mole of gold = 197 g

Thus,

197 g of gold = 6.02×10²³ atoms

197 g of gold = 6.02×10²³ atoms

Therefore,

591 g of gold = (591 × 6.02×10²³) / 197

591 g of gold = 1.81×10²⁴ atoms

Thus, 1.81×10²⁴ atoms is present in 591 g of gold.

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In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺.

Photophosphorylation is the conversion of ADP to ATP by using the sunlight. the water molecules is split into the hydrogen and the oxygen this whole process is known as photolysis. In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺ known as hill reaction. The process of cooperative production of energy is called as non cyclic photophosphorylation. The proton produces by the splitting of water molecule is combine with electron reduces the NDAP to NDAPH₂.

Thus, In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺.

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Answer: D.

Explanation: :)

Answer:

d

Explanation:

Answer:

Shearing -> Skirting & Grading -> Sorting -> Cleaning & Scouring -> Drying -> Baling for shipment

Explanation:

Answer:

Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it.

Answer:

In order for that element to gain stability

Answer:

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Explanation:

Answer:

Atomic Radii

Have a great day!

Answer:

This is an element, I believe ! (Correct me if I'm wrong)

Answer:

c i think

Explanation:

We can actually deduce here that the purpose of this assignment is to teach students about decomposition reactions and allow them to determine the percent yield.

By performing the experiment, students will gain a better understanding of the concepts involved and how they relate to their overall learning.

The specific focus of this assignment is the decomposition of sodium bicarbonate (NaHCO3) to produce sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2). The unbalanced chemical equation for this reaction is:

NaHCO3 (s) + heat -> Na2CO3 (s) + H2O (g) + CO2 (g)

To understanding the reaction itself, students will also learn about the concept of percent yield. Percent yield is a measure of the efficiency of a chemical reaction and is calculated by dividing the actual yield of the desired product by the theoretical yield, then multiplying by 100.

This calculation allows students to assess how well the reaction proceeds in terms of producing the expected amount of sodium carbonate.

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Answer:

X(HCO3)2 is X2(C2H2O6), so the total number of atoms for each element can be calculated:

2 X atoms

4 H atoms

6 C atoms

12 O atoms

Calculate the total atomic mass of the elements:

2 X atoms * atomic mass of X = 2X * atomic mass of X

4 H atoms * 1.0 amu = 4.0 amu

6 C atoms * 12.0 amu = 72.0 amu

12 O atoms * 16.0 amu = 192.0 amu

The molar mass of X(HCO3)2 is 162 g/mol, so the total atomic mass of the elements should add up to 162 g/mol:

2X * atomic mass of X + 4.0 amu + 72.0 amu + 192.0 amu = 162 g/mol

Solve for X by rearranging the equation:

2X * atomic mass of X = 162 g/mol - 4.0 amu - 72.0 amu - 192.0 amu = -12.0 amu

2X = -12.0 amu / atomic mass of X

Divide both sides by 2:

X = -6.0 amu / atomic mass of X

So the relative atomic mass of X is 6.0 amu.

The balanced chemical equation for the reaction of magnesium with oxygen is:

2 Mg + O2 -> 2 MgO

From the equation, we see that 2 moles of Mg produces 2 moles of MgO. So, 1 mole of Mg will produce 1 mole of MgO.

Given that 2.00 moles of Mg are reacting, we can find the number of moles of MgO produced:

2.00 mol Mg * (1 mol MgO / 1 mol Mg) = 2.00 mol MgO

Now, we can use the molar mass of MgO to convert moles to grams:

2.00 mol MgO * 40.31 g/mol MgO = 80.6 g MgO

Therefore, 80.6 grams of magnesium oxide is produced from 2.00 moles of magnesium.

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Answer: I, II, V

Explanation:

The precipitate formed when a solution of manganese(II) nitrate and

potassium sulfide react is Manganese sulfide (MnS)

To obtain the precipitate formed when a solution of manganese(II) nitrate and potassium sulfide react, we shall write the balanced ionic equation. This is illustrated below:

Manganese (II) nitrate => Mn(NO₃)₂

Potassium sulfide => K₂S

In solution, they will react as follow:

Mn(NO₃)₂ (aq) —> Mn²⁺(aq) + 2NO₃¯(aq)

K₂S(aq) —> 2K⁺(aq) + S²¯(aq)

Mn(NO₃)₂ (aq)  + K₂S(aq) —>  

Mn²⁺(aq) + 2NO₃¯(aq) + 2K⁺(aq) + S²¯(aq) —> MnS(s) + 2K⁺(aq) + 2NO₃¯(aq)

Cancel out the spectator ions (i.e K⁺ and NO₃¯)

Mn²⁺(aq) + S²¯(aq) —> MnS(s)

From the net ionic equation above, we can see that MnS is insoluble.

Therefore, the precipitate formed when a solution of manganese(II) nitrate and potassium sulfide react is Manganese sulfide (MnS)

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Answer:        HHHHHHHHHHHHHHHHHHHHHHAHAHHAHAHHAHHAHHAHHAHHAHAHAHHHAHAHAHHAHAHHA

DON"T KNOW?

Explanation:

Answer:

I would choose E

Explanation:

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products

web-

Answer:

4.687 mols of sodium hydroxide (btw mols in chemistry do not have an e in it)

Explanation:

You need to divide the number of grams of sodium hydroxide by sodium hydroxide's molecular mass, which is 39.997 grams per mol.

The combustion of lauric acid is shown as CH3(CH2)10COOH(s) + 18O2(g) -----> 12H20(l) + 12CO2(g)

In a combustion reaction, a substance is burnt in oxygen. If the substance is an organic compound a the case is here, the products are carbon dioxide and hydrogen.

No the equation of the combustion of lauric acid is shown as;

CH3(CH2)10COOH(s) + 18O2(g) -----> 12H20(l) + 12CO2(g)

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Explanation:

Adding logs of same base is equivalent to multiplying the arguments. You get:

\( log_{3}(35x) = 4\)

Use the definition of the log to turn this into an exponential function:

\( {3}^{4} = 35x\)

\(81 = 35x\)

\(x = \frac{81}{35} \)

The mass of is K2CrO7 in the 250 ml of solution is mathematically given as

x=1.25mg of K2CrO7.

Hence, 250 ml of the solution will contain 1.25mg of K2CrO7

Question Parameters:

The total of potassium dichromate are there in a 250 mL bottle filled with 5 ppm solution

Generally the mass of k2CrO7  is mathematically given as

\(x=\frac{5mg of k2CrO7  *250ml of solution}{1000ml of solution}\)

x=1.25mg of K2CrO7

Therefore,

250 ml of the solution will contain 1.25mg of K2CrO7

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U.S. Census Bureau changed the way it records information about relationships by increasing the number of relationship categories to include same-sex partner options and is denoted as option B.

This is a close connection between people and is characterized by physical or emotional intimacy.

There has been changes in the way U.S. Census Bureau records information is recorded in this aspect by  increasing the number of relationship categories for inclusiveness of other types of people such as those who have same-sex partners and so on.

This is therefore the reason why option B was chosen as the correct choice.

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The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

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Answer:

1) As the temperature increased what happened to the N2O4 concentration, it decreased

2) Formation of products, products are the right hand side of the equation.

3) Right to left is exothermic

4) Change in enthalpy N2O4 ⇔2NO2, HR = -14 kcal

As it's an exothermic reaction, the enthalpy of the reactants is higher than the products and the sign of the HR will be negative.

Explanation:

N2O4 ⇔2NO2

(colorless) (reddish-brown)

1) As the temperature increased what happened to the N2O4 concentration, it decreased

2) Formation of products, products are the right hand side of the equation.

3) Right to left is exothermic

4) Change in enthalpy N2O4 ⇔2NO2, HR = -14 kcal

As it's an exothermic reaction, the enthalpy of the reactants is higher than the products and the sign of the HR will be negative.

Answer:

[C₆H₅NH₃⁺] = 0.0399 M

Explanation:

This excersise can be easily solved by the Henderson Hasselbach equation

C₆H₅NH₃Cl → C₆H₅NH₃⁺  + Cl⁻

pOH = pKb + log (salt/base)

As we have value of pH, we need to determine the pOH

14 - pH = pOH

pOH = 8.43  (14 - 5.57)

Now we replace data:

pOH = pKb + log ( C₆H₅NH₃⁺/  C₆H₅NH₂ )

8.43 = 9.13 + log (  C₆H₅NH₃⁺ / 0.2 )

-0.7 = log (  C₆H₅NH₃⁺ / 0.2 )

10⁻⁰'⁷ = C₆H₅NH₃⁺ / 0.2

0.19952 = C₆H₅NH₃⁺ / 0.2

C₆H₅NH₃⁺ = 0.19952 . 0.2  = 0.0399 M

Answer:

enzymes

Explanation:

sorry if I am wrong, have a nice day/night

Answer:

amino acids - enzyme is a protein that can control the rate of biochemical reactions

The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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The appropriate items to their respective bins are:

Covalent: Carbon dioxide

Ionic: Table salt

Metallic: Iron

Molecular: Sugar

What is bins?

Bins are containers used for storing and organizing items. They can be made from a variety of materials, including wood, metal, and plastic, and come in many shapes and sizes. Bins are often used in large warehouses, retail stores, and other business establishments to store and organize products, tools, and other items. In the home, bins can be used to store toys, shoes, and other items that need to be kept organized.

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ANSWER

Sn-120

EXPLANATION

Sn has naturally occurring isotopes which Sn- 120 is the most abundant

The natural abundance of Sn-120 is 32.58%

Therefore, Sn-120 is the most abundant isotope of Sn