Given that AG for the reaction below is -957.9 kJ, what is AG, of H₂O?
AGI,NH3-16.66 kJ/mol
AGINO 86.71 kJ/mol
= =
O-228.6 kJ/mol
O-206.4 kJ/mol
O 46.7 kJ/mol
O 90.7 kJ/mol
4NH3(g) +50₂(g) → 4NO(g) + 6H₂O(g)

Cold water has a very modest interaction with very clean magnesium ribbon. Hydrogen bubbles start to appear on its surface after a while.

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If the reaction were performed and actually produced 10.86 g of H₂O, the percent yield would be 52.54%.

The percent yield of a reaction is the ratio of the actual yield of a reaction and the theoretical or expected yield of a reaction as obtained from the equation of the reaction expressed as a percentage.

Mathematically:

The theoretical yield of the reaction from the equation of the reaction given below is 20.67 g

Equation of reaction:

Ca(OH)₂ ---> CaO + H₂O

Percent yield = 10.86/20.67 * 100%

Percent yield = 52.54%

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Complete question:

If 85.0 grams of Ca(OH)2 are used in this reaction, how many grams of water would be produced?

If you were to perform this reaction and actually produced 10.86 g of H2O, what would be your percent yield? (Your theoretical/expected yield is the amount produced from your limiting reactant.)

a beaker contains 145.675 ml of a saline solution. if 24.2 ml of the saline solution are removed from the beaker, The volume of solution remains is 121.5 ml.

Water and sodium chloride are combined to make saline. It can be used in medicine for a variety of purposes, such as cleaning wounds, removing and storing contact lenses, and treating dry eyes. As the saline solution is liquid. and no other solvents is added.The value of the solution remaining in the beaker can be calculate by simply substrating removed solution value from initial value

volume withdrawn from the flask substrate by total volume

= 145.675 ml - 24. 2 ml

= 121.475 ml

= 121.5 ml

So, the solution in the beaker is 121.5 ml

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The volume of the solution remained in the beaker after removing 24.2 ml of the saline solution is 121.5 ml.

A Saline solution is said to be a mixture of sodium chloride and water. This solution has a number of uses in medicine including cleaning wounds, removal and storage of contact lenses and help with dry eyes. It is used to treat dehydration by injecting the solution through vein.

A beaker contains 145.675 ml of a saline solution. if 24.2 ml of the saline solution are removed from the beaker. To find the remaining solution in the beaker we have to substract the total solution that was present in the beaker with the amount of the solution that is removed from the beaker.

 Remaining volume of the solution = 145.675 ml  - 24.2 ml

                                    = 121.5 ml

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The empirical formula of the compound is B₃H₅

According to the law of conservation of mass, "matter in a closed system is neither created nor destroyed by physical transformations or chemical reactions but changes from one form to the other"

This implies that, sum of masses of the reactants = sum of masses of the product

Therefore, according to the question:

10g of Boron + x grams of Hydrogen = 11.55g of the product

∴ Mass of hydrogen = 11.55 - 10.00 = 1.55g

We know that,

Molar mass of Boron = 10.811g

Molar mass of Hydrogen = 1.00784g

Number of moles of Boron

= (mass of Boron)/(molar mass of Boron)

= 10/10.811

= 0.9249 mol

Number of moles of Hydrogen

= (mass of Hydrogen)/(molar mass of Hydrogen)

= 1.55/1.00784

=1.5379mols

Thus, 0.9249 mole of Boron will combine with 1.5379mole of Hydrogen

Now, by dividing both sides of the mole by 0.9249, we get

1 mole of Boron combines with 1.66266 mole of Hydrogen

converting 1.66266 in fractions is approximately 5/3

which implies, 1 mole of Boron combines with 5/3 moles of Hydrogen

Now, by multiplying both sides by 3 we get

3 moles of Boron will combine with 5 moles of Hydrogen

∴ Empirical formula of the compound is B₃H₅

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a. Silver coin - Element (Silver is a pure element and is not chemically combined with any other element in a silver coin)

b. Air - Mixture (Air is a mixture of gases, primarily nitrogen and oxygen, with trace amounts of other gases and particles)

c. Coffee - Mixture (Coffee is a mixture of various compounds such as water, caffeine, and organic compounds that give it its flavour and aroma)

d. Soil - Mixture (Soil is a mixture of various substances such as minerals, organic matter, water, and air)

My everyday experiences influenced my response because I have come across these examples in my daily life and have been taught about them in science classes. For example, I know that air is composed of different gases and particles, and that soil is made up of a mixture of substances, including minerals and organic matter. Similarly, I know that a silver coin is made of pure silver and that coffee is made of various compounds.

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All of the above forces (ionic interactions, H-bonding, van der Waals forces, metal ions, and disulfide bonds) play a role in stabilizing the 3-dimensional structure of proteins. Thus, the correct answer is Choice 6 of 6: all of the above.

Ionic interactions occur between positively and negatively charged amino acid residues, which helps to maintain the overall charge balance of the protein. H-bonding involves the sharing of electrons between atoms, and helps to hold the protein's secondary and tertiary structures in place. Van der Waals forces are relatively weak interactions between atoms, but they can contribute to the stability of the protein by helping to hold the atoms in place. Metal ions can also play a role in stabilizing the protein by binding to specific amino acid residues. Disulfide bonds form between cysteine residues and help to hold the protein's tertiary structure in place.

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To precipitate 16.0 g of AgBr from a solution containing 0.420 mol of Ag, 0.143 L of a solution containing 0.200 M KBr is required.

"The amount of space an object or substance occupies" is the definition of volume, which is a scalar quantity. It is a measurement of an object's or substance's three-dimensional extent and is typically expressed in length-cubed units like cubic meters (m3), liters (L), or cubic centimeters (cm3).

                     AgNO3 + KBr = AgBr + KNO3

                                      mass = moles x molar mass

                                           = 0.420 mol x 247.8 g/mol

                                                    = 104 g

                            V = m / M x n  

                               = 16 / (0.200 x 0.420)

                                 = 0.143 L.

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Answer:

Explanation:

C - Mix ice with water until equilibrium is reached but some ice remains that is no longer melting.

The solution is excess hydrogen ions and a low ph.

It probably has a low pH and too many hydrogen ions. Acid mine drainage (AMD), which lowers the pH of water resources and makes dissolved metals easily available for uptake by benthic animals and fish, is a significant contributor to the entry of these contaminants into the human food chain. The term "acid mine drainage" refers to the runoff that results from water coming into touch with exposed sulfur-bearing minerals. These minerals react with the water and air to produce sulfuric acid and dissolved iron. Heavy metals like copper, lead, and mercury are dissolved by this acidic runoff, contaminating both groundwater and surface water. Mine drainage issues include tainted drinking water, hampered aquatic plant and animal development and reproduction, and the acid's corrosive effects on parts.

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The formula and the name for each of the four different molybdenum fluorides are :

1) Formula of the compound = MoF₃ = Molybdenum trifluoride

2. Formula of the compound = MoF₄ =  Molybdenum tetrafluoride

3. Formula of the compound = MoF₅ = Molybdenum pentafluoride  

4. Formula of the compound = MoF₆ =  Molybdenum hexafluoride  

1) Molybdenum (Mo) = 63.0%

Fluorine (F) = 100 – 63 = 37%

Moles, Mo = 63.0 / 96 = 0.656

Moles, F = 37 / 19 = 1.947

Divide by the smallest

Mo = 0.656 / 0.656 = 1

F = 1.947 / 0.656 = 3

The formula is MoF₃ = Molybdenum trifluoride

2) Molybdenum (Mo) = 56.0%,

Fluorine (F) = 100 – 56 = 44%

Moles are :

Mo = 56 / 96 = 0.583

F = 44 / 19 = 2.316

Divide by the smallest

Mo = 0.583 / 0.583 = 1

F = 2.316 / 0.583 = 4

The compound is MoF₄ = Molybdenum tetrafluoride

3) Molybdenum (Mo) = 50.0%,

Fluorine (F) = 100 – 50 = 50%

F = 50%

Mo = 50 / 96 = 0.520

F = 50 / 19 = 2.632

Divide by the smallest

Mo = 0.520 / 0.520 = 1

F = 2.632 / 0.520 = 5

The compound is  MoF₅ =  Molybdenum pentafluoride  

4) Mo = 46%

F = 54%

Mo = 46 / 96 = 0.479

F = 54 / 19 = 2.842

Divide by the smallest

Mo = 0.479 / 0.479 = 1

F = 2.842 / 0.479 = 6

Formula of compound = MoF₆ =  Molybdenum hexafluoride.

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Answer:

Below

Explanation:

1 meter = 100 cm

Volume =   100 cm * 100 cm * 2 cm = 20 000 cm^3  = 20 000 ml

mass = volume * density

         = 20 000 ml  *  1.42 g/ ml = 28400 g   ( or 28.4 kg)

As a scientist, I would recommend modifying the original Kool-Aid solution by reducing the amount of added sugar in the mix. The current recipe calls for 3 packs of Kool-Aid, each contains 6 grams of sugar.

To reduce the sugar content, we could reduce the number of packs of Kool-Aid used in the recipe or use a sugar-free or reduced-sugar version of the product. For example, if we used 1 pack of sugar-free Kool-Aid, the sugar content would be reduced to 0 grams. Or, if we used 2 packs of regular Kool-Aid, the sugar content would be reduced to 12 grams. Another option to consider would be to use a sugar substitute like Stevia or Erythritol which are low-calorie sweeteners and are safe for diabetics. It's also important to note that, as a scientist, it would be important to conduct taste tests with diabetic individuals to ensure that the modified recipe is still palatable and acceptable.

In summary, reducing the amount of sugar in the Kool-Aid mix or using a sugar substitute would be a way to modify the original Kool-Aid solution to better meet the needs of people with high diabetes.

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The increase in the diversity of species in an ecosystem  definitely lead to an increase in the productivity from that ecosystem. Hence, the statement is true.

An ecosystem is the regions in earth where  a group of living things and their essential non living things reside. There are various kind of ecosystems such as aquatic systems, forests, deserts etc.

The biodiversity refers to the diverse species of plants , animals and all other kind of livings there. By raising the possibility that species would use complementary resources and by increasing the likelihood that a highly productive or efficient species is present in the population, increasing species diversity can impact ecosystem functions, such as production.

For instance, greater use of soil resources can boost ecosystem production when there is a large diversity of plants. Similarly, when diverse plants populate more dependent animal variants survives more.

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Answer:

A. True

Explanation:

Got it right on Edge 2023.