A student sets up the following equation to solve a problem in solution stoichiometry. (The ? stands for a number the student is going to calculate.) Enter the units of the student's answer

(1.26mol)1mL10^−3L / (7.9mol/L)= ?

Answer:

Surface weathering, I believe

Explanation:

Answer

(D)

Explanation

In the energy profile diagram, the difference in the potential energy between reactant and product is called enthalpy Change (ΔH).

Mathematically, Enthalpy Change (ΔH) = Heat of the product (Hₚ) – Heat of reactant (Hᵣ).

That is, ΔH = Hₚ – Hᵣ

Considering the diagram given in the question, the difference between the potential energy of the products and the potential energy of the reactants is indicated by the letter (D).

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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Answer:

Boron

The Boron Family is named after the first element in the family. Atoms in this family have 3 valence electrons. This family includes a metalloid (boron), and the rest are metals.

Explanation:

Periodic table block Periodic table group Valence electrons

d Groups 3-12 (transition metals) 3–12

p Group 13 (III) (boron group) 3

Group 14 (IV) (carbon group) 4

Group 15 (V) (pnictogens or nitrogen group)

The Independent variable  in the experiment is the type of covering material.

An experiment is the only way by which we are able to decode cause and effect relationships. Since science is empirical, every tentative explanation if a phenomenon is subjected to controlled tests. These controlled tests are what we call an experiment. There must be an independent variable and there must be  dependent variable. The independent variable is the variable that is manipulated in the experiment while the dependent variable is the variable that changes as we manipulate the independendent variable.

Now, if we look at the experiment, we can see that we are manipulating the type of covering in order to determine the impact that it has on the time that it taking for cooling to occur.

Hence the Independent variable  in the experiment is the type of covering material. The type of the covering was being changed and then the impact of the change of the covering material on the cooling time is studied.

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Answer:

Explanation:

To determine the mass of NaCl in 1.25L of 0.1035M solution, we can use the formula:

mass = concentration x volume x molar mass

where concentration is in molarity (M), volume is in liters (L), and molar mass is in grams per mole (g/mol).

The molar mass of NaCl is 58.44 g/mol.

Plugging in the given values, we get:

mass = (0.1035 M) x (1.25 L) x (58.44 g/mol)

mass = 7.3188 g

So, there is approximately 7.3188 grams of NaCl in 1.25L of 0.1035M solution.

When cyclohexene is mixed with a sulfonitric mixture (H2SO4/HNO3), it reacts to form nitrocyclohexane and sulfur dioxide.

This reaction proceeds in two steps. Firstly, cyclohexene undergoes electrophilic addition with the nitronium ion (NO2+), which is generated from the reaction between HNO3 and H2SO4. This results in the formation of nitrocyclohexane, giving the initial pale yellow color to the solution.

In the second step, nitrocyclohexane reacts with the excess sulfuric acid present in the mixture. This step is highly exothermic, releasing a significant amount of energy. The sudden release of energy causes an explosion. The exact mechanism of the explosive reaction is complex, involving the generation of reactive intermediates. It is believed that the reaction proceeds via a radical mechanism, where nitrocyclohexane decomposes into highly reactive nitrogen and carbon-centered radicals. These radicals further react with sulfur dioxide, which is produced in the reaction, to form stable compounds. As a result, the solution turns dark brown after the explosion.

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Answer:

covalent bond

Explanation:

Answer:

ang hirap na nag tanung

a)Atomic number is the number of protons in the nucleus of an atom.

b)atomic number represents the number of protons

An element's identity is defined by its atomic number; this means it represents the number of protons in its nucleus.

The question is incomplete, the complete question is;

Which of the following best describes an atomic number? An element's identity is defined by its atomic number; this means it represents the number of

A) protons plus neutrons in its nucleus.

B) electrons in the element.

C) protons in its nucleus.

D) neutrons in its nucleus.

The subatomic particles in the atom are;

Neutrons and protons are contained in the nucleus hence they are collectively called nucleons.

Electrons are found in the orbits. The number of protons must be equal to the number of electrons for the atom to be electrically neutral.

The number of protons in an atom or atomic number serve as a means of identifying an atom.

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Answer:

float

Explanation:

it floats

(a) Van der Waal's forces. Van der Waal's forces are weak electrostatic interactions between non-polar molecules.

These weak forces arise from the fluctuating dipoles within the molecules, which cause temporary charges to develop and attract each other. This attraction leads to the formation of weak intermolecular bonds, which are mainly responsible for the attraction between non-polar molecules. These forces are weak in comparison to other intermolecular forces, such as hydrogen bonding and ionic bonds, but are still important for the stability of non-polar molecules and their ability to dissolve in other non-polar solvents.Van der Waals forces are attractive intermolecular forces between molecules caused by the fluctuating dipole moments of molecules.

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complete question:The attraction that non-polar molecules have for each other is primarily caused by —

(a) Van der Waal's forces (b) Difference in electronegativities

(c) Hydrogen bonding (d) High ionisation energy​

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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After 1.5 days, only 1.25 mg of technetium-99m will remain out of the original 80 mg that was prepared.

Technetium-99m (99mTc) is a radioactive isotope that is used in medical imaging.

It has a half-life of 6 hours, which means that after 6 hours, half of the original amount of technetium-99m will have decayed.

Therefore, after another 6 hours (12 hours total), half of the remaining technetium-99m will have decayed, leaving only 25% of the original amount.

After another 6 hours (18 hours total), half of the remaining technetium-99m will have decayed again, leaving only 12.5% of the original amount.

After 1.5 days, which is 36 hours total, we can use the formula for radioactive decay to calculate how much technetium-99m will remain: amount remaining = original amount x \((1/2)^{t/h}\) where t is the time elapsed and h is the half-life.

Plugging in the given values, we get: amount remaining = 80 mg x (1/2)^(36/6) amount remaining = 80 mg x \((1/2)^{6}\) amount remaining = 80 mg x 0.015625 amount remaining = 1.25 mg

Therefore, after 1.5 days, only 1.25 mg of technetium-99m will remain out of the original 80 mg that was prepared.

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You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

The sand and water end up at the same temperature. The sand consists of material that all has the same specific heat. The relations between temperature change and heat lost by the water and gained by the sand can be written separately as: (1) where and are the specific heats of water and sand, respectively. By assumption, the heat gained

Explanation:

Answer:

Please, look at the given image for the answer.

Answer:

the Ans is 2

Explanation:

marks as BRAINLY

In calcium hydroxide, there are total 6 atoms are present. 2 calcium atoms, 2 oxygen atoms and 2 hydrogen atoms are present in calcium hydroxide molecule.

An inorganic substance having the chemical formula Ca(OH)2 is calcium hydroxide. It is created when quicklime is combined or slaked with water and is a colorless crystal or white powder. It goes by a variety of names, including pickled lime, hydrated lime, caustic lime, builders' lime, and slaked lime.

A white powder without any smell is calcium hydroxide. It is applied in commercial contexts such sewage treatment, paper manufacturing, building, and food processing. It can be used in dentistry and medicine. In root canal fillings, for instance, calcium hydroxide is frequently used.

Calcium oxide is converted to calcium hydroxide, sometimes known as slaked lime, or Ca(OH)2. A little percentage of it dissolves when combined with water, creating a substance known as lime water.

Thus, In calcium hydroxide, there are total 6 atoms are present.

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Initial solution concentration of the original sulfuric acid solution is 1.66.

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Answer:

9.6 mol

Explanation:

Start by writing out the balanced equation of the reaction.

2\(H_{2}\) + \(O_{2}\) ⇒ 2\(H_{2}O\)

Here you will see 2 mol of hydrogen for every 1 mol of oxygen. Using this ratio, you can assume the amount of hydrogen will always be double that of oxygen. In this case, 4.8 * 2 = 9.6

Answer: 381.92

Explanation:

Fill to the 250-mL mark with water after mixing a tiny amount of water with the solute to dissolve it.

answer: A not sure but i hope it helps :) success

Answer:

0.1334

Explanation:

The number of atoms per unit (n) is given by:

\(n=\frac{\rho a^2bN_a}{A} \\\\where\ a=5.83*10^{-8}cm,b=a=3.18*10^{-8}cm,\rho=7.3\ g/cm^3,\\N_a=Avogadro\ number=6/022*10^{23} mol^{-1},A=atomic\ weight\\=118.68 \ g/mol\\\\n=\frac{7.3* (5.83*10^{-8})^2*(3.18*10^{-8})*6.02*10^{23}}{118.69}\\\\n=4\ atoms/unit\)

The atomic packing factor (APF) is:

\(APF=\frac{n(\frac{4\pi R^3}{3} )}{a^2b} \\\\But\ R=atomic\ radius=1.51*10^{-8}\ cm\\\\APF=\frac{4(\frac{4\pi (1.51*10^{-8})^3}{3} )}{(5.83*10^{-8})^2*3.18*10^{-8}}\\\\APF=0.1334\)

Answer:

142.36 kg

Explanation:

volume of water in the lake = surface area x depth

= 18.5 x ( 1760 x 3 )² x 39 ft³

= 2.011 x 10¹⁰ ft³

= 2.011 x 10¹⁰ x 28.3168 liter .

= 56.945 x 10¹⁰ liter .

concentration of mercury = .25 x 10⁻⁶ g / liter

= 25 x 10⁻⁸ g / liter

= 25 x 10⁻¹¹ kg / liter

mass of mercury in the water of lake

= 25 x 10⁻¹¹ x 56.945 x 10¹⁰ kg

= 142.36 kg .

Answer:

\(V=100mL\)

Explanation:

Hello.

In this case, since the chemical reaction is:

\(Na_2CO_3+CaCl_2\rightarrow CaCO_3+2NaCl\)

We next compute the moles of sodium carbonate from the 2.00 grams of calcium carbonate via their 1:1 mole ratio in the chemical reaction:

\(n_{Na_2CO_3}=2.00gCaCO_3*\frac{1molCaCO_3}{100.09gCaCO_3}*\frac{1molNa_2CO_3}{1molCaCO_3} \\\\n_{Na_2CO_3}=0.0200molNa_2CO_3\)

Thus, by knowing the molarity, we compute the volume:

\(M=\frac{n}{V}\\ \\V=\frac{n}{M}=\frac{0.0200mol}{0.200mol/L}\\ \\V=0.100L*\frac{1000mL}{1L}\\ \\V=100mL\)

Best regards.

The volume in mL of 0.200 M Na₂CO₃ needed to produce 2.00 g of CaCO₃ there is an excess of CaCl₂ is 100mL.

Molarity is define as no. of moles of solute present in per liter of solvent or solution.

Given chemical reaction is:
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl

From the stoichiometry of the reaction it is clear that:
1 mole of CaCO₃ = produced by 1 mole of Na₂CO₃

Moles of CaCO₃ will be calculated as:

n = W/M, where

W = given mass = 2g

M = molar mass = 100.09g/mole

n = 2/100.09 = 0.0200 moles

0.0200 mole of CaCO₃ = produced by 0.0200 moles of Na₂CO₃

Now we calculate the volume by using molarity as:

V = n/M

V = 0.0200/0.2 = 0.1L = 100mL

Hence, the required volume is 100mL.

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