How many moles of h2so4 are needed to neutralize 1.56 moles of koh?

Answer:

It is negative

Explanation:

There are 28.42 grams of Na2SO4 in 1.00 liter of a 0.200M solution by first finding the number of moles in one liter and then multiplying by the molar mass of Na2SO4.

To determine the mass of solute in 1.00 liter of a 0.200M Na2SO4 solution, we need to follow these steps:

Therefore, there are 28.42 grams of Na2SO4 in 1.00 liter of a 0.200M solution.

Final answer:

The maximum number of grams of silver phosphate that can be produced from 287g of silver chlorate and 52.8g of sodium phosphate is 134.78 grams, determined through stoichiometry and the identification of the limiting reactant.

Explanation:

To determine the maximum number of grams of silver phosphate that can be produced from the reaction of 287g of silver chlorate with 52.8g of sodium phosphate, we first need to calculate the moles of each reactant using their molar masses.

For silver chlorate, Ag(ClO3), its molar mass is approximately 235.77 g/mol. Therefore, 287g represents about 1.217 moles of Ag(ClO3).

For sodium phosphate, Na3PO4, its molar mass is approximately 163.94 g/mol. Therefore, 52.8g represents about 0.322 moles of Na3PO4.

According to the balanced chemical equation, 3 moles of Ag(ClO3) react with 1 mole of Na3PO4 to produce Ag3PO4. We can see that sodium phosphate is the limiting reactant because it will run out first. Using stoichiometry, 0.322 moles of Na3PO4 will produce an equal amount of moles of Ag3PO4.

To find out the mass of Ag3PO4 produced, we convert the moles back to grams using the molar mass of Ag3PO4 (418.58 g/mol). Hence, 0.322 moles of Ag3PO4 corresponds to approximately 134.78 grams of Ag3PO4.

This means the maximum mass of silver phosphate that can be produced from the given amounts of reactants is 134.78 grams.

Answer is:  2940 mL of the HCL solution.

c₁(HCl) = 10.0 M.

V₂(AgNO₃) = ?.
c₂(AgNO₃) = 0.85 M.
V₁(AgNO₃) = 250 mL ÷ 1000 mL/L = 0.25 L.

c₁ - original concentration of the solution, before it gets diluted.
c₂ - final concentration of the solution, after dilution.
V₁ - volume to be diluted.
V₂ - final volume after dilution.
c₁ · V₁ = c₂ · V₂.
V₂(HCl) = c₁ · V₁ ÷ c₂.

V₂(HCl) = 10 M · 0.25 L ÷ 0.85 M.

V₂(HCl) = 2.94 L · 1000 mL = 2940 mL.

Explanation:

Carbohydrates are the organic compounds that contain a carbon, hydrogen and oxygen atoms which are chemically combined together.

Their general formula is [tex](CH_{2}O)_{x}[/tex] where x is any integer.

For example, lactose has chemical formula [tex]C_{12}H_{22}O_{11}[/tex] and it is a carbohydrate.

A carbohydrate can be monosaccharide, disaccharide, oligosaccharide or polysaccharide.

Answer:

The correct answer is: C–H bonds in methane and O–O bonds in oxygen.

Explanation:

During the combustion of methane, methane react with oxygen molecule to give carbon dioxide and water molecule.

[tex]2CH_4+3O_2\rightarrow 2CO_2+2H_2O[/tex]

During the course of reaction :

During course of formation of products:

Final answer:

The Arrhenius definition of acid-base reactions states that an acid is a substance that dissociates in water to produce H+ ions, while a base is a substance that dissociates in water to produce OH- ions. Acid-base reactions involve the transfer of a proton from the acid to the base, resulting in the formation of water and a salt.

Explanation:

The Arrhenius definition of acid-base reactions states that an acid is a substance that dissociates in water to produce H+ ions, while a base is a substance that dissociates in water to produce OH- ions.

According to Arrhenius, an acid-base reaction involves the reaction of a proton (H+) from the acid with a hydroxide ion (OH-) from the base, resulting in the formation of water.

For example, in the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), HCl donates a proton (H+) to NaOH, which accepts the proton, forming water (H2O) and sodium chloride (NaCl) as a salt.

Strong electrolytes dissociate completely into ions in water. The resulting ions for CaCl2 are Ca2+ and Cl-; for Mg(NO3)2 are Mg2+ and NO3-; and for Al2(SO4)3 are Al3+ and SO4−2.

In water, strong electrolytes dissociate completely into their ions.

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To reduce the [Pb2+] to 1.0 × 10⁻⁶ M in a 1.00 liter solution of saturated PbF2, 26.45 grams of NaF should be added, as the Ksp for PbF2 is 4.0 × 10⁻⁸ at 25°C.

To determine how many moles of NaF must be added to a 1.00 liter solution of saturated PbF2 to reduce the [Pb2+] concentration to 1.0 × 10−6 M, we need to consider the Ksp of PbF2 and the common ion effect. The Ksp expression for PbF2 is Ksp = [Pb2+][F−]2, and the Ksp value given is 4.0 × 10−8 at 25°C. As we add NaF, which is a source of fluoride ions, F−, this will affect the equilibrium according to Le Chatelier's principle.

Since NaF fully dissociates in solution, each mole of NaF will provide one mole of F−. Our target is to maintain the [Pb2+] at 1.0 × 10−6 M while knowing the Ksp. From this, we can derive that:

[F−] = √(Ksp / [Pb2+]) = √(4.0 × 10⁻⁸ / 1.0 × 10⁻⁶ M) = √(4.0 × 10⁻² M) = 6.3 × 10⁻¹ M

Since the concentration of F− should be approximately 0.63 M to maintain the [Pb2+] at the desired level, and we want to achieve this in a 1-liter solution, we need to dissolve 0.63 moles of NaF:

0.63 moles × 41.99 g/mol = 26.45 grams of NaF.

This is the mass of NaF that should be dissolved to achieve the desired [Pb2+] in the solution.

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Methylamine is widely used in the making of pharmaceuticals, surfactants, and rubber chemicals. The lewis structure of methylamine determined the presence of lone pairs on nitrogen and have a trigonal pyramidal shape.

Methylamine is an organic molecule, in which one methyl group (CH3) and one amine group (NH3) are present.

The given below in the attachment is the lewis dot structure of methylamine.

The lewis dot structure is based on the Valence Shell Electron Pair Repulsion Theory (VSEPR). According to this theory:

Therefore, amine group will have trigonal pyramidal geomtery.

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The concentration of [tex]{\text{CaC}}{{\text{l}}_{\text{2}}}[/tex] is [tex]\boxed{6.88\;\%}[/tex] by mass.

Further Explanation:

The proportion of substance in the mixture is called concentration. The most commonly used concentration terms are as follows:

1. Molarity (M)

2. Molality (m)

3. Mole fraction (X)

4. Parts per million (ppm)

5. Mass percent ((w/w) %)

6. Volume percent ((v/v) %)

Mass percent:

It is the ratio of the mass of a component divided by the total mass of the solution, multiplied by 100.

The formula to calculate the mass percent of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] is as follows:

[tex]{\text{Mass}}\;{\text{percent of CaC}}{{\text{l}}_2} = \left( {\frac{{{\text{Mass of CaC}}{{\text{l}}_{\text{2}}}}}{{{\text{Mass of CaC}}{{\text{l}}_2}\;{\text{solution}}}}} \right)\left( {100} \right)[/tex]           …… (1)

The formula to calculate the mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] solution is as follows:

[tex]{\text{Mass of CaC}}{{\text{l}}_{\text{2}}}{\text{ solution}} = {\text{Mass of CaC}}{{\text{l}}_{\text{2}}} + {\text{Mass of water}}[/tex]       …… (2)

The mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] is 27.7 g.

The mass of water is 375 g.

Substitute these values in equation (2).

[tex]\begin{aligned}{\text{Mass of CaC}}{{\text{l}}_{\text{2}}}{\text{ solution}}&=27.7{\text{ g}}+{\text{375 g}}\\&={\text{402}}{\text{.7 g}}\\\end{aligned}[/tex]

The mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex] is 27.7 g.

The mass of [tex]{\text{CaC}}{{\text{l}}_2}[/tex]solution is 402.7 g.

Substitute these values in equation (1).

[tex]\begin{aligned}{\text{Mass}}\;{\text{percent of CaC}}{{\text{l}}_2}&=\left( {\frac{{{\text{27}}{\text{.7 g}}}}{{{\text{402}}{\text{.7 g}}}}} \right)\left( {100} \right)\\&=6.8785\;\%\\&\approx 6.8{\text{8 \% }}\\\end{aligend}[/tex]

Therefore the mass percent of [tex]{\mathbf{CaC}}{{\mathbf{l}}_{\mathbf{2}}}[/tex] is 6.88 %.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: mass percent, 6.88 %, mass of CaCl2, mass of water, mass of CaCl2, concentration, CaCl2, 27.7 g, 375 g, 402.7 g.

Final answer:

The concentration of CaCl2 in the solution is approximately 6.88% by mass.

Explanation:

The concentration of a solution is usually expressed as a percent by mass. In order to calculate this, we need to determine the mass of the solute (CaCl2) and the mass of the solution (cacl2 + water).

Given that 27.7g of CaCl2 is dissolved in 375g of water, the total mass of the solution would be 27.7g + 375g = 402.7g.

The concentration of CaCl2 is then calculated by dividing the mass of CaCl2 by the mass of the solution and multiplying by 100%: (27.7g / 402.7g) x 100% ≈ 6.88%.

An endothermic process is a chemical reaction or physical change that absorbs heat, with a positive change in enthalpy. An example is the reaction in a cold pack, where heat is absorbed, resulting in a sensation of cold. In contrast, an exothermic process releases heat, such as the combustion reaction in a Bunsen burner.

An endothermic process is a chemical reaction or physical change that absorbs heat from the surroundings. It is represented by a positive change in enthalpy, which is the sum of a system's internal energy and the mathematical product of its pressure and volume.

An example of an endothermic process is the reaction that occurs in a cold pack used to treat muscle strains. When the substances in the cold pack are brought together, heat is absorbed, resulting in a sensation of cold.

In contrast, an exothermic process releases heat. An example of an exothermic process is the combustion reaction that occurs when using a Bunsen burner. The heat given off during this reaction is equal to the enthalpy change of the methane combustion reaction.

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Answer:

Option B only

Explanation:

First to all, we have the same reaction in both equations, the difference between the two of them, is the fact one is Carbon in the form of graphite, and the other is carbon in the form of diamond.

Now, both reactions release energy in the form of heat, and it appears in the side of the products, this means that both reactions are exothermic (An exothermic reaction is when energy is released as product in the equation).

If energy is released in the reaction, (Which is enthalpy), this value is negative. As this value is negative, means that the internal energy of CO2 has to be lower than the energy of the reactants, so, option A can be discarted.

If we do E2 - E1:

-94.5 - (-94.05) = -0.45 kcal

Therefore, option B is correct.

As we can see the energy released in both equations, is different for both, so, graphite and diamond do not have equal enthalpy.

Finally, as the combustion of diamond releases more energy that the combustion of graphite (94.5 > 94.05), means that diamond has a higher internal energy than graphite. and Option D can be discarted.

A      b                                              c                     ar e the correect ones

The advantage of the SI system is that It is easy to change from one unit to another. Hence Option (A) is correct.

SI unit is a global system of measurements that ar used universally in technical and research to avoid the confusion with the units.

Having a typical unit system is vital as a result of it helps the complete world to grasp the measurements in one set of unit systems.

The SI covers units for each style of measuring, however at the guts of the SI could be a set of seven units called the 'base units'.

This Systeme International d'Unites of Units is critical to confirm that our everyday measurements stay comparable and consistent worldwide.

Therefore, The advantage of the SI system is that It is easy to change from one unit to another. Hence Option (A) is correct.

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Answer is: C. The FDA tests give reliability to the results of improved health obtained by each company.

The FDA (The Food and Drug Administration) is a federal agency of the United States Department of Health and Human Services.

The FDA controls food safety, tobacco products, dietary supplements, prescription, pharmaceutical drugs, vaccines, biopharmaceuticals, blood transfusions, medical devices, electromagnetic radiation emitting devices, cosmetics and animal food.

The total number of atoms contained in 2.00 moles of nickel is 1.204 × 10²⁴ atoms

HOW TO CALCULATE NUMBER OF ATOMS:

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KNO3 (potassium nitrate) is the substance that is an electrolyte among the given options because it dissolves in water to form ions, which allows it to conduct electricity.

The question asks which substance is an electrolyte from the options provided. An electrolyte is a substance that dissociates into ions when dissolved in water, thereby conducting electricity. Among the options given:

O2 (oxygen) and Xe (xenon) are noble gases and do not form ions in solution, hence they are not electrolytes.

C3H8 (propane) is a hydrocarbon which does not ionize in water, making it a nonelectrolyte.

KNO3 (potassium nitrate) dissolves in water to form potassium (K+) and nitrate (NO3−) ions, which means it is an electrolyte and can conduct electricity.

Therefore, the substance that is an electrolyte among the options is KNO3 (potassium nitrate).