Question 6 if a gas pressure gauge reads 32.0 psi, what is the pressure in inches of mercury? 165 in. hg 15.7 in. hg 65.1 in. hg 32.0 in. hg 6.19 in. hg

There are approximately [tex]3.772[/tex] moles of nitrogen in [tex]83.0 g[/tex] of nitrous oxide [tex](N\(_2\)O)[/tex]

To determine the number of moles of nitrogen in [tex]83.0 g[/tex] of nitrous oxide [tex](N\(_2\)O)[/tex], we need to follow these steps:

1. Calculate the molar mass of [tex]N\(_2\)O[/tex]:

Nitrogen ([tex]N[/tex]) has a molar mass of approximately [tex]14.01 g/mol.[/tex]

Oxygen ([tex]O[/tex]) has a molar mass of approximately [tex]16.00 g/mol.[/tex]

The molar mass of [tex]N\(_2\)O[/tex] is:

[tex]\[\text{Molar mass of N}_2\text{O} = 2 \times 14.01 \, \text{g/mol} + 16.00 \, \text{g/mol} = 28.02 \, \text{g/mol} + 16.00 \, \text{g/mol} = 44.02 \, \text{g/mol}\][/tex]

2. Calculate the number of moles of [tex]N\(_2\)O[/tex] in [tex]83.0 g[/tex]:

[tex]\[\text{Number of moles of N}_2\text{O} = \frac{83.0 \, \text{g}}{44.02 \, \text{g/mol}} = 1.886 \, \text{moles}\][/tex]

3. Determine the number of moles of nitrogen atoms in [tex]N\(_2\)O[/tex]

Each molecule of [tex]N\(_2\)O[/tex] contains [tex]2[/tex] nitrogen atoms. Therefore, the number of moles of nitrogen atoms is twice the number of moles of [tex]N\(_2\)O.[/tex]

[tex]\[\text{Number of moles of nitrogen atoms} = 2 \times 1.886 \, \text{moles} = 3.772 \, \text{moles}\][/tex]

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 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.

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.

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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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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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%.

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.

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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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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In order to prepare 500.0 mL of a 0.100 M NaCl solution, 2.93 g of sodium chloride are required (Option b).

Molarity is the number of moles of solute per liters of solution.

We have 500.0 mL of a 0.100 M NaCl solution. First, we will calculate the moles of solute using the definition of molarity.

M = moles solute / liters solution

moles solute = M × liters solution

moles solute = 0.100 mol/L × 0.5000 L = 0.0500 mol

Next, we will convert 0.0500 moles of NaCl to grams using its molar mass.

0.0500 mol × 58.5 g/mol = 2.93 g

In order to prepare 500.0 mL of a 0.100 M NaCl solution, 2.93 g of sodium chloride are required (Option b).

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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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Final answer:

Elements of Group 4A typically do not form ions readily, but when they do, they generally form positive ions or cations with a +4 charge.

Explanation:

Group 4A elements, also known as the carbon group, typically do not form ions easily. This is because the elements in this group generally have a balance between the energy required to lose or gain electrons, making the formation of ions less favorable. When these elements do form ions, they generally form positive ions or cations. Looking at the periodic table, main-group elements to the left tend to form cations with a positive charge equal to the group number. Conversely, elements to the right, particularly nonmetals, often form anions with a negative charge corresponding to the number of groups they are left of the noble gases. Group 4A elements would thus be expected to form 4+ cations if they were to form ions, which is a high charge and not commonly observed due to the energy involved in removing four electrons.

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.

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:

To determine the number of moles of mercury formed when 1.20 moles of copper react with mercuric nitrate, you need to examine the balanced chemical equation. For every 2 moles of copper that react, 2 moles of mercury are formed. Therefore, if you have 1.20 moles of copper, you will also have 1.20 moles of mercury formed.

In order to determine the number of moles of mercury formed when 1.20 moles of copper react with mercuric nitrate, you need to examine the balanced chemical equation for the reaction. The balanced equation is:

2Cu + Hg(NO3)2 → 2Hg + 2Cu(NO3)2

From this equation, you can see that for every 2 moles of copper (Cu) that react, 2 moles of mercury (Hg) are formed. Therefore, if you have 1.20 moles of copper, you will also have 1.20 moles of mercury formed in the reaction.

Given the balanced equation for the reaction of copper with mercuric nitrate, 1.20 moles of copper will produce 1.20 moles of mercury.

Given the reaction between copper and mercuric nitrate, we can use stoichiometry to determine the moles of mercury produced. The balanced chemical equation for this type of reaction is:

Cu + Hg(NO₃)₂ → Cu(NO₃)₂ + Hg

From this equation, we see that 1 mole of copper (Cu) reacts with 1 mole of mercuric nitrate (Hg(NO₃)₂) to produce 1 mole of mercury (Hg).

Since we have 1.20 moles of copper reacting, we can directly infer that:

1.20 moles of Cu → 1.20 moles of Hg

Answer:

It is negative

Explanation: