Calculate each of the following quantities:
(a) Mass (g) of solute in 185.8 mL of 0.267 M calcium acetate

Answer:

6

Explanation:

Answer: 6

Explanation:

I just took this thang

Answer:

oppositely charged ions in a chemical compound

Explanation:

Answer:

Between ions

Explanation:

Answer:

2nd or 3rd dyfudhfkfhxhxhxjxjcjcifid

Answer:

Chemical reaction are irreversible. Some of the example of chemical reaction are cooking, rusting, and burning. During a chemical reaction, the composition of substances changes and the particles rearrange to form a new substance. The new substance formed after chemical reaction of substance has different  physical and chemical properties.

When a chemical reaction occur, the atoms or molecules of the substances change its physical and chemical properties such as while cooking of vegetable, the molecules of vegetable undergo changes in their properties and form a new substance which is different from the earlier.

Hydrogenated compounds, particularly hydrogen gas (H2), are often considered as potential fuels for spark ignition engines.

Hydrogenated compounds are considered the most suitable fuels for spark ignition engines because hydrogen is a highly flammable gas with a low ignition energy and a wide flammability range. When compared to gasoline or diesel, hydrogen has a higher energy content by weight, which makes it an attractive fuel choice.

Due to increasing temperature, the chemical reaction rate also increases as the element moves from a solid to a liquid to a gas.Physical state transitions are dependent on temperature, and the rate of chemical reactions that occur as a result of these state transitions is also influenced by temperature.

At higher temperatures, the chemical reaction rate typically rises as molecules have more kinetic energy and collide with one another more frequently.

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Considering the Dalton's partial pressure, the partial pressure of nitrogen and oxygen is 3.634 atm and 0.966 atm  respectively.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

\(P_{T} =P_{1} +P_{2} +...+P_{n}\)

where n is the amount of gases.

Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture.

The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present:

\(x_{A} =\frac{n_{A} }{n_{total} }\)

So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

\(P_{A} =x_{A} P_{T}\)

In this case, the mixture contains 5.4 mol of nitrogen and 1.4 mol of oxygen. So, the total number of moles of all the components present is 5.4 moles + 1.4 moles=  6.8 moles.

Then, the mole fraction of each gas can be calculated as:

So, being 4.6 atm the total pressure of the gas mixture, the partial pressure of each gas can be calculated as:

\(P_{nitrogen} =x_{nitrogen} P_{T}\)= 0.79× 4.6 atm= 3.634 atm

\(P_{oxygen} =x_{oxygen} P_{T}\)= 0.21× 4.6 atm= 0.966 atm

In summary, the partial pressure of nitrogen and oxygen is 3.634 atm and 0.966 atm  respectively.

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The volume of CO2 at STP =124.298 L

Given

Reaction

4 KMnO4, +4 C3H5(OH)5, -7K2CO3, + 7 Mn2O3, +5 CO2, + 16 H2O

701,52 g of KMnO4

Required

volume of CO2 at STP

Solution

mol KMnO4 (MW=158,034 g/mol) :

mol = mass : MW

mol = 701.52 : 158.034

mol = 4.439

mol CO2 from equation : 5/4 x mol KMnO4 = 5/4 x 4.439 = 5.549

At STP 1 mol = 22.4 L, so for 5.549 moles :

=5.549 x 22.4

=124.298 L

Answer:

T₂ = 800 K

Explanation:

Given that,

Initial temperature of the gas, T₁ = 127°C = 400 K

Initial volume, V₁ = 10 L

Final volume, V₂ = 20 L

We need to find the new temperature.

The volume of a gas is directly proportional to its Kelvin temperature.

Let T₂ is the new temperature. So,

\(\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{20\times 400}{10}\\\\T_2=800\ K\)

So, the new temperature of the gas is 800 K.

The compound that is composed of calcium and chlorine is CaCl₂

To know which of the compound that contains calcium and chlorine, we must know the symbol of calcium and chlorine. This is shown below:

Calcium is a group 2 element with atomic number of 20 and a symbol of Ca

Chlorine is a group 17 element with atomic number of 17 and a symbol of Cl

With the above information, we can determine the compound that contains calcium and chlorine as follow:

The compound that contains calcium and chlorine must have Ca and Cl in it.

Thus, the compound that contains calcium and chlorine is CaCl₂

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Answer:

neutralise

Explanation:

There is a special name given to the reaction between an acid and a base to form salt and water and water only. That name is 'neutralization'. Hence to 'neutralize' an acid connotes the idea of 'cancelling' the effect of an acid.

An acid has a number of deleterious effects on surfaces, the most prominent of which is corrosion of the surface due to oxidation. If a surface is accidentally exposed to an acid, the effect of that acid on the surface can be counteracted by the immediate application of a base to 'neutralize' the acid. Neutralization in this sense is akin to 'cancelling' out the acid.

The examples are endless. Another common example is the neutralization of an acidic soil by a base in order to 'cancel' the acidity of the soil and make the soil fertile for plant growth.

The H2O(ℓ) ⇄ H2O(s) response is ΔG° and is expected to be closest to ΔH°.

Option c is correct.

We would expect ΔG° to be closest to ΔH° for the reaction in which the reactant and product states are most similar. Therefore, the reactions in which ΔG° is expected to be closest to ΔH° are those involving a phase change from gas to solid or liquid. This is because they typically involve small changes in entropy (ΔS°).

The third reaction given is H2O(ℓ) ⇄ H2O(s), which involves a phase change. This is a reversible reaction involving melting or freezing of water, and the difference between the standard change in free energy (ΔG°) and the standard change in enthalpy (ΔH°) is expected to be small. Therefore, ΔG° is expected to be the closest to ΔH° for this reaction.

Hence, Option c is correct.

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If you remove two protons and two electrons from a sulfur atom (S), the resulting element is D., Si which has an atomic number of 14  If you remove two protons and two electrons from a sulfur atom (S), the new element formed is:

A.Si

Explanation:
1. A sulfur atom has 16 protons and 16 electrons.
2. Remove two protons: 16 - 2 = 14 protons.
3. Remove two electrons: 16 - 2 = 14 electrons.
4. The element with 14 protons is silicon.

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There is a way to decrease the concentration of an ion here. The carbonate ion happens to be easy to decrease. All we have to do is add some acid (say HCl) to the container. The following sequence of reactions explains how this WO r ks.

As long as more acid is added, this process will continue until all the solid Zn CO3 has been dissolved

Answer:

She needs to know the Mass and acceleration

Janet needs to know the mass of the box and acceleration .

Force is defined as a cause which is capable of changing the motion of an object. It can cause an object  which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.

It has SI units of Newton  and is represented by'F'.Newton's second law states that force which acts on an object  is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.

The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.

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Answer:

H2+Cl2--->2 HCl

Explanation:

Hydrogen +Chloride gives out 2 moles of HCl

Energy from various sources is stored, transmitted, and utilised in a number of ways. Electrical energy, for example, is often stored in batteries and delivered via power lines.

It is then utilised to power various gadgets ranging from lightbulbs to laptops. Solar energy is similarly stored in solar panels and transmitted via electrical connections. This energy is then converted into electricity and utilised to power homes, companies, and other purposes.

Furthermore, natural gas, oil, and other fossil fuels are transported through a pipeline network and used to generate electricity and heat buildings. Nuclear energy is also stored, transferred, and used to create power via a network of pipelines. Finally, wind energy is stored in enormous batteries and distributed via electrical wires.

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7. the pH of 0.81 M Mg(OH)₂ solution is 9.19.

8. the pH of 0.27 M pyridine solution is 9.11.

Mg(OH)₂ is a base which dissociates to produce two OH⁻ ions.

Mg(OH)₂ → Mg²⁺ + 2 OH⁻

Let the concentration of OH⁻ ions produced be x.

Therefore, the concentration of Mg²⁺ is 0.81-x

Mg(OH)₂ → Mg²⁺ + 2 OH⁻

Initial concentration (M)    0         0

Change (M)                 -x         +2x

Equilibrium Concentration  0.81-x      x     x

Using Kb for Mg(OH)₂,Kb = Kw/Ka

Kw = 1.0 × 10⁻¹⁴ at 25 °C.

For Mg(OH)₂,Kb = [Mg²⁺][OH⁻]²/Kw= (x)²/0.81 - x

Kb = 4.5 × 10⁻¹² = x²/0.81 - x

On solving the equation,x = 7.7 × 10⁻⁶M

Therefore, the concentration of OH⁻ ions = 2 × 7.7 × 10⁻⁶ = 1.54 × 10⁻⁵ M

To calculate the pH of the solution, use the formula:

pOH = - log [OH⁻]= - log 1.54 × 10⁻⁵pOH = 4.81pH = 14 - 4.81 = 9.19

Thus, the pH of 0.81 M Mg(OH)₂ solution is 9.19.

Let the concentration of OH⁻ ions produced be x.

Therefore, the concentration of C₅H₅NH⁺ is 0.27 - x.

C₅H₅N + H₂O ⇌ C₅H₅NH⁺ + OH⁻

Initial concentration (M)   0.27      0

Change (M)                -x       +x

Equilibrium Concentration  0.27-x     x

Using Kb for C₅H₅N,Kb = Kw/Ka

Kw = 1.0 × 10⁻¹⁴ at 25 °C.

For C₅H₅N,

Kb = [C₅H₅NH⁺][OH⁻]/[C₅H₅N]= (x) (x)/(0.27-x)Kb = 1.7 × 10⁻⁹

= x²/(0.27-x)

On solving the equation,

x = 1.3 × 10⁻⁵ M

Therefore, the concentration of OH⁻ ions = 1.3 × 10⁻⁵ M

To calculate the pH of the solution, use the formula:

pOH = - log [OH⁻]= - log 1.3 × 10⁻⁵pOH

= 4.89pH = 14 - 4.89 = 9.11

Thus, the pH of 0.27 M pyridine solution is 9.11.

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Generating electricity from the given list option is the use of geothermal, therefore the correct option is A .  

It is a type of power plant in which the power is generated with the help of a nuclear reactor involving a nuclear which could be either nuclear fission or fusion reaction.

Fueling vehicles, capturing solar power, and powering hybrid vehicles do not use geothermal energy.

Generating electricity from the given list option is the use of geothermal, therefore the correct option is A.

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The point that we can see in the graph from 0 s to 2s is the point of constant velocity.

A horizontal line on a velocity-time graph indicates the location of the point of constant velocity. On the graph, a horizontal line denotes that the object's velocity was constant during that time.

Keep in mind that a velocity-time graph shows how an object's velocity changes over time. An object is said to be travelling at a constant speed if a horizontal line shows that it is doing so while maintaining its direction and speed.

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During an isobaric expansion, the temperature of the gas increases.

An isobaric process is a thermodynamic process that occurs at a constant pressure. During an isobaric expansion, the volume of the gas increases while the pressure remains constant. Since the gas does work on the surroundings by expanding, it loses internal energy, which results in a decrease in temperature. However, since the pressure is constant, the gas can exchange heat with its surroundings, and if the heat added is greater than the work done, the gas gains energy and its temperature increases. Therefore, during an isobaric expansion, the temperature of the gas increases if the heat added to the system is greater than the work done by the gas.

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Answer:

1.74 g/cm3

Explanation:

density=mass/volume

Explanation:

density = 1300/743

or density=1.74g/cm3

Explanation:

\(31.5 \: g \: aommnia \: \times \: \frac{1 \: mol \: ammonia}{8 \: g \: ammonia \: } \: \times \frac{3 \: mol \: hydrogen}{2 \: mol \: ammonia} \: \times \frac{1 \: g \: hydrogen}{1 \: mol \: hydrogen} = \: 5.90625 \: g \: hydrogen \: must \: react \: \)

Answer:

The 2 would be placed in front of the reactant Na and in front of the product NaCl

2Na + Cl2 = 2NaCl

Explanation:

This is because the ratio of elements needs to be balanced on both sides.

On the reactants side, there are 2 Na molecules and 2 Cl molecules

On the products side, there are 2 Na molecules and 2 Cl molecules

So, now the equation is balanced

A dipole moment is the development of a  positive end and a negative end within a bond due to the sharing of electrons.

All atoms include this stable subatomic particle, which serves as the main electrical conductor in solids. It has a charge of negative electricity.

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Answer:

the answer is b beacuse the substance changed

Answer:

do that in calc

Explanation:

mass of cu = 63.55 ÷ 79.55 × 15.9

Answer:

1.2353 mol

Explanation: