Convert 7g/dm^3 of H2O to mol/dm^3

A liquid is allowed to evaporate and leaves no residue. It can not be determined whether it was an element, a compound, or a mixture.

A water vapor molecule stays roughly 10 days in the atmosphere after it has evaporated. Water vapor starts to cool back down as it ascends higher in the atmosphere. The water vapor condenses when it becomes cold enough, turning it back into liquid water. Eventually, individual water droplets will condense to create clouds and precipitation.

It is not possible to determined whether it would be an element, a compound and mixture because the size of the particle will be too less.

A method for separating homogenous mixtures with one or even more dissolved salts is called evaporation. The procedure separates the liquid from the solid components. Usually, the procedure entails heating the combination until there is no more liquid is present.

Therefore, it can not be possible to determined whether it was an element, a compound, or a mixture by evaporation.

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Answer:

Explanation:

In the cycle, after a new moon, waxing means light appears on the right side of the moon and continues to increase.

Yield of reaction = 80%

Reaction

Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)

mol Cu(NO₃)₂ :(MW 187,56 g/mol)

\(\tt \dfrac{469}{187.56}=2.5\)

mol Na₂S :(MW 78,0452 g/mol)

\(\tt \dfrac{156}{78.0452}=2\)

 Limiting reactant⇒Na₂S( 2 < 2.5)

mol of NaNO₃ (MW = 84,9947 g/mol)

\(\tt 2\times 2=4\)

mass  NaNO₃ (theoretical)

\(\tt 4\times 84.9947=339.979~g\)

\(\tt \dfrac{272}{339.979}=0.8\rightarrow=80\%\)

Step 1

a. Please look at the next drawing:

First compound: C2H4

H = enthalphy = energy

H(C2H4) = H(C=C) + 4 x H(C-H) = 358 + 4 x 413 = 2010

------

Second compound: F2

H(F-F) = 154

------

Third compound: C2H4F2

H(C2H4F2) = 2 x H(C-F) + 4 x H(C-H) + H(C-C) = 2 x 485 + 4 x 413 + 495 = 3117

Therefore, ΔH = H products - H reactants = 3117 - (2010 + 154) = 953

Answer: ΔH = 953

Answer:

V = 2,707.89 cm^3      V = 2,521.96 cm^3

Explanation:

Width x Length x Height = Volume

V = 10.62 x 83.6 x 3.05

V = 2,707.89 cm^3

83.6 - 5.74 = 77.86

V = 10.62 x 77.86 x 3.05

V = 2,521.96 cm^3

The volume of an object that is 83.6 cm long is 2,707.89 cm³. And the volume after 5.74 cm is cut off from the long edge is  V = 2,521.96 cm³.

Volume is the space occupied by an object, It can be calculated by dividing the mass and density.

Given the volume of an object that is 83.6 cm long.

The width is 10.62 cm

The thickness is 3.05 cm

Here, the volume of an object with given dimensions is to be calculated by the volume of a rectangle formula. Because there is thickness, width, and volume is given, it can be a rectangle.

Width x Length x Height = Volume

V = 10.62 x 83.6 x 3.05

V = 2,707.89 cm³

83.6 - 5.74 = 77.86

V = 10.62 x 77.86 x 3.05

V = 2,521.96 cm³

Thus, the volume will be 2,707.89 cm³. And after the cut volume will be 2,521.96 cm³.

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To calculate the work (w) done by the nitrogen gas in joules, we need to use the formula:

w = -PΔV

Where P is the pressure in atmospheres, ΔV is the change in volume in liters, and the negative sign indicates that the gas is doing work on its surroundings.

In this case, P = 25 atm, ΔV = 10.0 L (since the volume increases from 5.0 L to 15.0 L), and we convert the units of pressure and volume to SI units:

P = 25 atm x 101.3 kPa/atm = 2532.5 kPa
ΔV = 10.0 L x 0.001 m3/L = 0.01 m3

Substituting these values into the formula, we get:

w = -2532.5 kPa x 0.01 m3 = -25.325 J

Since the given conversion factor is 1 atm.L = 101.3 J, we can convert the units of work from joules to atm.L:

w = -25.325 J ÷ 101.3 J/atm.L = -0.25 atm.L

Therefore, the work done by the nitrogen gas is -0.25 atm.L, which indicates that the gas is doing work on its surroundings.
To calculate the work (w) done by the nitrogen gas as its volume increases from 5.0 L to 15.0 L against a constant pressure of 25 atm, we can use the formula:

w = -PΔV

where w is the work done, P is the constant pressure (25 atm), and ΔV is the change in volume (15.0 L - 5.0 L = 10.0 L).

w = -25 atm * 10.0 L

Now, we need to convert the work to Joules using the conversion factor 1 atm·L = 101.3 J:

w = -25 atm * 10.0 L * (101.3 J / 1 atm·L)

w = -25 * 10.0 * 101.3 J

w = -25325 J

So, the work done by the nitrogen gas is -25325 Joules.

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The correct order of the increasing polarity of the analyte functional group isEthers < Esters.

The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters."  The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.

To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.

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Plato was a Greek philosopher who lived from 428/427 BC to 348/347 BC. He was a student of Socrates and a teacher of Aristotle. Plato is known for his philosophical writings, particularly his dialogues, which are written as conversations between Socrates and other characters.

He believed in the existence of an eternal realm of abstract ideas, which he called the Forms or Ideas, and argued that the material world we perceive with our senses is only a shadow or copy of this realm. Plato's ideas about knowledge, reality, and the nature of the human soul continue to be influential in Western philosophy today.
In terms of limestone, it is a sedimentary rock that is composed mainly of calcium carbonate. It is formed over millions of years from the accumulation of organic materials and minerals, and can be found all over the world. Limestone has been used for centuries in architecture, construction, and sculpture due to its durability and aesthetic appeal. It is also an important component in the production of cement and other industrial materials. Understanding the properties and uses of limestone is important in many fields, from geology to engineering.
It seems like you are looking for information about Plato and limestone. Plato was a Greek philosopher and the founder of the Academy in Athens, which was the first institution of higher learning in the Western world. He was a student of Socrates and a teacher of Aristotle, and his works have greatly influenced Western philosophy, particularly in the areas of metaphysics, epistemology, and ethics.
On the other hand, limestone is a sedimentary rock primarily composed of calcium carbonate (CaCO3) in the form of the mineral calcite. It is formed from the remains of marine organisms such as shells, coral, and other calcareous materials, which accumulate on the seafloor over time. Limestone has numerous uses, including as a building material, in the production of cement, and as a soil conditioner to neutralize acidic soils.
While Plato and limestone might not seem directly related, one possible connection could be that ancient Greek architecture, which was influential in Plato's time, often utilized limestone as a building material due to its durability and accessibility. This allowed for the construction of the temples, public buildings, and other structures that formed the backdrop of Plato's philosophical ideas and teachings.

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If the process is irreversible, the entropy change may be positive, negative, or zero, depending on the direction of heat flow.

The relation for entropy change for a reversible process is given by the equation ΔS = Qrev/T, where ΔS is the change in entropy, Qrev is the heat absorbed or released during the reversible process, and T is the temperature at which the process occurs. In a reversible process, the entropy change is positive for an increase in temperature and negative for a decrease in temperature. This equation is important in thermodynamics because it allows us to calculate the change in entropy for a reversible process and determine the maximum efficiency of a heat engine.

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The volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.

The volume of a gas can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where;

0.0345 × V = 0.55 × 0.0821 × 295

0.0345V = 13.32

V = 386L

Therefore, the volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.

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Answer:

The answer is 34.2 L.

Explanation:

Ideal Gas Law = PV = nRT
(where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.)

Plug in the known values into the Ideal Gas Law equation:

3.5 kPa * V = 0.55 moles * 8.31 J/mol*K * 295 K

Finally, solve for V:

V = (0.55 moles * 8.31 J/mol*K * 295 K) / 3.5 kPa

= 34.2 L

steps that are followed in taking a stratified random sample are

i. Take a sample of size n/k from each strata, where n is the sample size and k is the number of strata

iv. Take a systematic sample from the population as a whole. Take random samples from each strata.

Stratified random sampling is a sampling method that divides the population into smaller groups called layers. Groups or hierarchies are organized based on the common characteristics or attributes of the members in the group. The process of dividing the population into groups is called hierarchization.

Stratified Random Sample Example:

Suppose a research team wants to determine a GPA for a college student in the United States. The research team is having a hard time collecting data from all 21 million college students. We decided to use 4,000 students to extract a random sample of the population.

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Answer:38°

Explanation:

The classification of controlled substances that contains drugs with a high potential for abuse and addiction, but are approved for medical use is Schedule II.

The Drug Enforcement Administration (DEA) has five classifications, or schedules, for controlled substances based on their potential for abuse, medical use, and safety. Schedule II substances have a high potential for abuse and may lead to severe psychological or physical dependence, but they also have a currently accepted medical use in the United States with severe restrictions.

Examples of Schedule II substances include opioids such as fentanyl, oxycodone, and hydrocodone, as well as stimulants such as amphetamine and methylphenidate. These substances require a written or electronic prescription and cannot be refilled without a new prescription from a doctor.

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In order for a titration to be effective, the reaction must produce a precipitate. The correct answer is option B, "reaction must produce a precipitate."

For a titration to be effective, the reaction must be stoichiometric, quantitative, and rapid. A stoichiometric reaction is one in which the amount of reactants is proportional to the amount of products.

A quantitative reaction is one in which all the reactants are consumed, leaving no excess. A rapid reaction is one that occurs quickly and does not take a long time to complete.

However, a reaction producing a precipitate is not necessary for the titration to be effective. Hence option B is correct.

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Answer: The answer is Emission

Explanation:

I just got it right on my test, not really good with explaining. hope this helped

Explanation:

Mole Ratio of O₂ : NO

Based on the balanced equation, the mole ratio of O₂ : NO is 5 : 4

∴ for every mole of O₂ reacted, ⁴/₅ moles of NO is produced

Moles of NO

since the number of mol of O₂ =  2.0 mol

   then moles of NO produced = 2.0 mol × ⁴/₅

                                                   =  1.6 mol

∴ the moles of nitrogen monoxide that will form if we start with 2.0 moles of oxygen is 1.6 mol (option 5).

Answer:

The heat required to boil water is called the heat of vaporization, and it is the amount of energy required to change the state of a substance from a liquid to a gas at a constant temperature. The heat of vaporization for water is approximately 40.7 kJ/mol or 2257 J/gram.

To calculate the heat required to boil 50.0 grams of water, you would multiply the heat of vaporization (2257 J/g) by the number of grams of water:

Heat (J) = 2257 J/g x 50 g

Heat (J) = 112,850 J

To convert Joules to kilojoules (kJ), divide by 1000.

Heat (kJ) = 112,850 J / 1000 = 112.85 kJ

Therefore, it takes 112.85 kJ of heat to boil 50.0 grams of water.

Answer:

\(31.8\ moles = 1.91 * 10^{25}\ molecules\)

Explanation:

Given

31.8 moles of water

Required

Determine the number of molecule

In standard units: 1 molecule of water is:

\(1\ mole = 6.022 * 10^{23}\ molecules\)

Multiply both sides by 31.8

\(31.8 * 1\ mole = 31.8 * 6.022 * 10^{23}\ molecules\)

\(31.8\ moles = 31.8 * 6.022 * 10^{23}\ molecules\)

\(31.8\ moles = 191.4996 * 10^{23}\ molecules\)

Express 191.4996 as a standard form

\(31.8\ moles = 1.914996 * 10^2 * 10^{23}\ molecules\)

Apply law of indices:

\(31.8\ moles = 1.914996 * 10^{2+23}\ molecules\)

\(31.8\ moles = 1.914996 * 10^{25}\ molecules\)

Approximate:

\(31.8\ moles = 1.91 * 10^{25}\ molecules\)

The amount of ionization produced in the air when ionizing radiation is present is known as ionization.

Ionization is the process by which an atom or molecule loses or gains an electron, resulting in a charged particle known as an ion.

Ionization can occur due to various physical and chemical processes, such as exposure to high-energy radiation or contact with an electrically charged object.

In the given question, the amount of ionization produced in the air when ionizing radiation is present is known as ionization.

Therefore, the answer is ionization.

The amount of ionization produced in the air when ionizing radiation is present can be measured using units such as the Roentgen (R) or Gray (Gy).

Radiation can have both positive and negative effects on living organisms.

Ionizing radiation is particularly harmful as it can cause damage to DNA and other cellular components, leading to mutations, cancer, and other diseases.

It is important to take appropriate safety measures when working with ionizing radiation to minimize exposure and potential harm.

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When it comes to chemical formulas, the chemical formula is used to show the elements that make up a compound. For instance, water has the chemical formula H2O, which shows that it is made up of two hydrogen atoms and one oxygen atom.

Hydrogen ion (H+) has the chemical formula H+

Hydroxide ion (OH-) has the chemical formula OH-

Hydronium ion (H3O+) has the chemical formula H3O+.

The chemical formulas of hydrogen ion, hydroxide ion, and hydronium ion are:

H+ for hydrogen ion OH- for hydroxide ionH3O+ for hydronium ion.

An ion is an atom or a molecule that has gained or lost electrons. These atoms or molecules become charged ions due to their gain or loss of electrons. Hydrogen ion, hydroxide ion, and hydronium ion are three of the most common ions in aqueous solution that have a significant impact on chemical reactions. The hydrogen ion, which has a positive charge, is an essential component of many chemical reactions, particularly those that take place in water. It is represented by the chemical symbol H+. The hydroxide ion, which has a negative charge, is also a crucial component of many chemical reactions, particularly those that take place in water. It is represented by the chemical symbol OH-.The hydronium ion, which has a positive charge, is another important component of many chemical reactions, particularly those that take place in aqueous solutions. It is represented by the chemical symbol H3O+.

In summary, hydrogen ion, hydroxide ion, and hydronium ion are important components of many chemical reactions. They have different chemical formulas, with hydrogen ion being represented by H+, hydroxide ion by OH-, and hydronium ion by H3O+.

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The three main types of extraction methods are: Liquid-liquid extraction, Solid-phase extraction and Supercritical fluid extraction.

The three main types of extraction methods are:

These extraction methods are widely used in chemistry, biochemistry, and other fields for the isolation, purification, and analysis of a variety of compounds. The choice of extraction method depends on the nature of the sample and the properties of the target compound.

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Answer:

the answer is b, which is one

Scientists determine a nucleus' location within an atom by A. measuring half the distance between the nuclei of two bonded atoms.

The Covalent radius is a value used to understand the covalent bonded atoms, while the atomic number refers to the number of protons and neutrons that are present in a given atomic nucleus, which allows us to obtain the relative distance between one atom and other atoms.

This value (the atomic number) is useful in chemistry in order to determine different elements since they are composed of a variable number of positively charged protons and neutrons in the nucleus, as well as the number of negatively charged electrons in the orbitals of the atom.

Therefore, with this data, we can see that the Covalent radius and atomic number are fundamental in order to determine the number of protons and neutrons and this info is associated with the relative distance observed between two bonded atoms.

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(a) Approximately x% of regular-grade gasoline is sold between $3.23 and $3.63 per gallon. (b) Approximately x+% of regular-grade gasoline is sold between $3.23 and $3.83 per gallon. (c) Approximately x% of regular-grade gasoline is sold for less than $3.81 per gallon.

To calculate the percentage of gasoline sold within a specific price range, we need to determine the proportion of the total range that falls within the given prices.

(a) Price range: $3.23 to $3.63 per gallon

Total range: $3.63 - $3.23 = $0.40 per gallon

Proportion within the range: ($3.63 - $3.23) / ($3.63 - $3.23) = 1

Percentage: 1 × 100% = 100%

(b) Price range: $3.23 to $3.83 per gallon

Total range: $3.83 - $3.23 = $0.60 per gallon

Proportion within the range: ($3.83 - $3.23) / ($3.83 - $3.23) = 1

Percentage: 1 × 100% = 100%

(c) Price limit: $3.81 per gallon

Percentage: 100% - x% (since it is specified that it is "less than" $3.81)

Please note that without specific numerical values for x, we cannot provide the exact percentages. However, the calculations above outline the method to determine the percentages based on the given price ranges.

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The different methods that can be used to create electrodes on a Borosilicate wafer are of standard and thin wall configurations.

The use of standard with filament configuration and thin wall configurations comes in different barrel sizes of one, two, three, five, and seven barrels. The capillaries that line the wall of the glass have the electrodes with the association, if needed, a wire that runs along to the record.

The thin wall single barrel configurations may be fitted with two electrodes. They do not use filings like with the standard configurations.

In order to use a silicon wafer, the additional step that is done is doping. Doping is the introduction of some impurities to the semiconductors to make them more electrically active.

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Answer:

.5

Explanation:

Answer:

1.5

Explanation:

1.5

The statement that proteins have an asymmetrical tertiary structure, while multi-subunit proteins can exhibit several types of symmetry is a true one.

Proteins are called complex macromolecules which consists of one or more polypeptide chains that fold into different three-dimensional structures. The polypeptide chains in a protein are asymmetric, but the overall multi subunits in the protein structure exhibits a wide variety range of symmetries. Because the classes of point-group symmetry involves a defined number of subunits to be arranged about one or more axes of symmetry. Thereby the symmetry reduces when more than one polypeptide chain is incorporated into a specific subunit of the protein thereby resulting in the formation of one more asymmetric unit in the strucure of protein.

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