How many kJ are required to heat 62.0 g of ethanol (C₂H5OH) from -2.84 °C to 92.6 'C? The bolling point of ethanol is 78.2 °C while the freezing point is -114.1 °C. The specific
heat capacity of ethanol as a follows: Cs liquid 2.57 J/g °C and Cs gas-1.60 J/gºC. The enthalples of fusion and vaporization are 4.90 kJ/mol and 42.32 kJ/mol, respectively.
Temperature (
78.2°C
-114.1°C
Progress

Answer:

1. The total masses of the products (hydrogen and oxygen gases) is equal to the mass of the water that was decomposed.

2. The number of atoms of each element in the reactants is equal to the number of atoms of each element in the products.

3. The total charge of the reactants is equal to the total charge of the products.

Explanation: water.

Answer:

0.257383555 moles

Explanation:

IV. Molecular formula

a. C₂H₂

b. C₂H₄

V. Emperical formula

a. C₅H₄

b. C₆H₆

VI. a. Reactants: Na₂SO₄(aq) + Ca(NO₃)₂(aq) Products: CaSO₄(s) + 2NaNO₃(aq) Type of reaction: Double displacement

b. Reactants: 3Mg(s) + N₂(g) Products: Mg₃N₂(s) Type of reaction: Combination

VII. a. 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g)

b. Ca₃(PO₄)₂(aq) + 2H₃PO₄(aq) → 3Ca(H₂PO₄)₂(aq)

c. 3NaOH(aq) + FeCl₃(aq) → Fe(OH)₃(s) + 3NaCl(aq)

A double displacement reaction, also known as a double replacement reaction or metathesis reaction, is a type of chemical reaction in which two compounds exchange or switch their constituent ions to form two new compounds.

In this type of reaction, the cations and anions of two ionic compounds exchange places to produce two new compounds, with no change in the oxidation state or charge of the elements involved. The general form of a double displacement reaction is AB + CD → AD + CB, where A, B, C, and D represent different ions or atoms.

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Answer:

The theoretical yield in moles of NH3 is 5.2 moles. This is calculated by dividing the mass of H2 (15.6 g) by the molar mass of H2 (2.016 g/mol) to get the number of moles of H2 (7.76 moles). Then, using the mole ratio from the balanced equation, we can calculate the number of moles of NH3 produced (5.2 moles).

Explanation:

The molecular formula of acetylene is C₂H₂ and ethylene is C₂H₄.

The simplest whole-number ratio of the atoms in a compound is shown by empirical formulae, the number of each type of atom in a molecule is shown by molecular formulas, and the bonds between the atoms in a molecule are shown by structural formulas. The empirical formula of naphthalene is C₁₀H₈ and benzene is C₆H₆.

The chemical formula of the reactants and products are:

The balanced reactions are:

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The cation is mentioned first, followed by the anion, when identifying an ionic compound. Positive and negative charges must be equal. Certain anions with various forms are denoted by Roman numerals.

Ionic compounds, which are neutral substances, are made up of positively charged ions, known as cations, and negatively charged ions, known as anions. substances with binary ions (ionic compounds that contain only two types of elements).

The anion is written after the cation in the name. When a formula unit contains two or more of the same polyatomic ion, the subscript is written outside of the parenthesis.

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5-chloro-4-methyl-2-nonyne is an organic compound with the molecular formula C11H19Cl. It belongs to the class of alkynes, which are hydrocarbons that contain at least one triple bond between two carbon atoms.

The name of the compound indicates that it has a chlorine atom (denoted by "chloro") attached to the fifth carbon atom of the carbon chain, a methyl group (-CH3) attached to the fourth carbon atom, and a triple bond between the second and third carbon atoms of the carbon chain. The carbon chain contains a total of nine carbon atoms (denoted by "nonyne" indicating nine carbons).

The structural formula of 5-chloro-4-methyl-2-nonyne can be written as:

CH3-C≡C-C(CH2)6-Cl

where the triple bond is represented by a "≡" symbol, and the carbon atoms are numbered according to the naming convention.

Answer:

it's an organic compound

Answer:

The digestive system is important to the muscular system because it provides the necessary nutrients and energy required for muscle function and growth. The digestive system breaks down food into smaller molecules such as carbohydrates, proteins, and fats, which are then absorbed into the bloodstream and transported to the muscles. The muscles use these nutrients as fuel for energy during muscle contraction and growth. Additionally, the digestive system helps to eliminate waste products that can impair muscle function, such as lactic acid. Therefore, a healthy digestive system is essential for maintaining optimal muscular function and overall physical performance.

Explanation:

Answer:

A

Refer to pic for explanation

Answer:

Once upon a time, there was a carbon molecule named Carl. Carl was part of a larger molecule called carbon dioxide, which was constantly moving and shifting around in the air.

One day, Carl was breathed in by a plant. The plant used the carbon in Carl's molecule to create energy through a process called photosynthesis. Carl became a part of the plant, helping it to grow and thrive.

Over time, the plant continued to grow and eventually became a tree. Carl's molecule was now a part of the tree, where it helped to create wood and other plant materials.

As the tree grew older, it eventually fell to the ground and began to decompose. Carl's molecule was released back into the air as carbon dioxide, where it joined other carbon molecules in the atmosphere.

Over time, Carl's molecule was breathed in by animals, used in photosynthesis by plants, and released back into the air as part of the natural carbon cycle. Despite the many twists and turns of its journey, Carl's molecule continued to play an important role in the cycle of life on Earth.

Explanation:

The pH at the equivalence point for the titration of 0.20 M HCl versus 0.10 M NaOH is 7.0.

The reaction between HCl and NaOH is a strong acid-strong base titration. At the equivalence point, all of the HCl has reacted with an equal amount of NaOH to form water and NaCl.

The balanced equation for the reaction is:

HCl + NaOH → NaCl + H2O

Since the reaction between HCl and NaOH is a 1:1 stoichiometric ratio, we can say that at the equivalence point, the moles of HCl consumed are equal to the moles of NaOH added.

Moles of HCl = concentration of HCl × volume of HCl used

Moles of NaOH = concentration of NaOH × volume of NaOH added

At the equivalence point, Moles of HCl = Moles of NaOH. Therefore,

concentration of HCl × volume of HCl used = concentration of NaOH × volume of NaOH added

Since we have equal volumes of HCl and NaOH at the equivalence point, we can simplify the equation to:

concentration of HCl = concentration of NaOH

Therefore, the concentration of HCl and NaOH at the equivalence point is both 0.15 M (the average of the initial concentrations of 0.20 M HCl and 0.10 M NaOH).

To find the pH at the equivalence point, we can use the equation for the dissociation of water:

H2O ⇌ H+ + OH-

At 25°C, the concentration of water is 55.5 M. At the equivalence point, the concentration of H+ and OH- are both equal, so we can write:

Kw = [H+][OH-]

where Kw is the ion product constant for water, which has a value of 1.0 × 10^-14 at 25°C.

At the equivalence point, the concentration of H+ and OH- are both equal to the concentration of NaOH and HCl, which is 0.15 M.

Therefore:

Kw = [H+][OH-]

1.0 × 10^-14 = [0.15][0.15]

[H+] = [OH-] = sqrt(1.0 × 10^-14) = 1.0 × 10^-7 M

The pH at the equivalence point is equal to the negative logarithm of the H+ concentration:

pH = -log[H+]

pH = -log(1.0 × 10^-7)

pH = 7.0

Therefore, the pH at the equivalence point for the titration of 0.20 M HCl versus 0.10 M NaOH is 7.0.

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Answer:

we can use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we can find the total number of moles of gas in the container:

n(total) = n(A) + n(B)

To find the number of moles of each gas, we can use the partial pressures and the total pressure:

P(A) / P(total) = n(A) / n(total)

P(B) / P(total) = n(B) / n(total)

We can rearrange these equations to solve for n(A) and n(B):

n(A) = P(A) / P(total) × n(total)

n(B) = P(B) / P(total) × n(total)

We know that the partial pressures of gas A and gas B are 0.264 atm and 0.548 atm, respectively, and we can find the total pressure by adding these partial pressures:

P(total) = P(A) + P(B) = 0.264 atm + 0.548 atm = 0.812 atm

We can also find the total number of moles of gas in the container:

n(total) = PV / RT = (0.812 atm) × (9.10 L) / (0.08206 L·atm/mol·K × 316 K) = 0.286 mol

Now we can add 0.130 mol of a third gas, which gives us a new total number of moles of gas:

n(new) = n(total) + 0.130 mol = 0.286 mol + 0.130 mol = 0.416 mol

Since there is no change in volume or temperature, the new total pressure will be proportional to the total number of moles of gas:

P(new) = P(total) × n(new) / n(total) = (0.812 atm) × (0.416 mol) / (0.286 mol) = 1.18 atm

Therefore, the total pressure will become 1.18 atm.

Blank verse is not a characteristic of a sonnet.

Blank verse is not a characteristic of a sonnet. Sonnets are typically written in iambic pentameter and have 14 lines, and the rhyme scheme varies depending on the type of sonnet. For example, the Shakespearean sonnet typically has the rhyme scheme ABAB CDCD EFEF GG, while the Petrarchan sonnet has the rhyme scheme ABBAABBA CDCDCD or ABBAABBA CDECDE. Blank verse, on the other hand, is unrhymed iambic pentameter and is typically used in longer poems or plays.

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18 moles of oxygen can be produced by decomposing 12 moles of KClO₃.

The balanced chemical equation for the decomposition of KClO₃ is:

2KClO₃ → 2KCl + 3O₂

According to the equation, for every 2 moles of KClO₃ decomposed, 3 moles of O₂ are produced. So, to determine how many moles of O₂ are produced by decomposing 12 moles of KClO₃, we can use the following proportion:

2 moles KClO₃ / 3 moles O₂ = 12 moles KClO₃ / x moles O₂

where x is the number of moles of O₂ produced.

Solving for x, we get:

x = (3 moles O₂)(12 moles KClO₃) / (2 moles KClO₃)

x = 18 moles O₂

Therefore, 12 moles of KClO₃ can produce 18 moles of O₂.

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Answer:

Explanation:

The balanced chemical equation for the reaction between magnesium carbonate and hydrochloric acid is:

MgCO3 + 2HCl → MgCl2 + H2O + CO2

From the equation, we can see that 1 mole of magnesium carbonate reacts with 2 moles of hydrochloric acid to produce 1 mole of carbon dioxide. The molar mass of magnesium carbonate is 84.3 g/mol, which means that 21 g of magnesium carbonate is equal to 0.25 moles (21/84.3). Therefore, 0.25 moles of magnesium carbonate will react with 0.5 moles of hydrochloric acid to produce 0.25 moles of carbon dioxide.

The volume of carbon dioxide can be calculated using the ideal gas law, which is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Assuming standard temperature and pressure (STP) of 273 K and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol, to calculate the volume of carbon dioxide produced.

V = n × 22.4 L/mol

V = 0.25 mol × 22.4 L/mol

V = 5.6 L

Therefore, the volume of carbon dioxide produced when 21 g of magnesium carbonate reacts completely with excess hydrochloric acid is 5.6 L. The answer is option A, 4 dm³, which is approximately equal to 5.6 L.

The theoretical yield for the reaction is 16.97 g MgO.

The percent yield for the reaction is 70.08%.

Let's calculate the moles of Mg and O2:

Moles of Mg = 10.2 g / 24.31 g/mol = 0.420 mol

Moles of O2 = 10.4 g / 32.00 g/mol = 0.325 mol

The theoretical yield of MgO can be calculated using the moles of Mg:

Moles of MgO = 0.420 mol Mg × (2 mol MgO / 2 mol Mg) × (40.31 g/mol MgO) = 16.97 g

Therefore, the theoretical yield for the reaction is 16.97 g MgO.

To calculate the percent yield, we need to compare the actual yield to the theoretical yield:

Percent yield = (actual yield / theoretical yield) × 100%

Percent yield = (11.9 g / 16.97 g) × 100% = 70.08%

Therefore, the percent yield for the reaction is 70.08%.

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The dissolution can be sped up by stirring and it can be slowed by cooling the solution.

Breaking the solid into smaller pieces, grinding it into a powder, or using a solution with a larger surface area can increase the surface area of the solid, making it easier for the solvent to come into contact with the solid and dissolve it faster.

Stirring, shaking, or otherwise agitating the solution can help to increase the mixing of the solvent and the solid, which can speed up the dissolution process.

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The empirical formula of decaborane is B5H7.

To find the empirical formula of decaborane, we need to determine the simplest whole-number ratio of atoms in the compound.

The molecular formula of decaborane is B10H14, which means it contains 10 boron atoms and 14 hydrogen atoms.

To determine the simplest ratio of boron to hydrogen atoms, we can divide each by the greatest common factor (GCF) of the two numbers.

The GCF of 10 and 14 is 2, so we divide each by 2:

B10H14 becomes B5H7

Therefore, the empirical formula of decaborane is B5H7 from B10H14

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Diagram c to the left shows the repeating groups of atoms that make up the samples the chemist mixed together.

Atoms are the smallest unit of matter that make up all physical objects. Atoms are composed of three main components: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus of the atom and have a positive charge, while electrons orbit the nucleus and have a negative charge. Atoms can join together to form molecules, which are the building blocks of all matter. Atoms of different elements can join together in different ways to form compounds and these compounds are the basis of all substances. Atoms are also the basis of all chemical reactions and can exist in different physical states, such as solid, liquid, or gas. Atoms can also be combined to form isotopes, which are atoms of the same element with different numbers of neutrons.

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According to the solving the final temperature of the water is 15.317°C.

When heat flows through an area, the temperature changes, either rising or falling. By examining the reaction and determining if it is endothermic or exothermic, it is possible to determine that this alters chemical equilibria towards the products or reactants.

Q lost by gold = Q gained by water

where Q is the heat absorbed or lost, which can be calculated using:

Q = m * c * ΔT

where m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

First, let's calculate the heat lost by the gold:

Q lost by gold = m * c * ΔT

= 45.5 g * 0.129 J/g°C * (80.5°C - 15.0°C)

= 231.1 J

This heat is gained by the water, so:

Q gained by water = 231.1 J

Using the same formula for the water, we can calculate the final temperature:

Q gained by water = m * c * ΔT

231.1 J = 192 g * 4.184 J/g°C * (T - 15.0°C)

T - 15.0°C = 0.317°C

T = 15.0°C + 0.317°C

T = 15.317°C

the final temperature of the water is 15.317°C.

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You use q = mcT again, but this time you assume qaluminum = qwater and solve for T, which is the ultimate temperature. You must research the specific heat values (c) of aluminum and water.

To calculate the heat capacity of a metal, use Q = smT. (In this calculation, make careful to include the heat given out by the metal, the mass of the metal, and the temperature change of the metal.)

The metal will cool and the water will heat up over time. The two things will eventually have the same temperature. They are then considered to be thermally balanced with one another.

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Considering the definition of synthesis and decomposition reaction, the reaction 2 HCI → H₂ + Cl₂ is considered as a decomposition reaction.

Synthesis or combination reactions occur when two or more reactants form a single product; heat is usually released (exothermic reaction).

The general form of the equation for this type of reaction is the following:

A + B → AB

In a decomposition reaction, a single substance breaks down, producing two or more different substances. This type of reactions can be considered the inverse of synthesis reactions. Heat is usually needed for the reaction to occur.

The general form of these equations is as follows:

AB → A + B

The reaction 2 HCI → H₂ + Cl₂ is considered as a decomposition reaction because hydrochloric acid molecule breaks down to produce hydrogen gas and chlorine gas.

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Answer:

the element is oxygen.

Explanation:

oxygen has six Valence electron which is why it's electron-dot structure also know as Lewis structure has six dots. it also has high electronegativity and form one-to-one bond with magnesium

The presence of water droplets on the cool upper portion of the test tube after heating the compound suggests that water molecules are trapped within its crystal structure. If the substance were a real hydrate, heating it would have caused all of the water molecules to evaporate, leaving behind an anhydrous substance.

What do you mean by crystalline compound?

The presence of water droplets on the cool upper portion of the test tube after heating the compound suggests that water molecules are trapped within its crystal structure. If the substance were a real hydrate, heating it would have caused all of the water molecules to evaporate, leaving behind an anhydrous substance.

However, the residue created a yellow-brown solution after being further dissolved in water, which is a certain sign of contaminants. When dissolved in water, true hydrates always produce a clear, colourless solution. Thus, the fact that the residue resulted in a coloured solution implies that the compound had impurities.

Together, the water stains and contaminants in the leftovers indicate that the original substance was not a genuine hydrate, but rather a mixture of the anhydrous substance and water, which may have been non-stoichiometrically trapped inside the crystal lattice or adsorbed onto the surface of the crystals.

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According to the periodical table's trends, an element with qualities like to sulfur (S) is most likely to mix with mag (Mg), as magnesium has a predisposition to react with sensitive nonmetals the same as sulfur and produce compounds.

For the majority of individuals, regular doses under 350 mg are safe. The adverse effects of magnesium can also include nausea, nausea, diarrhea, and upset stomach in some people. Magnesium is POSSIBLY SAFE Only if TAKEN IN VERY HIGH AMOUNTS (more than 350 mg daily).

And then use magnesium, individuals who have diabetes, digestive disease, heart disease, or renal disease should see their healthcare professional.

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The compounds formed are;

1) [tex]CrBr_{3}[/tex]

2) [tex]Fe_{2} O_{3}[/tex]

3)  [tex]((Hg)_2}) _{2} (CO_{3}) _{2}[/tex]

4) [tex]Ca(ClO_{3} )_{2}[/tex]

5)[tex](NH_{4}) _{3} PO_{4}[/tex]

Ionic compounds are formed through a type of chemical bonding called ionic bonding. Ionic bonding occurs when one or more electrons are transferred from one atom to another, resulting in the formation of ions, which are atoms or molecules that have a net electric charge due to a loss or gain of electrons.

The formation of ionic compounds typically occurs between atoms with large differences in electronegativity, or the ability of an atom to attract electrons.

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Answer:

The specific heat capacity of a substance represents the amount of energy required to raise the temperature of 1 gram of that substance by 1 degree Celsius. A material with a lower specific heat capacity will require less energy to raise its temperature than a material with a higher specific heat capacity.

Therefore, steel is the better conductor of heat because it has a lower specific heat capacity than wood. Steel can transfer heat more quickly than wood due to its lower specific heat capacity.

Explanation:

Rules Governing the Allowed Combinations of Quantum Numbers

The principal quantum range (n) can't be zero. The allowed values of n are consequently 1, 2, 3, 4, and so on. The angular quantum quantity (l) can be any integer between zero and n - 1. If n = 3, for example, l can be either 0, 1, or 2.

The set of quantum numbers n=1,l=1,ml=0,ms=+21 is no longer viable for an electron.

So right set of quantum numbers is n=2,l=1,m=0,s=+21.

Solution : The designation `4p` indicates that the orbital has a important quantum number `n = 4` and an angular-momentum quantum wide variety `l = 1`. The magnetic quantum quantity can have any of the values `-1, 0`, or `+1`.

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