The enthalpy change for the complete burning of one mole of a substance
is the enthalpy of _______

thermochemical equation

combustion

released

vaporization

fusion

absorbed

heat

Based on the percentage mass of oxygen in trifluoroacetic acid, the mass of the trifluoroacetic acid sample is 168.5 grams.

The percentage mass of oxygen in trifluoroacetic acid is determined as follows:

The molar mass of trifluoroacetic acid = 12 * 2 + 1 + 19 * 3 + 16 * 2

The molar mass of trifluoroacetic acid = 114 g

The percentage mass of oxygen in trifluoroacetic acid = (16 * 2)/114 * 100%

The percentage mass of oxygen in trifluoroacetic acid = 28.07%

The mass of the trifluoroacetic acid sample will be 47.3/ 28.07% = 168.5 grams

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The balanced equation of the reaction is:C5H12 + 8O2 → 5CO2 + 6H2OFrom the equation, it shows that 8 moles of oxygen is needed to burn 1 mole of pentane. The volume of oxygen needed for the entire burning process of 18 grams of pentane in normal conditions is 44.86 L.

First, let's convert 18 grams of pentane to moles using the molar mass of pentane (C5H12) as follows:Mass of pentane = 18 g Molar mass of pentane (C5H12) = 5(12) + 12(1) = 72 g/molNumber of moles of pentane = Mass/Molar mass = 18/72 = 0.25 moles

Now, to find the volume of oxygen needed for its entire burning process in normal conditions, we'll use the Ideal Gas Law equation as follows: n = PV/RT where :n = number of moles of the gas V = volume of the gas (in liters)P = pressure of the gas (in atmospheres)R = Universal Gas Constant = 0.0821 L· atm /K· molT = temperature of the gas (in Kelvin)From the equation, we know that 8 moles of oxygen are needed to burn 1 mole of pentane.

Therefore, the number of moles of oxygen needed to burn 0.25 moles of pentane will be: n = 8 × 0.25 = 2 moles The temperature and pressure are normal conditions, which is 0°C and 1 atm respectively. Let's convert the temperature to Kelvin:T = 0 + 273 = 273 K Substituting the values into the Ideal Gas Law equation gives: P × V = nRT Rearranging the equation gives: V = nRT/P  Substituting the values, we get: V = 2 × 0.0821 × 273/1V = 44.86 L

Therefore, the volume of oxygen needed for the entire burning process of 18 grams of pentane in normal conditions is 44.86 L.

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At the constant pressure, the final volume of the gas was equal to 331.2 L at a temperature of 398K.

Charles's law can be described as the volume of gas being directly proportional to its temperature at constant pressure,

So, V∝ T

or         \({\displaystyle \frac{V_1}{T_1} =\frac{V_2}{T_2}\)                                                       ....................(1)

Given, the initial temperature of the gas, T₁ = 298 K

The final temperature of the gas, T₂ = 398 K

The initial volume of the gas, V₁ = 248 L

Substitute the value of V₁, T₁ and T₂ in equation (1), we will get;

     \({\displaystyle \frac{V_1}{T_1} =\frac{V_2}{T_2}\)      

V₂ = V₁.T₂/T₁

V₂ = 248 ×398 /298  

V₂ = 331.2 L

Therefore, the final volume of the gas is equal to 331 L at 398 K, when there is no change in the pressure.

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Answer:

\(\boxed {\boxed {\sf Almost \ all \ phosphates \ are \ insoluble}}\)

Explanation:

For magnesium phosphate to make an aqueous solution, it must be soluble in water.

Let's check the solubility rules. There are many different lists and versions, but it should mention a rule about phosphates.

Magnesium phosphate is included in "all phosphates" so it is insoluble and can't become an aqueous solution.

Magnesium Phosphate (Mg₃(PO₄)₂) would not make an aqueous solution because it is insoluble in water.

A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.

According to the solubility rule, all phosphates are insoluble in water except sodium and potassium phosphates and thus magnesium phosphate does not form an aqueous.

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To determine the number of chloride ions (Cl-) in 250 mL of a 0.2M magnesium chloride solution, we need to use the formula:

number of ions = concentration (M) * volume (L) * Avogadro's number

In this case, the concentration is 0.2 M, the volume is 250 mL, and Avogadro's number is 6.022 x 10^23 ions/mol.

To convert the volume from milliliters to liters, we can divide the volume by 1000. This gives us a volume of 250 mL / 1000 mL/L = 0.250 L.

Substituting these values into the formula above, we get:

number of ions = 0.2 M * 0.250 L * 6.022 x 10^23 ions/mol

= 0.2 M * 0.250 L * 6.022 x 10^23 ions/mol

= 1.204 x 10^23 ions

Therefore, there are approximately 1.204 x 10^23 chloride ions (Cl-) in 250 mL of a 0.2M magnesium chloride solution.

Answer: There are 0.523 moles of Titanium in \(3.15\times 10^{23}\) atoms of Titanium

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number \(6.023\times 10^{23}\) of particles.

To calculate the moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}\)

\(\text{Number of moles of Titanium}=\frac{3.15\times 10^{23}}{6.023\times 10^{23}}=0.523moles\)

The oxidation number of Ag in Ag2O is +1.

In Ag2O, there are two silver atoms (Ag) and one oxygen atom (O). Oxygen is known to have an oxidation number of -2 in most compounds. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must equal zero.

Therefore, the oxidation numbers of the two silver atoms must add up to +2 to balance out the -2 oxidation number of the oxygen atom. Since there are two silver atoms, each silver atom must have an oxidation number of +1 to yield a total oxidation number of +2 for the compound.

In Ag2O, the silver atoms lose one electron each to form Ag+ ions. This results in an oxidation number of +1 for each silver atom. The oxygen atom gains two electrons from the silver atoms to achieve a stable octet configuration, resulting in an oxidation number of -2 for the oxygen atom. The compound Ag2O is formed through the transfer of electrons, with each silver atom exhibiting an oxidation number of +1.

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It's never a good idea to use your credit card when experiencing strong emotions, especially if you tend to steer toward 'retail therapy.

Amobarbital (like all barbiturates) works by being incontestible to the GABAA receptor at either the alpha or the beta subunit.

Amobarbital (like all barbiturates) works by binding to the GABAA receptor at either the alpha or the beta subunit. These are compulsory sites that are distinct from GABA itself and also distinct from the benzodiazepine binding site.

Amobarbital is a barbiturate classified as having a halfway duration of action, meaning that the effects of the drug can last from 4-6 amobarbital increases the effects of benazepril by apparatus: pharmacodynamic synergism.

So we can conclude that Amobarbital, 5-ethyl-5-isoamyl barbituric acid like all barbiturates.

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Answer:

8.92 g / cm3

Explanation: d = mass / volume

volume = 8.4 x 5.5 x 4.6 = 212.52

1896 / 212.52 = 8.92 g / cm3

STEP-BY-STEP EXPLANATION:

Given parameters

The mass of CO2 = 44.6 grams

To find the volume, we need to find the mole of CO2 first

The formula for calculating mole is given below as

The molar mass of CO2 can be calculated using the formula unit

Mass of carbon = 12 u

Mass of oxygen = 16 u

Molar mass of CO2 = 12 + 2(16)

Molar mass of CO2 = 12 + 32

Molar mass of CO2 = 44 g/mol

Substituting the above parameters into the mole formula

Answer:

True

Explanation:

this was on one of my quizziz

H2SO4 is known as sulfuric acid.

It is a strong oxacid acid.

HNO3(aq) is known as nitric acid.

It is a strong oxacid acid.

HCl is known as hydrochloric acid.

It is also a strong but hydracid acid.

Answer: 4

Explanation: because the zero doesn't count

The incorrect option for the weak nuclear force is it is a repellent force. The correct option is A.

The weak interaction, also known as the weak force or weak nuclear force, is a fundamental force of nature that governs the decay of unstable subatomic particles like mesons and initiates the nuclear fusion reaction that powers the Sun.

Thus, the correct option is A. it is a repellent force.

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The percentage of red glass beads would be = 16.67%

Percentage is defined as the part of a portion of a value per 100 and it is represented by the symbol %.

The number of red colored glass beads = 25

The total number of glass beads = 150

The percentage of glass beads that are red colored glass would be;

= 25/150×100

= 2500/150

= 16.67%

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The chemical formula of a combination that provides the quantities (ratios) of the elements contained in the complex but not the actual numbers or order of atoms is known as an empirical formula. This would be the elemental compound's lowest whole integer percentage.

The empirical formula of a chemical substance in chemistry is the simplest whole number quantity of atoms contained in the product. [1] As an illustration, the empirical formula of sulfur monoxide, or SO, is merely SO, as is the empirical formula of disulfur dioxide, S2O2.

Thus, sulfur monoxide and disulfur dioxide, both sulfur and oxygen molecules, have the same empirical formula. Their molecular formulas, which describe the amount of atoms in each molecule of a chemical substance, are, however, not identical.

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Answer:

2

Explanation:

The volume of gas inside the balloon is 98.5 L.

Applying the ideal gas law,

PV = nRT

where R is the universal gas constant.

To solve for the volume V, we need to rearrange this equation to isolate V:

V = nRT/P

We are given the pressure (P), number of moles of gas (n), and temperature (T), so we can plug these values into the equation and solve for V:

V = nRT/P

V = (3.40 mol)(0.08206 L·atm/mol·K)(17+273.15 K)/(0.800 atm)

V = 98.5 L

Therefore, the volume of gas inside the balloon is 98.5 L.

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The order of reaction is defined as the power to which the concentration of the reactants are raised in the rate equation of the reaction.

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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The volume of medication required for 75 gallons is 30 mL.

The correct procedure for determining the volume of a medication powder that is 1 gram / 100gallons of water required to treat a 75 gallon aquarium is the procedure which ensures that the answer expressed in the proper units.

The required concentration of the medication is 1 gram / 100gallons of water.

Volume of water to be be treated is 75 gallon.

1 g of the medication is dissolved in 40 mL of water.

Therefore, 40 mL of the medication contains 1 g of the medication powder.

40 mL of the medication will treat 100 gallons of water.

Volume of medication required for 75 gallons will be:

Volume of medication required for 75 gallons = 40 mL * 1 g/ 100 gallons * 75 gallons

Volume of medication required for 75 gallons = 30 mL

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Only reactions B and C would be spontaneous at 298 K.

Spontaneous reactions are reactions that occur naturally and do not require external energy input to proceed. This can be determined by calculating the Gibbs free energy of the reaction at a given temperature and pressure. Gibbs free energy can be calculated using the equation ΔG = ΔH - TΔS, where ΔH is the enthalpy change of the reaction, ΔS is the entropy change of the reaction, T is the temperature in Kelvin, and ΔG is the change in free energy of the reaction.
A spontaneous reaction will have a negative ΔG, meaning that the reaction is exergonic and releases energy. Therefore, the products of the reaction are more stable than the reactants. If ΔG is positive, the reaction is endergonic and requires energy input to proceed.
In order to determine which of the following reactions would be spontaneous at 298 K, we must calculate the ΔG of each reaction and determine if it is positive or negative. The reactions are:
A. 2H2O(l) → 2H2(g) + O2(g) ΔH = 484 kJ/mol, ΔS = 69.9 J/K mol
B. CO2(g) + H2(g) → CO(g) + H2O(g) ΔH = 41 kJ/mol, ΔS = -102.6 J/K mol
C. Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l) ΔH = -850 kJ/mol, ΔS = -243 J/K mol
To calculate ΔG at 298 K, we will use the equation ΔG = ΔH - TΔS. The temperature in Kelvin is 298 K, or 25°C.
A. ΔG = (484,000 J/mol) - (298 K) x (69.9 J/K mol) = +4165 J/mol (positive, non-spontaneous)
B. ΔG = (41,000 J/mol) - (298 K) x (-102.6 J/K mol) = -2874 J/mol (negative, spontaneous)
C. ΔG = (-850,000 J/mol) - (298 K) x (-243 J/K mol) = -42600 J/mol (negative, spontaneous)

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Answer:

D. Sweat evaporates from your skin

Explanation:

A physical change is a reversible process, no new substance is formed. A physical change does not affect the chemical composition of a substance.

Sweat evaporation from the skin is a physical change, because the change that occur is merely a change of state, Liquid to Gaseous state, no new substance is formed.

The atomic mass of element A, given that the first isotope has abundance of 18.18% and a mass of 147.99, is 131.43 amu

From the question given above, the following data were obtained:

The atomic mass of the element A can be obtain as illustrated below:

Atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100]

Inputting the given parameters, we have:

Atomic mass = [(147.99 × 18.18) / 100] + [(127.76 × 81.82) / 100]

Atomic mass = 26.90 + 104.53

Atomic mass = 131.43 amu

Thus, the atomic mass of element A obtained from the above calaculation is 131.43 amu

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Answer:

pH value of HCL = 2.69897

Explanation:

Given:

Concentration of HCL = 0.002 M

Find:

pH value of HCL

Computation:

pH value of HCL = - log(Concentration of HCL)

pH value of HCL = - log(0.002)

pH value of HCL = 2.69897

Answer:

D Biomass produces no radioactive waste

Explanation:

Answer:

None are empirical formulas

Explanation:

All are actual compounds. An example of an empirical formula could be CH2O, the empirical formula for carbohydrates like glucose (C6H12O6).

An acid–base titration is a method of quantitative analysis for determining the concentration of an acid or base by exactly neutralizing it with a standard solution of base or acid having known concentration. A pH indicator is used to monitor the progress of the acid–base reaction.

There is no change in the concentration of the reactants or the products.

When a reversible process reaches equilibrium,

The forward reaction rate is the same as the backward reaction rate.

The quantity of product being formed is therefore equal to the quantity of reactant being formed in a given amount of time.

Therefore, for a reversible reaction at equilibrium, both the reactant concentration and the product concentration are constant.

Indicators can be used to roughly determine the equivalence point of an acid-base titration as this colour shift only happens over a narrow pH range.

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The principle behind the acid-base titration is that at the equivalence point , is where the no. of moles of the OH⁻ and H⁺ is equals. . indicator is the dye that color depends on the acidity or the basicity of solution.

The principles in which the acid - base titration is based on is that at the equivalence point the number of the moles of the OH⁻  ions and the number of moles of the  H⁺ both are equals. in the neutralization reactions the acid and the base will react and form the salt and the water.

An indicator is the dye or the chemical substances the will indicates the nature of the acidic and the basic solution.

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