How do the data support your claim above? Explain your statement above.

According to contemporary thermodynamics, heat is the system's overall internal energy. Two properties were defined in order to measure the heat energy related to matter and its relationship to temperature.

The amount of heat needed to raise a substance's temperature by one degree is known as its heat capacity. The entire internal energy of a system is measured in terms of heat energy. Both the system's overall kinetic energy and the molecules' potential energy are included in this.

The heat required is:

q = mc (T₂ - T₁)

50000 = m × 75.3  (1.00 - 20.00)

m = 50000 / 75.3  (1.00 - 20.00)

m = -34.9 = 34.9

Molar mass of water = 18 g/mol

n = 34.9 / 18 = 1.93 mol

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To calculate the percentage of silica in the sandstone rock, we need to first calculate the mass of silica in the sample. We can use the Law of Conservation of Mass to do this. The equation for this law is mass of reactants = mass of products.

In this case, the reactants are 19.5 mg of the sandstone rock and 3.95 mg of carbon dioxide. So the mass of silica in the sample is 19.5 - 3.95 = 15.55 mg.

To calculate the percentage of silica in the rock, we need to divide the mass of silica (15.55 mg) by the total mass of the sample (19.5 mg) and then multiply that by 100. So the percentage of silica in the rock is 15.55/19.5 * 100 = 79.87%.

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The concentration of A decreases and then levels out. Option A

In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.

At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.

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Based on my understanding of the chemical properties of sodium and gold, I would place sodium higher than gold in the activity series.

Sodium is a highly reactive metal that readily loses its outermost electron to form a positively charged ion, whereas gold is a relatively inert metal that does not easily undergo chemical reactions.

As for the second part of the question, hydrochloric acid (HCl) will not react with gold metal to produce gold(III) ions and hydrogen gas. Gold is a noble metal, which means it is resistant to oxidation and does not readily react with acids like HCl. However, aqua regia, a mixture of nitric acid and hydrochloric acid, can dissolve gold by forming complex ions, such as AuCl4-, which are more soluble in water than pure gold metal.

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Answer:

2.481cm³

Explanation:

this is general has equation so the formula is

P1V1/T1 = P2V2/T2

At STP, pressure is 1.01*10⁵ and temperature is 273K

((1.20*10³)400)/(250+273) = ((1.01*10⁵)V2/(273)

V2 = 2.481cm³

Answer:

It can lose it's electrion

Explanation:

One method of making ethanol involves a gas phase process that converts syngas (a mixture of carbon monoxide and hydrogen) into ethanol. This method is also known as the gas-to-liquids (GTL) process.

The GTL process begins with the gasification of biomass or fossil fuels, which produces syngas. The syngas is then cleaned and processed in a series of chemical reactions that convert it into ethanol. The key reactions in this process include the Fischer-Tropsch synthesis and the water-gas shift reaction.
During the Fischer-Tropsch synthesis, the syngas is converted into long-chain hydrocarbons and oxygenates, including ethanol. The water-gas shift reaction is used to adjust the ratio of carbon monoxide to hydrogen in the syngas, which can improve the efficiency of the process.
Once the ethanol has been produced, it is purified and separated from any remaining impurities. The final product is a high-purity ethanol that can be used as a fuel or chemical feedstock.
Overall, the gas phase method for producing ethanol offers several advantages, including the ability to use a wide range of feedstocks and the potential for higher yields than traditional fermentation-based methods. However, the process can be expensive and requires specialized equipment and expertise.

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The pH value of this buffer is 4.04.

A mixture of a weak acid and its conjugated base (here: benzoic acid and sodium benzoate) or a weak base and its conjugated acid is called a buffer. When calculating the pH value of a buffer, we use the Henderson-Hasselbalch equation:

\(pH = pKa+log\frac{[base]}{[acid]}\)

pKa - negative logarithm of acid's acidity constant (for benzoic acid, pKa = 4.19)

[base] - molarity of the basic component (sodium benzoate, NaOBz)

[acid] - molarity of the acidic component (benzoic acid, BzOH)

To calculate pH, we need the molarities of both sodium benzoate and benzoic acid. However, because the volume values for both components are the same, we can actually just use their number of moles (n). We can calculate the number of moles of each component using their mass (m) and molar mass (M):

n = m/M

n(NaOBz) = m(NaOBz) / M(NaOBz)

n(NaOBz) = 2.05 g / 144.11 g/mol

n(NaOBz) = 0.0142 mol

n(BzOH) = m(BzOH) / M(BzOH)

n(BzOH) = 2.47 g / 122.12 g/mol

n(NaOBz) = 0.0202 mol

Now we can plug these values into the equation:

pH = 4.19 + log(0.0142/0.0202)

pH = 4.19 + log(0.703)

pH = 4.19 - 0.15

pH = 4.04

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The bond order of H2 is 1, the bond order of He2 is 0, and the bond order of H2+ is 0.5.

Bond order is the number of bonds between a pair of atoms in a molecule. It is calculated by subtracting the number of anti-bonding electrons from the number of bonding electrons and dividing by two.

For H2, there is one bonding electron pair and no anti-bonding electron pairs, so the bond order is (2-0)/2 = 1.

For He2, there are two bonding electron pairs and two anti-bonding electron pairs, so the bond order is (2-2)/2 = 0.

For H2+, there is one bonding electron pair and one anti-bonding electron pair, so the bond order is (2-1)/2 = 0.5.

The bond order of H2 is 1, the bond order of He2 is 0, and the bond order of H2+ is 0.5.

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Precision comparison: t-test; Increased measurements: Confidence interval would decrease.

In order to compare the precision of two different assays for determining a tumor marker in blood serum, the researcher should use a t-test.

The first assay yields a measured concentration of 20.45±0.06 ng/mL for 10 replicate measurements, while the second assay provides a measured concentration of 21.62±0.13 ng/mL for 10 replicate measurements of the same serum sample.

By conducting a t-test, the researcher can determine if the difference in precision between the two methods falls within the range of experimental error at a specific confidence interval.

As for the second question, if the number of measurements is increased to 10 while the standard deviation remains the same, the confidence interval would decrease, indicating a higher level of precision and a narrower range for the estimated true value of the urine sample containing probenecid.

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Answer:

i am not sure but

Explanation:

b and c should be correct

Answer:b and D

Explanation:

The combustion of butane in oxygen (air) is represented in the  balanced chemical equation as 2 C₄H₁₀ + 13 O₂\(\rightarrow\) 8 CO₂ + 10 H₂O.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Your question is incomplete but most probably your full question was:The combustion of butane in oxygen (air) is represented in the equation 2 C₄H₁₀ + 13 O₂\(\rightarrow\)

Answer:

0.86812566700000000000000

The binomial expansion of (1+2x)^7in ascending power of x is 0.868125.

The algebraic expression (x + y)n can be expanded according to the binomial theorem, which represents it as a sum of terms using separate exponents of the variables x and y.

Each word in a binomial expansion has a coefficient, which is a numerical value. A binomial is a two-term algebraic expression. Examples of binomials include a + b, x - y, and more.

When a binomial is raised to exponents 2 and 3, we can use a set of algebraic identities to determine the expansion. As an illustration, (a + b)2 = a2 + 2ab + b2.

By regrouping and combining like phrases, we can arrange our final response in ascending powers of x by placing the lowest power of x first and the highest power of x last.

Therefore, the binomial expansion of (1+2x)^7in ascending power of x is 0.868125.

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Answer:

116.64 g

Explanation:

74.23÷14 This is # of moles .

# of moles for co = 5.302

Then mass of co2 = 116.64

The complete amino acid sequence of the original polypeptide is Ala-Cys-Leu-Pro-Ser-Trp-Ala-Lys-Trp-Ser-Ser-Leu-Phe-Asp.

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The heat of vaporization (DHovap) of benzene at 298 Kelvin is 33.89 kJ/mol and its vapor pressure is 96 torr.

To calculate Keq at 298 Kelvin, we will use the following equation; Delta G = -RT ln Keq

Where;

ΔG = Gibbs Free Energy

R = Gas constant

T = Temperature

Keq = Equilibrium constant

Given:

DHovap = 33.89 kJ/mo

lT = 298

KPH2O = 96 torr

First, we will convert vapor pressure to atm using the following;1 atm = 760 torrPH2O = 96 torr/760 torr/atm= 0.1263 atm. Now we can calculate ΔG using the following equation;ΔG = DHovap - RT ln(PH2O). Where; R = 8.314 J/mol.K Note that we need to convert kJ to J.1 kJ = 1000 JDHovap = 33.89 kJ/mol = 33.89 x 1000 J/mol DHovap = 33,890 J/molΔG = (33,890 J/mol) - (8.314 J/mol.K)(298 K)ln(0.1263 atm)ΔG = - 20602.88 J/mol. Now, we can solve for Keq by rearranging the equation for ΔG;ΔG = -RT lnKeqKeq = e^(-ΔG/RT)Keq = e^(-(-20602.88 J/mol)/(8.314 J/mol.K)(298 K))Keq = 2.37 x 10^21Answer: The Keq at 298 Kelvin is 2.37 x 10^21.

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A process that may create alpha particles very briefly is Radioactive decay. Radioactive decay is the process by which an unstable atomic nucleus emits alpha particles, beta particles, or gamma rays.

Radioactive decay is the spontaneous process by which unstable atomic nuclei undergo a transformation, releasing energy and particles in the form of radiation. It occurs in certain isotopes, which are variants of elements with different numbers of neutrons in their atomic nuclei.

It can occur naturally or artificially and is used in various fields such as medicine, nuclear energy, and geology.

Thus, the radioactive decay is the process that may create alpha particles very briefly. It is a natural process of transformation of an unstable nucleus, which emits alpha particles, beta particles, or gamma rays. Radioactive decay has many applications in various fields, including medicine, nuclear energy, and geology.

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Explanation:

Electrovalent bonding

A physical change will occur when boiling water, tea, sugar, and ice are combined to form sweet iced tea.

A physical change is a change affecting the form of a chemical substance, but not its chemical composition.

The characteristics of some physical changes are as follows:

According to this question, one makes a glass of refreshing sweet iced tea by combining boiling water, tea, sugar, and ice on a hot summer day. The resulting solution is an example of a mixture, which contains constituents that retain their individual identity.

This suggests that the change is a physical change because there is no formation of a new substance.

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Answer:

For example, the compound FeSO4 is called iron(II) sulfate, because it contains Fe2+.

Explanation:

please mark me as brainliest thank you

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{8.94 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.850498\)

We have the final answer as

Hope this helps you

Answer:

P = 795.77 Mpa

Explanation:

Given that,

Force exerted by the hammer, F = 10⁴ N

The nail can be considered as a circle with radius of \(2\times 10^{-3}\ m\)

We need to find the pressure exerted on the wall. Pressure is equal to force acting per unit area. So

\(P=\dfrac{F}{A}\\\\P=\dfrac{10^4\ N}{\pi \times (2\times 10^{-3})^2}\\\\P=795774715.45\ Pa\)

We know that, 1 MPa = 1000000 Pa

So, P = 795.77 Mpa

So, the pressure exerted on the wall is 795.77 Mpa.

Answer:

1440

Explanation:

32 cans/bundle and there are 45 bundles 32 x 45 = 1440

Answer: clay, silt, sand, pebble, cobble, and boulder.

Answer:.

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 2.45 mL

density = 4.255g/mL

We have

mass = 2.45 × 4.255 = 10.42475

We have the final answer as

Hope this helps you

Answer:

Particles move faster the farther they are apart, so the container with the most spread out particles.

The empirical formula of the compound with 79.9 mass % carbon is CH₃H₉.

What is empirical formula?

The empirical formula of a compound is the simplest, most reduced ratio of the atoms present in the compound. It represents the relative number of atoms of each element in the compound, without providing information about the actual number of atoms or the molecular structure.

1. Determine the mass of carbon in 100 grams of the compound:

Mass of carbon = 79.9% * 100g = 79.9g

2. Determine the mass of hydrogen in 100 grams of the compound:

Mass of hydrogen = (100% - 79.9%) * 100g = 20.1g

3. Calculate the number of moles of carbon:

Number of moles of carbon = Mass of carbon / atomic mass of carbon

Number of moles of carbon = 79.9g / 12.01 g/mol ≈ 6.659 mol

4. Calculate the number of moles of hydrogen:

Number of moles of hydrogen = Mass of hydrogen / atomic mass of hydrogen

Number of moles of hydrogen = 20.1g / 1.008 g/mol ≈ 19.92 mol

5. Determine the empirical formula by dividing the number of moles by the smallest number of moles obtained:

Ratio of carbon to hydrogen ≈ 6.659 mol / 6.659 mol : 19.92 mol / 6.659 mol ≈ 1 : 2.993

Rounding the ratio to the nearest whole number gives us the empirical formula:

Empirical formula: CH₃

To determine the molar mass of the empirical formula, we need to sum up the atomic masses:

Molar mass ofCH₃ = (112.01) + (31.008) = 15.03 g/mol

Finally, to find the molecular formula with a molar mass of 45.12 g/mol, divide the molar mass of the empirical formula into the desired molar mass:

Molecular formula: (45.12 g/mol) / (15.03 g/mol) = 2.999 ≈ 3

Therefore, the empirical formula would be (CH₃H₃), which is CH₃H₉.

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