Consider the reaction of glucose with oxygen: C6H12O6(s) + 6O2(g) Right arrow. 6CO2(g) + 6H2O(l)

The enthalpy of formation (Delta.Hf) for C6H12O6(s) is –1,273.02 kJ/mol, Delta.Hf for CO2(g) is –393.5 kJ/mol, and
Delta.Hf for H2O(l) is –285.83 kJ/mol. What is Delta.Hf for O2(g)?

Which equation should be used to calculate Delta.Hrxn for this reaction?
(-393.5kJ/mol + (-285.83 kJ/mol))-(-1,273.02 kJ/mol)
-1,273.02 kJ/mol - ((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol))
((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol)) - (1 mol)(-1,273.02 kJ/mol)

What is Delta.Hrxn for this reaction?

answer: first, third, -2803

The apparent molar mass of the gas is 16.3132 g

Density is the substance's mass consistent with the unit of quantity. The symbol most customarily used for density is ρ, despite the fact that the Latin letter D can also be used. Density is the size of ways tightly a cloth is packed together. it's far defined as the mass consistent with unit quantity.

ρ = m/V, wherein ρ is the density, m is the mass of the item and V is the quantity of the object.

Calculation:-

T =  293.2 K

volume = 4.550 L

mass = 22.436 g

pressure = 0.0750 atm

new mass = 22.837

PV = nRT

PV = mass/molar RT

molar mass =mass RT/PV

                    =   22.837 × 8.314 × 293.2 /0.075 × 4.55 L

                   = 163132 g

The density is of two types, one is absolute density, and the alternative is relative density. Relative density is also called unique gravity, which is the ratio of the density of a material to the density of a reference material. typically, the reference fabric is water.

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Answer:

its b i bet

Explanation:

Answer:

the answer is your a awesome person

Answer:

11.1 moles of CO2

Explanation:

2C2H6(g) + 7O2(g)⟶4CO2(g)+6H2O(g)

To find the number of moles of CO2 produced when 5.55 mol of ethane is burned in an excess of oxygen, use the stoichiometry of the reaction.

5.55 mol C2H6 x (4 mol CO2/2 mol C2H6) = 11.1 mol CO2

Therefore, 5.55 mol of ethane is burned in an excess of oxygen produces 11.1 moles of CO2.

We can be able to determine the amount of toxic lead in the water by thee use of  atomic absorption spectrophotometry.

A toxic metal is known as any metal that is able to affect the health of people. We know that toxic metals are mostly the metals that are in the group of the heavy metals.

Now we know lead as a metal that is able to cause brain damage especially in children. This is why it is very important that there should be a thorough examination in order to know the amount of lead that is present in water.

There are several methods that could be applied in the determination of lead and one of the most common methods is by the use of atomic absorption spectrophotometry which is able to detect even the minutest amount of the led in solution.

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To calculate the time it will take to plate out 1.86 g of chromium metal when a current of 15.0 A is applied to a solution of Cr3+ ions, we can use Faraday's Law of Electrolysis:

This law states that the amount of substance deposited at an electrode during electrolysis is directly proportional to the amount of electric charge that passes through the solution.

t = (1.86 g Cr) / (F * I * n * m)

Where F is Faraday's Constant (96485 C/mol), I is the current (15 A), n is the number of electrons exchanged (3) and m is the molar mass of chromium (52 g/mol).

Substituting the values in place we get

t = 1.86 g / 96485 * 15 * 3 * 52

[The units for a charge, electricity and gram get canceled out and we are left with the unit of time]

Thus giving us a result of t = 1.6 seconds.

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To analyze the tradeoffs of each fuel for this transportation application, we need to compare the energy density, weight, and cost of each fuel and its storage system. We also need to consider the power-to-weight ratio of the car, which determines its performance.

Compressed natural gas has a low energy density, both in terms of mass and volume, compared to gasoline and hydrogen. It requires a large and heavy storage tank to carry enough fuel for a 300-mile journey, which will increase the weight of the car and decrease its power-to-weight ratio. The cost of the storage tank is relatively low compared to hydrogen, but still significant, and the availability of compressed natural gas filling stations is limited.

On the other hand, has a high energy density, both in terms of mass and volume, making it an attractive fuel option. However, it requires a high-pressure storage tank, which is heavier and more expensive than a compressed natural gas tank. Also, the availability of hydrogen filling stations is currently limited, which can be a significant disadvantage.

Gasoline has a moderate energy density, but it is a liquid, making it easy to store and transport. It requires a relatively lightweight and low-cost storage tank, which can fit in a typical car's design. Gasoline is widely available, and its use is well established, making it a convenient option for this application. However, gasoline is a fossil fuel and produces greenhouse gases, making it an environmentally less friendly option compared to hydrogen and natural gas.

Based on the above analysis, we recommend using gasoline for this transportation application. Gasoline has a reasonable energy density, is easy to store and transport, and the cost of its storage tank is relatively low. Also, gasoline is widely available, and its use is well-established. Although hydrogen has a higher energy density than gasoline, it requires a more expensive and heavier storage tank, and its availability is limited. Compressed natural gas has a low energy density and requires a large and heavy storage tank, which is not suitable for this application.

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Answer:

Protons I think. I might be wrong but I think its Protons

Answer:

the nucleus is the center of atoms and its made of of protons and neutrons

Explanation:

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Explanation:

For the moment we have analyzed the physical point of view. For many, the most common way to analyze your body is through the chemical elements.

This increases the number of building blocks to more than four particles, but considering that the number of atoms in a 70 kilogram body is 7,000 quadrillion (you write a 7 followed by 27 zeros), it is still quite simple that we can count the 99.95% of your body weight with only seven elements.

The provocative alternative theories to the Big Bang that state that the universe has no limits

You may have heard that most of our body is water. It may seem unlikely given how solid our bodies feel, but most of you are made of cells filled with water.

There is enough structure that you are unlikely to slide down the drain, but you do have a lot of water. About 60 percent of your body is water, even your bones are roughly 30% water.

Two skeletons sitting on the beach.

IMAGE SOURCE, GETTY IMAGES

Caption,

The bones have 30% water in their composition.

Knowing that water is made up of hydrogen and oxygen (H2O), it seems clear to point out that the elements most present in the body are hydrogen and oxygen.

But there is also much of the most versatile of atoms, carbon. All life we know incorporates water and is based on carbon structures.

Since carbon atoms weigh 12 times more than hydrogen atoms, carbon ranks second by weight behind oxygen.

The thing would be like this: we have 65% oxygen, 18% carbon and 10.2% hydrogen.

If we add a small amount of nitrogen (3.1%), a pinch of calcium for those bones (1.6%), 1.2% of phosphorus, 0.25% of potassium and sulfur and smaller percentages of sodium, magnesium and chlorine, we already reached 99.95

Answer:

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Explanation:

The amount of protons in the nucleus of an element's atom is known as the element's atomic number. It serves to identify and categorize the elements in the periodic table and is particular to each element. The chemical characteristics of an element are determined by its atomic number.

An element's atomic mass is its average atom's mass, which is typically expressed in atomic mass units (amu). It is the total number of protons and neutrons in the nucleus of an atom. The atomic mass can be a decimal and is not always a  number.

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Answer:

ΔG° = ΔH° - TΔS°

ΔG° = 25.22-(201 )(0.08448)

ΔG° = 8.24 kJ/mol

The standard free energy is obtained as 8.2  kJ/mol.

We know that; ΔG° = ΔH° - TΔS° where;

ΔG° = standard free energy

ΔH° = standard enthalpy

T = temperature

ΔS° = standard entropy

Hence substituting the values;

ΔG° =25.22 kJ/mol - (201 K * 84.48 J/mol K)

ΔG° = 25.22 * 10^3 J/mol -   16980.5 J/mol

ΔG° = 8.2  kJ/mol

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Answer:

Explanation:

An element with 70 protons and a mass of 170 would be considered radioactive.

In general, an element with an atomic number (number of protons) greater than 82 tends to be radioactive. Since the element in question has 70 protons, which is less than 82, it does not fall into the category of naturally radioactive elements. However, it is important to note that the stability of an element also depends on the balance between protons and neutrons in the nucleus. Without information about the number of neutrons in the nucleus, we cannot determine the stability of this specific element definitively.

\(\\ \tt\bull\rightarrowtail2 N_2+O_2\longrightarrow 2N_2O\)

Moles of N_2

\(\\ \tt\bull\rightarrowtail \dfrac{48.7}{14}=3.4mol\)

Molar mass of N_2O=44g/mol

Mass of N_2O formed

The mass of nitrous oxide that can be formed from 48.7 g of nitrogen is approximately 76.525 grams. To calculate the mass of nitrous oxide (N₂O) formed from a given mass of nitrogen (N₂), one needs to consider the balanced chemical equation.

N₂+ O₂ -> N₂O

The balanced equation tells us that 1 mole of nitrogen (N₂) reacts with 1 mole of oxygen (O₂) to produce 1 mole of nitrous oxide (N₂O).

Given mass of nitrogen (N₂) = 48.7 g

To find the number of moles of nitrogen (N₂), one divide the given mass by the molar mass of nitrogen, which is approximately 28.02 g/mol.

Number of moles of N₂= 48.7 g / 28.02 g/mol ≈ 1.738 mol

The balanced equation shows that 1 mole of nitrogen (N₂) reacts to form 1 mole of nitrous oxide (N₂O).

So, the number of moles of nitrous oxide (N₂O) formed is also approximately 1.738 mol.

To find the mass of nitrous oxide (N₂O), one multiply the number of moles by its molar mass, which is approximately 44.01 g/mol.

Mass of N₂O = 1.738 mol × 44.01 g/mol ≈ 76.525 g

Therefore, the mass of nitrous oxide formed from 48.7 g of nitrogen is approximately 76.525 grams.

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Given :

A sample of gas occupies 200 L at 780 mm Hg and 280 K.

To Find :

The new volume, in liters, of the gas at 810 mm Hg and 300 K.

Solution :

We know, by ideal gas equation :

\(PV = nRT\)

Since, every thing is constant except \(nR\) .

So,

\(\dfrac{P_1V_1}{T_1} = \dfrac{P_2V_2}{T_2}\)

Putting all given values we get :

\(V_2 = \dfrac{T_2}{T_1}\times \dfrac{P_1}{P_2}\times V_1\\\\V_2 = \dfrac{300}{280}\times \dfrac{780}{810}\times 200\ L\\\\V_2 = 206.35 \ L\)

Therefore, the new volume is 206.35 L.

Answer:

B

Explanation:

Particles in a solid have fixed locations in a volume that does not change. Solids have a definite volume and shape because particles in a solid vibrate around fixed locations.

An increased temperature generally causes a reaction to occur faster rather than slower. Therefore option C is correct.

The increased temperature leads to a higher average kinetic energy of the molecules, which results in more frequent and energetic collisions between the reactant particles.

This increased collision frequency and energy facilitate the breaking of chemical bonds and the formation of new bonds, leading to an accelerated reaction rate.

When the temperature is raised, the kinetic energy of the molecules increases. This means that the individual molecules move faster and possess a greater amount of energy. As a result, the molecules collide more frequently and with higher energy, enhancing the likelihood of successful collisions that lead to a reaction.

In summary, an increased temperature leads to a faster reaction rate by increasing the average kinetic energy of the particles, causing more frequent and energetic collisions.

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Answer:

Burning a match... i'm pretty sure.

Explanation:

All the other are phisical changes while Fire is a chemical reaction.

Answer:

Burning a match is a chemical change.

Explanation:

Burning is defined as the rapid oxidation of a combustible material.

Complete oxidation of the match stick results in an entirely different compound (the ash) while electrons are lost by the wood of the match.

Answer:

The velocity would be if m was meters +1200

Explanation:

im smart

Answer:

Atoms form chemical bonds to satisfy the octet rule and to become stable.

The hypothesis is that these values are the fraction of atoms that are still radioactive after n half-life cycles. A= 0.5, B = 0.25 , C = 0.125, D = 0.015625 and E = 0.00390625.

The term half life of a substance is defined as the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.

"n" represents the number of half lives.

The amount of substance that remains after n half lives can be calculated using the given formula as follows:

So when we have n = 1,

Fraction of substance that remains = 0.5¹ = 0.5.

That means after first half life over, the amount of substance that remains is 0.5 times that of original.

Then, we have A = 0.5

When n = 2, we have 0.5² = 0.25

So, when 2 half lives are over, the amount of substance that remains is 0.25 times that of the original.

Then, B = 0.25

When n = 3, we have 0.5³ = 0.125

So when 3 half lives are over, the amount of substance that remains is 0.125 times that of the original.

Therefore, we have

C = 0.125

When n = 6 , we have

0.5⁶ = 0.015625

So D = 0.015625

When n = 8, we have 0.5⁸ = 0.00390625

Therefore, E = 0.00390625

Thus, the values for A, B, C, D and E are 0.5, 0.25, 0.125, 0.015625 and 0.00390625 respectively.

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Answer:

approximately 60 percent of the energy produced is in the form of heat used to maintain body temperature.

Explanation:

(C:) 84.0 g H2 O

Its the right answer

The mass of the water in the original container by assuming that all heat lost by the copper is gained by the water is 116.23 g.

Mass is the term that told the quantity of a matter.

Given the mass of copper = 110g

The specific heat capacity of copper is 0.20 j/C g

The initial temperature of  copper is 82.4 C

The final temperature of copper and water is 24.9 C

Now, we would determine the mass of the water.

From the formula for sensible heat, ΔH = m × c × ΔT

Where, H = sensed heat,

m = mass,

ΔT = temperature change

Putting the above values in the equation.

ΔH = m × c × ΔT

110 × 0.20 × ( 82.4 - 24.9 ) = mw × 4.186 × (24.9 - 22.3)

1265 J = mw × 10.8836 or mw = 116.23 g

Thus,  the mass of water is 116.23 g.

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The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1, depending on which rate was used to calculate it.

The rate of the reaction is given by the equation:

Rate = -k[A]

where k is the rate constant and [A] is the concentration of the reactant.

Rate at t=140 s:

Rate = (8.00×10−2 M - 0 M) / (140 s - 0 s)

= 5.71×10−4 M/s

Rate at t=400 s:

Rate = (4.00×10−2 M - 0 M) / (400 s - 0 s)

= 1.00×10−4 M/s

Since this is a zero-order reaction, the rate of the reaction is constant, and we can use either rate to calculate the rate constant:

k = Rate / [A]

Using the rate at t=140 s:

k = 5.71×10−4 M/s / 8.00×10−2 M = 7.14×10−3 s−1

Using the rate at t=400 s:

k = 1.00×10−4 M/s / 4.00×10−2 M

= 2.50×10−3 s−1

The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1.

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Answer:

83

Explanation:

3X + 2Y → 5C + 4D

2 moles of Y will produce 5 moles of C

33.0 moles of Y will produce: 33.0 x 5/2 = 82.5 or 83 moles of C

Answer:

D. The temperature remains at 0°C until the change of state is complete.