At what temperature would 2.10 moles of Nitrogen gas have a pressure of 1.25 atm and in a 25.0 L tank? (Hint: R = 0.082 L atm K−1 mol−1)

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Answer:

0.75M Fe²⁺

Explanation:

First, we need to balance the redox reaction in acidic medium. Then, we can obtain moles of KMnO4 and with the reaction moles and molarity of the Fe²⁺ solution:

Redox Balance:

Fe²⁺ → Fe³⁺ + 1e⁻

5e⁻ + 8H⁺ + MnO₄⁻ → Mn²⁺ + 4H₂O

___________________________

5Fe²⁺ + 5e⁻ + 8H⁺ + MnO₄⁻ → 5Fe³⁺ + 5e⁻ + Mn²⁺ + 4H₂O

Moles of KMnO₄:

70.0mL = 0.0700L * (0.150mol / L) = 0.0105 moles KMnO₄

Moles and molarity Fe²⁺:

0.0105 moles KMnO₄ * (5 moles Fe²⁺ / 1mol KMnO₄) = 0.0525 moles Fe²⁺

In 70.0mL = 0.0700L:

0.0525 moles Fe²⁺ / 0.0700L =

Answer:

its b alkyne

Explanation:

brinliest po plsss

Answer:

Alkyne so its b

Answer: 8.830418848725065

Explanation:

8.830418848725065

Answer:

Explanation

n = 4

Now,let's find the number of electrons:

\(2 {n}^{2} \)

plug the value

\( = 2 \times {4}^{2} \)

Evaluate the power

\( = 2 \times 16\)

Multiply the numbers

\( = 32\)

Hope this helps...

best regards

Electrons are the sub-particles present in atomic shells. The (Principal Quantum Number) n = 4 shell of the atom can hold 32 electrons in it. Thus, option c is correct.

Principal Quantum Number (n) is defined as the distance of the electron from the nucleus and its energy in the atom. It can also be said to know the position of the electron in the energy level along with the orbital size.

The Principle Quantum Number, n = 4 depicts the fourth shell or energy level of the atom that can hold a specific number of electrons in it.

The electrons present in the shell or the energy level are determined by,

2n²

Here, n = 4

Substituting the values above,

= 2 (4)²

= 2 (16)

= 32

Therefore, the n = 4 energy shell can contain 32 electrons.

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The balanced chemical equation for the combustion of liquid pentene  in oxygen gas to form carbon dioxide gas and water vapor is:

\(C_5H_10 (l) + 8O_2 (g)\) → \(5CO_2 (g) + 5H_2O (g)\)

This equation shows that one molecule of pentene reacts with eight molecules of oxygen gas to produce five molecules of carbon dioxide gas and five molecules of water vapor. The equation is balanced because there are equal numbers of atoms of each element on both sides of the equation.

This combustion reaction is exothermic, which means that it releases heat and light energy. It is also a type of oxidation reaction in which pentene reacts with oxygen gas to form carbon dioxide and water, while the carbon-hydrogen bonds in pentene are broken and replaced by carbon-oxygen and hydrogen-oxygen bonds.

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The reaction between HBr (hydrobromic acid) and water is a typical example of an acid-base reaction, in which an acid reacts with a base to form a salt and water. The reaction is as follows:

\(HBr(aq) + H2O(l) $\rightarrow$ H$_3$O$^+$(aq) + Br$^-$(aq)\)

In this reaction, HBr acts as an acid and donates a proton (H⁺) to the water molecule, which acts as a base and accepts the proton. The \(H_{3}O^{+}\)ion that is formed is known as the hydronium ion, which is a strong acid. The Br⁻ ion that is formed is a weak base, and it remains in solution.

The equation is already balanced, and the state symbols indicate that HBr is in aqueous solution (aq) and water is in liquid form (l), while the products are in aqueous solution. The overall reaction is exothermic and releases heat.

In summary, the reaction between HBr and water results in the formation of hydronium ions (\(H_{3}O^{+}\)) and bromide ions (Br⁻).

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Answer:

2Zn(s) + O2(g)------2Zno

The concentration of the koh solution content loaded when 15.00 ml of 0.500 m h2so4 is titrated with 17.70 ml of potassium hydroxide is 0.848 M (Approx.)

To determine the concentration of the KOH solution when 15.00 mL of 0.500 M H2SO4 is titrated with 17.70 mL of potassium hydroxide, follow these steps:

1. Write the balanced chemical equation: H2SO4 + 2KOH -> K2SO4 + 2H2O

2. Calculate the moles of H2SO4: moles = Molarity × Volume (in liters)
moles_H2SO4 = 0.500 M × 15.00 mL × (1 L / 1000 mL) = 0.0075 moles

3. Determine the moles of KOH: From the balanced equation, 1 mole of H2SO4 reacts with 2 moles of KOH, so
moles_KOH = 2 × moles_H2SO4 = 2 × 0.0075 moles = 0.015 moles

4. Calculate the concentration of KOH: Molarity = moles / Volume (in liters)
M_KOH = 0.015 moles / (17.70 mL × (1 L / 1000 mL)) ≈ 0.848 M

So, by calculating, the concentration of the solution results in approximately 0.848 M.

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Now

Ideal gas equation

\(\\ \rm\Rrightarrow PV=nRT\)

\(\\ \rm\Rrightarrow 112=n(8.314)(398)\)

\(\\ \rm\Rrightarrow n=0.033mol\)

Answer:

\(0.03384\ mol\)

Explanation:

Step 1:  Determine important information

Ideal gas law → \(PV=nRT\)

At the end of the problem statement we can see that the pressure is \(1.0\ atm\).  V is the volume which is given as \(112\ L\).  n is the amount of substance which is what we are trying to find.  R is the ideal gas constant is the same for every problem which is \(8.3145\ J * mol^{-1}*K^{-1}\).  Finally, T is the temperature which is given as \(125\ C\) but we have to convert to kelvins which we get \(398\ K\).

Step 2:  Plug in the information and solve

\(PV=nRT\)

\((1.0\ atm)*(112\ L) = n*(8.3145\ J * mol^{-1}*K^{-1})*(398\ K)\)

\(112=n*(3,309.171)\)

\(\frac{112}{(3,309.171)}=\frac{n*(3,309.171)}{(3,309.171)}\)

\(0.03385\ mol = n\)

Answer: \(0.03384\ mol\)

a) The graph shows that the substance takes longer to boil than to melt. One reason for this is that boiling requires more energy than melting.

b) The heating curve of pure water shows the changes in temperature as water is heated. When water is initially heated, it absorbs heat energy, causing its temperature to rise until it reaches its boiling point.

a. When a substance melts, its particles absorb energy, causing the bonds between them to weaken and eventually break, causing the substance to transition from a solid to a liquid state. However, during boiling, not only must the particles absorb energy to break their bonds, but they must also overcome the pressure of the surrounding atmosphere, which keeps them in their liquid state. This means that boiling requires more energy than melting, which is why it takes longer for a substance to boil than to melt.

b. As water continues to be heated, it undergoes a phase transition from a liquid to a gas, with its temperature remaining constant during this process. Once all of the water has boiled off, the temperature begins to rise again as the energy is absorbed by the container or the surrounding environment.In a heating curve of pure water, the x-axis represents temperature, while the y-axis represents heat energy. The curve starts at the initial temperature of the water, then rises until it reaches the boiling point. At the boiling point, the curve remains horizontal until all of the water has boiled off. After this, the curve rises again, showing the energy absorbed by the container or environment. The curve will be similar to an inverted U-shape, with a flat portion in the middle.

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The common sources that emit VOCs are paint, gasoline, glues/adhesives, iron/steel/tin products, heavy metals.

Organic substances that have a high vapour pressure at room temperature are known as volatile organic compounds (VOCs). Low boiling point and high vapour pressure are related to volatility, which is the proportion of the sample's molecules in the surrounding air.

Along with being pollutants, VOCs are also responsible for smells and perfumes' odour. In order to attract pollinators, protect plants from predators, and even converse among themselves, VOCs are crucial in animal-plant communication. Some VOCs are harmful to the environment or pose a risk to human health. Laws are in place to control anthropogenic VOCs, especially indoors where concentrations are highest. Although the majority of VOCs are not immediately toxic, they may have long-term, chronic health effects. VOCs have been employed in several pharmaceutical products.

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An equilibrium constant is an expression that describes the relative concentrations of reactants and products at equilibrium in a chemical reaction.

Let's write the equilibrium constant expressions K for each reaction in terms of partial pressure (Kp) and concentration (Kc).
a) \(N_2O_4(g) + O_3(g) < ----- > 2 N_2O_5(g) + O_2(g)\)
\(Kp = ((P_{N_2O_5})^2 * P_{O_2}) / (P_{N_2O_4} * P_{O_3})\)
\(Kc = ([N_2O_5]^2 * [O_2]) / ([N_2O_4] * [O_3])\)
b)\(CH_4(g) + CO_2(g) < ----- > 2 CO(g) + 2 H_2(g)\)
\(Kp = ((P_{CO})^2 * (P_{H_2})^2) / (P_{CH_4} * P_{CO_2})\)
\(Kc = ([CO]^2 * [H_2]^2) / ([CH_4] * [CO_2])\)
c) \(C_6H_{12}O_6(s) + 6 O_2(g) < ----- > 6 CO_2(g) + 6 H_2O(g)\)
\(Kp = ((P_{CO_2})^6 * (P_{H_2O})^6) / (P_{O_2})^6\)
\(Kc = ([CO_2]^6 * [H_2O]^6) / [O_2]^6\)
For the last reaction, the solid reactant \(C_6H_{12}O_6\) is not included in the equilibrium expressions because its concentration remains constant throughout the reaction.

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Answer:

B.

a pandemic would be like COVID-19 as it spread world wide

a epidemic would be like Japanese small pox incident because it was mostly in Japan

Answer:

number 1

Explanation:

Answer:

weak bonds break and strong bonds form

Explanation:

An exothermic reaction is a chemical reaction in which heat energy is evolved during the reaction process.

Bond formation requires energy while bond breakage releases energy. More energy is needed for the formation of weak bonds as compared to strong bonds.

Hence, when weak bonds break, they release more energy than needed to make a corresponding strong bond leading to the release of the remaining energy as heat.

The correct option is option B, camouflage the chameleon from predators.

Chameleons belong to the reptile family of the animal kingdom, they are creatures with their own special abilities i.e. they can change the color of their body to match them with the surrounding.

This ability of theirs is very helpful for them to hunt for prey as they can camouflage in the environment the prey doesn't get the chance to recognize them as their potential threat and thus they get attacked. Chameleons generally hunt small insects like butterflies, ants, etc.

Another and the most important use of this ability is to hide from the potential threats or predators of the wild. It helps them to blend in with their environment and avoid detection by predators. For example, if a chameleon is in a green plant, it can change its skin color to green and become nearly invisible to predators.

This adaptation allows the chameleon to survive in its environment by remaining undetected, which is essential for its survival.

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Answer:

As in ratio?

16 and 12 are both divisible by 4 (4x3 = 12 and 4x4 = 16)

Ratio of dogs to cats from 16 : 12 to

4 : 3

Answer:

4/3

Explanation:

have a nice day

Answer: broken down into smaller molecules

Explanation: The proteins, lipids, and polysaccharides that make up most of the food we eat must be broken down into smaller molecules before our cells can use them—either as a source of energy or as building blocks for other molecules.

The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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Answer:

The balanced reaction for the decomposition of baking soda is

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

We can find the heat of reaction by using the Hess' Law. This is done by using this formula:

∑(Hf,products) -∑(Hf,reactants) = Heat of reaction

where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:

NaHCO3: -947.68 kJ/mol

Na2CO3: -1130.94 kJ/mol

CO2: -393.51 kJ/mol

H2O: -241.8 kJ/mol

Applying Hess' Law:

[1(-1130.94) + 1(-241.82)] + 1(-393.51)] - [2(-947.68)] = 129.09 kJ

Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ

Explanation:

please mark me as brainlest

Answer:

Explanation:

The system you provided represents a chemical reaction in which 2 moles of NO gas react with 1 mole of O2 gas to produce 2 moles of NO2 gas while releasing 113.06 kJ of energy. When the system is cooled, it disrupts the equilibrium state, and the system will adjust to reestablish equilibrium.

In this exothermic reaction, the heat is a product (written on the right side of the equation). Cooling the system will cause it to shift in a direction that minimizes the effect of cooling, which means the reaction will shift in the exothermic direction to counteract the decrease in temperature.

To determine the direction of the shift and the changes in concentrations, we can use Le Chatelier's principle, which states that when a system at equilibrium is subjected to a stress, it will respond by shifting in a way that reduces the effect of the stress.

In this case, cooling is the stress applied to the system. To counteract the cooling, the system will shift in the direction that generates heat, which is the forward reaction (from left to right). Therefore, the answer is:

B. The reaction will shift toward the products (right) and decrease the concentrations of NO and O2.

By shifting toward the products, the concentrations of NO and O2 will decrease, while the concentration of NO2 will increase, allowing the reaction to reestablish equilibrium by compensating for the cooling effect.

Answer:

Below

Explanation:

Heterozygous mean a dominant and a recessive gene.

S (dominant) = short needles

s (reccessive) = long needles

Parent 2 S s

Parent 1

S

s

S s

S SS Ss

s Ss ss

For an offspring to have long needles, both alleles have to be s ( recessive allele for long needle) or ss . That's only occurs in 1/4 pairing so the probability is 25%

Answer:

They vibrate about a fixed position

Coal is abundant and cost-effective, providing stable energy.

Coal extraction damages the environment, and burning it releases high levels of CO2 and air pollutants. Oil has high energy density and infrastructure, but its combustion contributes to climate change and spills cause environmental harm.

Natural gas emits less CO2, is versatile, and is abundant, but extraction techniques like fracking can harm ecosystems and water resources. Nuclear power produces large amounts of electricity without CO2 emissions but faces concerns about radioactive waste disposal and safety risks. Biomass is renewable but competes with food production and can release emissions.

Wind, solar, hydro, and geothermal offer renewable sources, but their scalability, intermittency, and land use impacts vary. Per capita, consumption affects the magnitude of their environmental effects.

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2,3-Dichloro-5,6-Dicyanobenzoquinone is abbreviation of DDQ.

A stronger oxidant than 1,4-benzoquinone, DDQ (2,3-dichloro-5,6-dicyanobenzoquinone) is employed as a reagent for oxidative couplings, cyclization processes, and the dehydrogenation of hydroaromatic compounds.

What in chemical chemistry is DDQ?

In dry conditions, the powerful oxidizing quinone DDQ is eternally stable. It is frequently used to create aromatic and,-unsaturated carbonyls from organic molecules as well as to convert activated methylene and hydroxy groups into carbonyl compounds.

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Answer:

2

Explanation:

because hydrogen is a diatomic element, so it can't be just H