describe where xeriscaping is best implemented and why

Answer: C

Explanation: 3 mol O2 ⇒ 2 mol CO2

O2 reacts to produce 5 mol of CO2 = (3 * 5)/2 = 7.5 mol O2

Answer:

So, the mole ratio between sodium and sodium oxide is 2:1=2

Explanation:

Answer:1 moles Sodium Oxide = 61.97894 gram

Explanation: got it from my teacher

Answer:

0.03 L.

Explanation:

What is given?

Volume 1 (V1) = 0.05 L.

Pressure 1 (P1) = 1.00 atm.

Pressure 2 (P2) = 1.45 atm.

What do we need? Volume 2 (V2).

Step-by-step solution:

To solve a problem when temperature is constant but volume and pressure vary, we use Boyle's Law. Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. The formula of this law is described by this:

We want to know the value of volume 2 (V2), so let's solve for this unknown value and replace the given data:

The final volume would be 0.03 L, as pressure increases, the volume decreases.

Answer:

answer = -0.95

Explanation:

Explanation:

The molar mass of octane (C8H18) is approximately 114 g/mol.

To find the energy required to increase 1 mole of substance by 10°C, we can use the formula:

ΔE = n * C * ΔT

where ΔE is the energy required, n is the number of moles, C is the specific heat, and ΔT is the change in temperature.

For water, n = 1 mol, C = 4.184 J/gK, and ΔT = 10°C.

So, the energy required to increase 1 mole of water by 10°C is:

ΔE_water = n * C_water * ΔT

= 1 mol * 4.184 J/gK * 10 K

= 41.84 J

For octane, n = 1 mol, C = 2.22 J/gK, and ΔT = 10°C.

So, the energy required to increase 1 mole of octane by 10°C is:

ΔE_octane = n * C_octane * ΔT

= 1 mol * 2.22 J/gK * 10 K

= 22.2 J

Therefore, it takes more energy to increase 1 mole of water by 10°C than 1 mole of octane.

Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

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Here are 3 alkali metals with physical and chemical similarity.

What is alkali metals?

alkali metals are come from the fact that when these metals or their oxides dissolved in water.a basic solution results.

Three alkali metals -

1- hydrogen(H)

2-lithium(Li)

3-potassium(K)

Physical and chemical similarity of hydrogen -

-it is colourless and tasteless in nature.

-it is a combustible gas but not a supporter of combustion.

Physical and chemical similarity of lithium -

-it have a melting point of 180.54

-it is the lightest of all metals,with a density approximately half that of water.

Physical and chemical similarity of pottasium -

- this metal is soft and white with a silver lustre.

-it imparts a lavender colour to a flame, and it's vapour is green.

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Answer:

let a real person help u...

The change in internal energy of the system = -772kJ

Explanation:

Heat lost by the system , a = -266KJ

Workdone by the system, W = -506KJ

The first law of thermodynamics states that:

Change in internal energy = q + w

Substituting values into the equation

Change in internal energy = (-266KJ) + (-506KJ)

Change in internal energy = -722KJ

The Density of copper sample is 8.9 g/cm³ to the nearest tenth.

Density is the ratio of the mass of a substance and the volume occupied by that substance.

Density measures how tightly-packed the particles in a substance are.

The more tightly-packed the particles are, the denser the substance will be.

The  formula for calculating the density of a substance is given below as:

Dense substances have smaller volumes but greater masses.

The mass of the copper sample = 39.2 g

The volume of the copper sample = 4.4 cm³

Hence, the density of the copper sample will be:

Density of copper sample = 39.2 g/4.4 cm³

Density of copper sample =8.9 g/cm³

In conclusion, density is a ratio of mass and volume.

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Answer: If a neutral atom gains electrons, then it will become negatively charged

Explanation: If a neutral atom gains electrons, then it will become negatively charged. If a neutral atom loses electrons, then it become positively charged.

Answer:

Overall, energy is released in exothermic and absorbed in endothermic reactions. Therefore, "a" is the correct statement. The other statements are all incorrect.

Explanation:

u suck

The mass of 4.35 moles of potassium chloride is 324.14 grams. Potassium chloride (KCl) is a chemical compound made up of potassium and chlorine.

Potassium chloride (KCl) is a chemical compound composed of potassium and chlorine. It is commonly used as a salt substitute for people on low-sodium diets, as well as a fertilizer, a source of potassium in food additives, and a component of some medical solutions. Potassium chloride can also be used in the production of various chemicals, including explosives and pharmaceuticals.

The molar mass of potassium chloride (KCl) is 74.55 g/mol (39.10 g/mol for K and 35.45 g/mol for Cl).

To calculate the mass of 4.35 moles of KCl, we can use the following formula:

mass = moles × molar mass

So, the mass of 4.35 moles of KCl is:

mass = 4.35 moles × 74.55 g/mol

mass = 324.14 g

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49.18 years long will it take for 15 grams of strontium to decay to 5 grams.

The answer to the question is that strontium 90 degrades at a rate of 2.44% annually.

Therefore, after t years, P quantity of strontium 90 is still present.

assuming P=P0e0.0244t

To determine how long it takes for strontium to break down from 15 grams to 5 grams.Take the equation, enter the numbers, and find the value of t.

P=5grams

P0 = 15 g

5=15e^-0.0244t

5/15=e^-0.0244t

1/3=e^-0.0244t

0.33=e^-0.0244t

Log on both sides, please.

ln(0.33)=ln(e^-0.0244t)

-1.20=-0.0244t

t=-1.20/-0.0244

t=49.18

After 49.18 years 5 grams of strontium will be left.

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The advantage of using telescopes launched into orbit around Earth or sent out into deep space is that the images gathered are usually clearer because they do not have to look through our atmosphere.

What is an atmosphere?

The atmosphere can distort and blur images, making it difficult to observe distant objects with high precision. By placing telescopes in space, scientists can avoid this problem and obtain much clearer and more detailed images of objects in the universe. Additionally, space telescopes can observe a wider range of the electromagnetic spectrum, including ultraviolet and infrared radiation, which are absorbed by Earth's atmosphere.

What is telescopes?

A telescope is an instrument used to observe and study distant objects in space by collecting and focusing electromagnetic radiation. Telescopes can be used to study visible light, infrared radiation, ultraviolet radiation, X-rays, and other forms of electromagnetic radiation. They are important tools in astronomy and have helped scientists make many discoveries about the universe. There are many different types of telescopes, including refracting telescopes, reflecting telescopes, and radio telescopes.

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Two moles or 36 g of water on decomposition gives 32 grams of oxygen gas. Then 494 g of water will give 439.1 g of oxygen.

The decomposition is a type of reaction in which a single compound breaks into its constituent elements or molecules. Water molecules are formed by the combination of hydrogen and oxygen atoms.

Decomposition of two moles of water  decompose to give 2 moles of hydrogen gas and one mole of oxygen gas.

molar mass of water = 18 g/mol

molecular mass of oxygen  = 32 g/mol

Two moles or 36 g of water gives one mole or 32 g of oxygen gas. Then mass of oxygen produced by 494 g of water is :

(494 ×32)/36 g = 439 g

Therefore, 439 g of oxygen gas is formed by the decomposition of 494 g of water.

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Answer:

The answer to these are:

(A) 32

(B) If it is balanced 32

(C) 80

Explanation:

Answer:

Explanation:

# moles that exist in 1.9 X 10 23 =

             =  # of atoms/# of Avogadro 's num

             =    1.9 X 10 23 / 6.02x10 23

              = 0.266 mole of Pb

now we calculate the mass

   mass of lead = # mol x m.wt

                       =    0.266 X 106.4

                       = 28.30 gram

Orbital notation is a way of representing the electronic configuration of an atom, which describes the arrangement of electrons in its various energy levels or orbitals.

In this notation, each orbital is represented by a box or circle, and the electrons are represented by up or down arrows, which indicate their spin. The number and arrangement of boxes and arrows in the notation follow the rules of the Aufbau principle, the Pauli exclusion principle, and Hund's rule.

The Aufbau principle tells that electrons fill the least energy orbitals before filling higher energy orbitals. The first shell of an atom contains one s orbital, which can hold up to two electrons. The s orbital is represented by a single box or circle, and each electron is represented by an up or down arrow.

The electronic configuration for potassium (K) is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹. In orbital notation, this would be represented as 1s: up arrow, down arrow; 2s: up arrow, down arrow; 2p: up arrow, up arrow, up arrow; 3s: up arrow, down arrow; 3p: up arrow, up arrow, up arrow; 4s: up arrow.

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Taking into account the definition of molarity,  the concentration of Na₃PO₄ in solution is 0.192\(\frac{moles}{lliter}\).

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

\(Molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{lliter}\).

Being the molar mass of Na₃PO₄ 163.94 g/mole, that is, the amount of mass that a substance contains in one mole, the amount of moles that contains 23.6 g sample of Na₃PO₄ is calculated as:

\(23.6 gramsx\frac{1 mole}{163.94 grams} = 0.144 moles\)

Then you know:

Replacing in the definition of molarity:

\(Molarity=\frac{0.144 moles}{0.750 L}\)

Solving:

Molarity= 0.192\(\frac{moles}{lliter}\)

Finally, the concentration of Na₃PO₄ in solution is 0.192\(\frac{moles}{lliter}\).

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Answer:

1.85 x 10^ -5

Explanation:

Dietary guidelines suggest 22g of protein per day. If a burger has 17.8% protein, a3 oz. (84 g) of food has the highest amount of protein. For mature women and men .

What is sufficient?

A is adequate to meet a certain need or condition. enough time. a sum of money sufficient to meet their necessities. also: excellent enough: of a good or respectable quality. Children who are growing should receive a sufficient amount of nourishment from the school lunch.

What exactly is nutrition?

It is the process through which the organism consumes food, uses it to produce energy for maintenance, growth, and repair, and then eliminates waste from the body.

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An expression for Henderson's pH of acids and bases are given below-

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

pOH = pKb + log\(\frac{conjugate acid}{base}\)

The Henderson-Hasselbalch equation provides a relationship between the pH of acids (in aqueous solutions) and their pKa (acid dissociation constant). The pH of a buffer solution can be estimated with the help of this equation when the concentration of the acid and its conjugate base, or the base and the corresponding conjugate acid, are known.

The Henderson-Hasselbalch equation fails to predict accurate values for the strong acids and strong bases because it assumes that the concentration of the acid and its conjugate base at chemical equilibrium will remain the same as the formal concentration (the binding of protons to the base is neglected).

Since the Henderson-Hasselbalch equation does not consider the self-dissociation undergone by water, it fails to offer accurate pH values for extremely dilute buffer solutions.

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Conditions that are likely to make the combustion of ethane gas a spontaneous change are any temperature, because combustion of ethane leads to an increase in entropy. Hence the correct option is A.

When ethane undergoes combustion, it reacts with oxygen to produce carbon dioxide and water vapor, which are in a more disordered state than the initial reactants. This results in an increase in the overall entropy of the system, making the process spontaneous.

According to the second law of thermodynamics, a spontaneous process is one that leads to an increase in the entropy of the system and/or the surroundings.

Therefore, regardless of the temperature conditions, the combustion of ethane will always be a spontaneous change because it leads to an increase in entropy. Hence the correct option is A.

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Better temperatures can growth the quantity of water vapor withinside the air, that could growth the probability of precipitation.

Different factors, inclusive of air pressure, wind, and atmospheric instability, additionally play a function withinside the formation of rain, and the connection among temperature and precipitation may be complicated. The temperature of atmospheric gases could have a substantial effect at the manufacturing of rain. The environment is a complicated device that performs a vital function with inside the Earth`s water cycle, which incorporates the system of precipitation, inclusive of rain. Precipitation takes place while water vapor with inside the air condenses into liquid droplets or ice crystals, which fall to the floor as rain, snow, or hail. The temperature of the environment impacts the quantity of water vapor that the air can preserve. As temperature increases, the air can preserve extra water vapor, that could cause better tiers of humidity. When the air will become saturated with water vapor, it reaches its dew point, and the extra water vapor condenses into liquid droplets or ice crystals, that could shape clouds and subsequently precipitation. In addition, international warming, that's inflicting an growth in atmospheric temperatures, can cause modifications in precipitation styles and extra severe climate events. Understanding the connection among temperature and precipitation is vital for predicting and mitigating the affects of weather change.

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