Calculate the volume percent of solute in each of the solutions. A solution made by adding 27.7 mL of methyl alcohol to enough water to give 531 mL of solution.

Answer:

Option 3 is the correct approach.

Explanation:

In the given questions, options are not given. Please find the attachment of the complete question.

Some other options in question are not relevant to something like the given situation. So that the option above will be the right one.

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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The presence of an insoluble impurity generally lowers the melting point of a compound.

When an insoluble impurity is introduced into a compound, it disrupts the regular crystal lattice structure of the compound. This disruption reduces the strength of the intermolecular forces holding the compound together, making it easier for the compound to transition from the solid phase to the liquid phase.

The impurity acts as a "defect" in the crystal lattice, creating localized regions with different properties compared to the pure compound. These regions can have lower melting points, and as a result, the overall melting point of the compound is decreased. The impurity molecules interfere with the orderly arrangement of the compound's molecules, making it easier for the compound to overcome the intermolecular forces and transition into the liquid phase.

This effect is known as "melting point depression" or "lowering of the melting point." It is commonly observed in mixtures or impure substances where the presence of insoluble impurities lowers the melting point range compared to the pure compound.

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Answer:

96 m/s.

Explanation:

Distance equals speed x time,

12 x 8, so the distance is 96 m/s.

Answer: 150 km

Explanation:

75 × 2 = 150 km

Answer:

74km per hour can be put in fraction form, 75 (km)/ 1 hour

We need to know how man miles in 2 hours so our fraction will be x (km)/ 2 hours

75/1 = x/2

x= 150 km

Explanation:

The new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

At standard remperature and pressure

To calculate the new volume of the helium gas, we subtsitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

V₂ = P₁V₁T₂ / P₂T₁

V₂ = ( 1.0atm × 0.32L × 425.0K ) / ( 3.50atm × 273.15K )

V₂ = 136LatmK / 956.025atmK

V₂ = 0.14L

V₂ = 1.40×10²mL

Therefore, the new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.

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Answer:

B

Explanation:

The student is not able to move the box in D --> 55N, 0N. Since the net force is 0, it means that no force is being applied. So you will choose answer B from your options.

Hope this helps, thank you !!

The three technologies used to convert biomass energy into heat and electricity are Combustion, Gasification, Anaerobic Digestion.These technologies enable the efficient utilization of biomass resources, reducing reliance on fossil fuels and contributing to renewable energy generation.

Combustion: Biomass combustion is a widely used technology that involves burning biomass materials, such as wood, agricultural residues, or dedicated energy crops, to produce heat and electricity. In this process, biomass is burned in a controlled manner, and the heat generated is used to produce steam, which drives a turbine connected to a generator. The combustion process releases carbon dioxide (CO2), but since biomass is considered a renewable energy source, the CO2 emitted is part of the natural carbon cycle and does not contribute to net greenhouse gas emissions.

Gasification: Biomass gasification is a thermochemical process that converts biomass into a combustible gas known as syngas. The biomass is subjected to high temperatures in a low-oxygen environment, resulting in the production of syngas, which mainly consists of carbon monoxide (CO), hydrogen (H2), and traces of other gases. The syngas can be used directly for heating purposes or for the production of electricity through internal combustion engines, gas turbines, or fuel cells.

Anaerobic Digestion: Anaerobic digestion is a biological process that breaks down biomass, such as animal manure, crop residues, or organic waste, in the absence of oxygen. During the anaerobic digestion process, microorganisms break down the biomass, producing biogas, which is primarily composed of methane (CH4) and carbon dioxide (CO2). The biogas can be combusted to produce heat and electricity, or it can be upgraded to biomethane and injected into the natural gas grid or used as a transportation fuel.

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The diameter of 150 ml container has more space and so its exposed, so it evaporates more quickly in lesser time.

Reason can be described as, 150 mL container is with 12 cm diameter evaporates faster because its surface area is larger and it has more number of water molecules on the surface. So, it has greater vapour pressure than the 75 ml container and the water also evaporates faster due to large surface area and more exposure.  

So, that the vapour pressure occurs between the molecues.

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Answer:

With no sunlight, photosynthesis would stop, but that would only kill some of the plants—there are some larger trees that can survive for decades without it. Within a few days, however, the temperatures would begin to drop, and any humans left on the planet's surface would die soon after.

Explanation:

With no sunlight, photosynthesis would stop, but that would only kill some of the plants—there are some larger trees that can survive for decades without it. Within a few days, however, the temperatures would begin to drop, and any humans left on the planet's surface would die soon after.

Answer: 5 ml

Explanation:

15 Ml minus the 10 the water takes up = volume of the rock

An adjustable-volume micropipette with a range of 0.5-10 μL would be the most accurate for dispensing 125 μL of solution.

What is the micropipette ?

A micropipette is a precision instrument used to accurately measure and transfer very small volumes of liquid, typically between 0.5 µL and 10 mL. It is commonly used in laboratories to prepare samples for chemical analysis and in medical applications to dispense precise amounts of medication. The micropipette is composed of a plunger, a tip, and a cylinder. The plunger is used to draw liquid into the tip, and the cylinder is used to release the liquid. The micropipette is usually operated using a thumbwheel or a push button that controls the plunger. The tip of the micropipette is designed to fit a range of different sized microtubes, allowing for accurate and repeatable transfer of liquids. The micropipette can be calibrated for accuracy, making it an invaluable tool for laboratories that need precise measurements of liquids.

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If you are looking for the highest polyunsaturated fatty acid content, the best option would be liquid safflower oil. Liquid safflower oil is typically higher in polyunsaturated fatty acids compared to margarine made from safflower oil.

Squeezable margarine may contain added ingredients and may not have the same concentration of polyunsaturated fatty acids as pure safflower oil. Therefore, if your goal is to maximize polyunsaturated fatty acid intake, choosing liquid safflower oil would be the preferred option.

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Answer:

survival

Explanation:

Organisms actually compete for food , water and slot but all this things lead to survival . so organisms are actually competing for survival

The main differences in the synthesis of purine and pyrimidine nucleotides -

What are 2 differences between purine and pyrimidine?

What are the structural differences among purines and pyrimidines in DNA and RNA?

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Answer:

Dirty snowballs

Explanation:

Answer: P2O5 is the empirical formula.

Explanation: When given percentages you can assume that many grams of each atom are in the compound. Then you divide grams by the molar mass of each element, giving you moles. Once you have moles, divide by the smaller molar amount, which should give you 1 mol of Phosphorus and 2.5 mol of Oxygen. Then multiply by 2 in order for both moles to be a whole number. This gets you 2 and 5.

Answer:

Under the same conditions and assuming ideal gas behavior, both gases should have the same number of moles. This means the higher the molar mass the denser the gas. Water vapor would be less dense than N2 under the same conditions.

Explanation:

Answer:

mole

Explanation:

is a unit of amount of substance in the International System of Units, defined (since 2019) by fixing the Avogadro constant at the given value. Sometimes, the amount of substance is referred to as the chemical amount

Answer:

1. 0.0500 moles K, 0.0250 moles Cr and 0.1000 moles O.

2. 9.00 moles ammonium ions are present.

Explanation:

1. In 1mol of K2CrO4 there are 2 moles of K, 1 mole of Cr and 4 moles of O.

The moles in 0.0250 moles K2CrO4 are:

0.0250mol * 2 = 0.0500 moles K

0.0250mol * 1 = 0.0250 moles Cr

0.0250mol * 4 = 0.1000 moles O

2. In 1 mole of (NH4)2CO3 there are 2 moles of ammonium ions, NH₄⁺.

In 4,50 moles are:

4.50 moles * 2 = 9.00 moles ammonium ions are present

Answer: 19 grams

Explanation:

percent by mass = (mass of part)/(mass of whole) * 100

this means that in this question, 12 = x/160 * 100, where x is the amount of NaCl.

this means 12/100 = x/160, and thus x = (160)(12/100)=19.2 grams

The closest option is B.

Answer:

Second Option: 19 grams

Explanation:

Total solution weight: 160 grams

percent of NaCl in the solution: 12%

You take these two numbers and multiply them with 12 being over 100:

160 * \(\frac{12}{100}\) = 19.2 grams

and then just round to the nearest whole number: 19 grams

If the battery is defined as the system, the sign on w in part (b) is  w < 0

A battery is a source of electrical energy consisting of one or more electrochemical cells with external terminals [1] to power electrical equipment. When a battery supplies electricity, its positive terminal is the cathode and the negative terminal is the anode.[2] The terminal marked negative is the source of electrons that  flow through the external  circuit to the positive terminal. When the battery is connected to an external electrical load, a redox reaction converts high-energy reactants into low-energy products and the free energy difference is supplied as electrical energy to an external circuit. Historically, the term "battery" specifically referred to devices made up of multiple cells. However, usage has evolved to include devices consisting of a single cell.

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The amount of Tigan that should be given for the post c-section patient is 0.4 ml.The medication Tigan is an antiemetic drug that is commonly used to treat nausea and vomiting. It is available in an injection form, and the concentration is 100 mg/ml. The floor stock is a 5 ml vial of Tigan.

To calculate the number of milliliters that should be administered, use the following formula:Amount needed (mg) / Concentration (mg/ml)

= Volume (ml)0.2 g of Tigan is needed.

1 g is equivalent to 1000 mg. Therefore, 0.2 g is equal to 200 mg.

The concentration of the floor stock is 100 mg/ml.Volume (ml) = Amount needed (mg) / Concentration (mg/ml)Volume (ml)

= 200 mg / 100 mg/mlVolume (ml)

= 2 ml

Since 2 ml is the volume of the solution for 200 mg of Tigan and you only need 0.2 g of Tigan, divide 2 ml by 10, which equals to 0.2 ml (or 0.4 ml rounded to the nearest tenth).

Thus, 0.4 ml of Tigan should be given to the post c-section patient.

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The Henderson-Hasselbalch equation, pH = pKa + log([A]/[HA]), can be used to calculate the pH of a buffer. The equilibrium concentrations of the conjugate acid-base pair used to create the buffer solution are denoted by [HA] and [A] in this equation.

You can alter the pH of the buffer solution by adjusting the acid-to-salt ratio or by using a different acid and one of its salts. Nota bene: Using a very weak acid and one of its salts can result in a buffer solution that is actually alkaline! A pKa value between 6 and 8. The optimal pH for most biochemical experiments is 6-8. The optimal buffering range of a buffer is the dissociation constant for the buffer's weak acid component (pKa) plus or minus one pH unit. If you want to compare one data point (A) to another (B), your formula would be A/B. This means that you are dividing data A by data B. If A is five and B is ten, your ratio will be 5/10. Complete the equation. To calculate your ratio, divide data A by data B.

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The units of the rate constant for this reaction are M^-1 s^-1.

The units for the rate of reaction are determined by the units of the rate constant and the concentrations of the reactants involved in the reaction.

From the given equation, Rate = k[A]^2[B], the units of Rate are:

Rate = k[A]^2[B] = (M^-1 s^-1) x (M^2) x (M) = M/s

where [A] and [B] are the concentrations of reactants A and B respectively, expressed in units of M (moles per liter).

Therefore, the units of rate for this reaction are M/s.

The units of the rate constant (k) can be calculated by rearranging the equation:

Rate = k[A]^2[B]

k = Rate / [A]^2[B]

Substituting the units of Rate and [A] and [B] as M/s and M respectively, we get:

k = (M/s) / (M^2 x M) = M^-1 s^-1

Thus, the units of the rate constant for this reaction are M^-1 s^-1.

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Answer:

5.25yr

Explanation:

I think so

Among all the given reactions, the balanced equation is ¹⁴₆C → ⁰e₋₁  + ¹⁴ N₇.  Therefore, the correct option is option D.

An equation for just a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In other words, all sides of both the reaction have an equal balance of mass and charge.

The ingredients and outcomes of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified. Among all the given reactions, the balanced equation is ¹⁴₆C → ⁰e₋₁  + ¹⁴ N₇.

Therefore, the correct option is option D.

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To ensure that the 9-Fluorenone was totally dry, it had to be washed with methylene chloride. To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.

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Answer:

between electric and magnetic fields is answer

Answer:

Electromagnetic fields travel by transferring energy between electric and magnetic fields.

Explanation:

The electric and magnetic fields are perpendicular to each other and are also perpendicular to the direction of propagation of the wave.