How many grams are in 2.40 moles of sodium hydroxide (NaOH)?

The molality of a 25.4% (by mass) aqueous solution of phosphoric acid (H₃PO4) is D) 3.47 m.

To calculate the molality of a 25.4% (by mass) aqueous solution of phosphoric acid (H₃PO₄), we can follow these steps:

1. Convert the percentage to mass: Since it is a 25.4% solution, there are 25.4 g of H₃PO₄ in 100 g of the solution.
2. Calculate the mass of the solvent (water): Subtract the mass of H₃PO₄ from the total mass of the solution. 100 g - 25.4 g = 74.6 g of water.
3. Convert the mass of water to kilograms: 74.6 g ÷ 1000 = 0.0746 kg.
4. Determine the molar mass of H₃PO₄: H = 1.01 g/mol, P = 30.97 g/mol, O = 16.00 g/mol. So, (3 × 1.01) + 30.97 + (4 × 16.00) = 97.99 g/mol.
5. Calculate the moles of solute H₃PO₄: 25.4 g ÷ 97.99 g/mol ≈ 0.259 moles.
6. Calculate the molality: Moles of H₃PO₄ ÷ mass of solvent (water) in kg = 0.259 moles ÷ 0.0746 kg ≈ 3.47 m.

Hence, the molality of the 25.4% (by mass) aqueous solution of phosphoric acid (H₃PO₄) is approximately 3.47 m, which corresponds to option D.

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The best buffer in this experiment is the one with the highest buffering capacity, maintaining a stable pH when small amounts of acid or base are added.

To compare the buffer performance in this experiment, you need to evaluate the buffering capacity of each buffer, which is the ability to maintain a stable pH when small amounts of acid or base are added. A higher buffering capacity indicates better performance.

To do this, you can compare the pH changes of each buffer upon addition of the same amounts of acid or base. The buffer with the smallest pH changes demonstrates the highest buffering capacity and is considered the best. Factors that influence buffering capacity include the concentration of the buffer components and the pKa of the buffering agent, which should be close to the desired pH of the buffer solution.

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The buffer in this experiment that can maintain a steady pH when modest quantities of acid or base are introduced has the highest buffering capacity.

The ability of each buffer to maintain a stable pH when tiny additions of acid or base are made is its buffering capacity, which must be assessed in order to compare the buffer performance in this experiment. Better performance is indicated by a larger buffering capacity.

To achieve this, you may evaluate how each buffer's pH changes when the identical amounts of acid or base are added. The buffer that exhibits the least amount of pH change is said to have the maximum buffering capability. The concentration of the buffer components and the pKa of the buffering agent, which should be near to the intended pH of the buffer solution, are factors that affect buffering capacity..

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Answer: Its strength becomes greater.

Explanation:

Just did it

ANSWER

EXPLANATION

Given that

The number of moles lithium bromide is 5.5 moles

Firstly, write a balanced equation for the reaction

Find the number of moles of bromine using stoichiometry ratio

Let x represents the number of bromine

The answers include the following:

This is referred to as the different types of methods which could be natural or artificial and employs the removal of excess water from a certain area or place.

Water in homes is drained through larger pipes which carry it into collection systems so as to prevent the risk of pollution and contamination of other areas.

Grey water path doesn't involve wastewater from the toilet while the black water comes from only the toilet which is why they were chosen as the correct choice.

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It would require approximately 1244.8 joules of energy to heat the 120g cube of lead from 0℃ to 80℃.

Q = m x c x ΔT

Where:

Q is the energy (in joules)

m is the mass of the lead (in grams)

c is the specific heat of lead (in J/g℃)

ΔT is the change in temperature (in ℃)

Given:

Mass of lead (m) = 120g

Specific heat of lead (c) = 0.129 J/g℃

Change in temperature (ΔT) = 80℃ - 0℃ = 80℃

Now, we can substitute these values into the formula:

Q = 120g x 0.129 J/g℃ x 80℃

Q = 1244.8 J

Therefore, the correct answer is 1244.8 joules.

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The carbohydrate characteristic chemical features include all except the all given options. The body converts carbs to glucose.

Molecular sugars make up carbohydrates, or carbs. One of the three primary nutrients included in meals and beverages, together with proteins and fats, is carbohydrate. The primary fuel for your body's cells, tissues, and organs is glucose, also known as blood sugar. In living things, carbohydrates play a variety of functions. Both an energy reserve and structural elements are provided by polysaccharides.

Any material with a known composition is considered to be a chemical. So a chemical always has the same "stuff," to put it another way. Some chemicals like water are found in the natural world. An alteration in a chemical is referred to as a chemical reaction. In a broader sense, a chemical reaction is the process by which one or more compounds transform into one or more new ones.

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Ca3(PO4)2 has a molar mass of 310.18 g/mol.

The sum of the molar masses of a compound's component parts determines its molar mass. The molar masses of calcium, phosphorus, and oxygen must be added up in order to determine the molar mass of Ca3(PO4)2.

The molar mass of calcium is 40.08 g/mol.

The molar mass of phosphorus is 30.97 g/mol.

The molar mass of oxygen is 16.00 g/mol.

There are 3 moles of calcium, 2 moles of phosphorus, and 8 moles of oxygen in the compound Ca3(PO4)2.

As a result, the formula for calculating the compound's molar mass is: 340.08 + 230.97 + 8*16 = 120.24 + 61.94 + 128 = 310.18 g/mol

Consequently, Ca3(PO4)2 has a molar mass of 310.18 g/mol.

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Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.

The energy is the ability to do work.

Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).

The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K

The heat is related to the temperature difference as

Q = m c ∆T

Substitute the values into the expression,

3500 = 28.2 × 0.449 × ∆T

3500 = 12.6618 × (T2 -T1)

T2 - T1 = 276.4220

T2 = 276.4220 K +293 K

T2 = 569.4220K

The temperature of the iron is approximately 570 K.

Thus, the final temperature of the iron in kelvins is 570K.

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When 4.50 grams of methane is burned at constant pressure, approximately 249.56 kJ of heat is released based on thermochemical equation.

To calculate the heat released when burning 4.50 grams of methane at constant pressure, we'll follow these steps:

1. Convert grams of methane to moles
2. Use the given thermochemical equation to determine the heat released per mole of methane
3. Calculate the heat released for the given amount of methane

Step 1: Convert grams of methane to moles
Molar mass of CH4 = (12.01 g/mol C) + (4 × 1.01 g/mol H) = 16.05 g/mol
Moles of CH4 = (4.50 g) / (16.05 g/mol) = 0.2804 mol

Step 2: Determine heat released per mole of methane using the thermochemical equation
ΔH = -890 kJ/mol

Step 3: Calculate the heat released for the given amount of methane
Heat released = (0.2804 mol) × (-890 kJ/mol) = -249.56 kJ

Therefore, when 4.50 grams of methane is burned at constant pressure, approximately 249.56 kJ of heat is released.

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The total pressure of the system is 169.8 kPa (91.3 kPa + 78.5 kPa).

Pressure is the force per unit area applied to an object or system, usually in the form of a gas or liquid, that can cause the system to change shape, deform, or even break. Pressure can be measured in a variety of ways including pounds per square inch (psi), bars, atmospheres (atm), and millibars (mbar). In everyday life, pressure is seen in the form of air pressure, water pressure, and even the pressure of a person's touch.

The total pressure of the system is the sum of the pressure of the hydrogen and the pressure of the water vapor. In this case, the total pressure of the system is 169.8 kPa (91.3 kPa + 78.5 kPa). This pressure is the atmospheric pressure of the system, and it is the pressure that is measured when the hydrogen is collected over water.

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Answer:

14.7°C

Explanation:

Q = m·ΔT·c

ΔT = \(\frac{Q}{m*c}\)

ΔT =\(\frac{1320 J}{230 g* 0.39 J/gC}\)

     = 1320 J / ((230 g) * (.39 J/g°C)

ΔT = 14.7 °C      

Answer:

Homo means same

Hetero means different.

Homogeneous mixtures have one phase, it all looks the same, Fruit juice is homogeneous, solutions are homogeneous.

Heterogeneous mixtures have different phases, you can see the different parts, pepper is an example of a heterogeneous mixture.

In a homogeneous mixture the constituents are able to dissolve in each other due to their similar intermolecular forces, whereas in a heterogeneous mixture the constituents are not miscible- meaning they can't dissolve in each other.

To clarify: intermolecular forces describe the way that types of molecules will interact with each other. For instance, water (a polar molecule) and naphthalene (a non-polar molecule) are said to be "immiscible" because their intermolecular forces do not match. The saying goes: "like dissolves like". Meaning that molecules that have similar IFs will be mutually soluble (miscible, in other words).

Ramelteon is a hypnotic agent used in the treatment of insomnia. The molecular formula of this compound is C16H21NO2.

The molecular formula is the number of elements that are present in a compound. The molecular formula is calculated in terms of the empirical formula since the empirical formula is just the same or a multiple of the molecular formula.

The formula is :

              n=M/mass of the empirical formula

Where,

M is the molar mass and n is an integer.

For example, the molecular formula of Caffeine C8H10N4O2 and its empirical formula is C4H5N2O.

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Answer:

To identify a pure liquid substance using the physical properties of solubility, density, and boiling point. The physical properties of a pure substance can be measured without changing the composition of the substance.

Explanation:

The new temperature (T₂) in the lab = 25.09 °C

Given

V₁=2.15 ml

T₁ = 17 + 273 = 290 K

P = 740.2 mmHg

V₂ = 2.21 ml

Required

The new temperature (T₂)

Solution

Charles's Law

When the gas pressure is kept constant, the gas volume is proportional to the temperature

\(\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\)

Input the value :

T₂=(T₁.V₂)/V₁

T₂=(290 K x 2.21 ml)/2.15 ml

T₂=298.09 K = 25.09 °C

Answer:

The answer is 3.87 J/g°C

Explanation:

Here is the equation we are going to use:

\(C=\frac{q}{mT}\)

C= specfic heat in J/g°C

q = heat in joules (J)

m = mass in grams (g)

T = change in temperature

Here is what is given:

q = 849 J

m = 95.4 g

T = 48.0 - 25.0 = 23°C

Find:

Specific heat capacity in J/g

The first thing we are going to do is plug everything into the equation:

\(C = \frac{849J}{(9.54g)(23degreesC)}\)

Then we are going to solve for C

\(C = \frac{849J}{219.42gC} = 3.87 J/gCelsius\)

Hope this helps!

Answer:

The answer is 3.87 J/gC

Explanation:Reaction Type

Double Displacement (Metathesis)

Net Ionic Equation

Ba(C2O4) + 2K(IO3) = Ba(IO3)2 + K2(C2O4) might be an ionic equation. Calculate the net ionic equation for Ba(C2O4)(s) + 2K(IO3)(aq) = Ba(IO3)2(aq) + K2(C2O4)(aq).

Answer

Explanation

Note: The reaction is a double replacement reaction in which two soluble ionic compounds react in an aqueous solution to form an insoluble solid.

In this case, a solution of sodium carbonate, Na2CO3, will contain

The complete balanced equation that occurs when sodium carbonate is added to hard water is

Answer: a communicable disease

Explanation: key word was transmitted and it was transmitted from a INFECTED living thing and then transmitted to another living thing

Non metals gain electrons and metals loose electrons

Answer:

Explanation:

An element's atomic number defines the amount of protons an element may contain. The atomic number is usually the big number that is shown on top. Therefore, with 17 protons it will always be chlorine. 

The descriptive term applied to the type of diene represented by 2,4-hexadiene is conjugated diene.

Dienes are compounds which contains two double bonds. These dienes can be non conjugated or conjugated.

Conjugated diene are those compound which have two double bonds  joined by a single σ bond. Conjugated dienes can also be called 1,3-diene. To know if diene is conjugated or non conjugated, sp³ hybridization is to b checked and the number of double bonds and single sigma bond is checked.

Conjugated dienes are found in many different molecules. 2,4-hexadiene is a conjugated diene with two carbon-carbon double bonds that are separated by one sigma bond.

The stabilization of dienes by conjugation is better than the aromatic stabilization. Conjugated dienes are more stable than non conjugated or cumulative diene because it has higher electron density of molecules delocalized.

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Answer:

Explanation:

The solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. This relationship is known as Henry's Law. According to Henry's Law, the solubility of the gas in the liquid is given by:

C = k * P

where C is the concentration of the gas in the liquid (in g/L), P is the partial pressure of the gas (in kPa), and k is a constant that depends on the gas and the temperature.

To find the solubility of water at a pressure of 150 kPa, we can use the following equation:

C2 = (P2/P1) * C1

where C1 is the solubility of water at a pressure of 90 kPa (0.13 g/L), P1 is the initial pressure (90 kPa), P2 is the final pressure (150 kPa), and C2 is the solubility of water at a pressure of 150 kPa (which we want to find).

Substituting the values into the equation, we get:

C2 = (150/90) * 0.13 g/L

C2 = 0.217 g/L

Therefore, the solubility of water is 0.217 g/L at a pressure of 150 kPa, assuming the temperature remains constant.

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Jack's most important mistake was that he forgot to purify using the silica plug. As a result, aqueous impurities were not removed and the IR spectrum will show signals from residual water.

Fischer esterification is the process of turning an excess amount of alcohol into an ester of a carboxylic acid while using a powerful acid catalyst. Ester and water are formed together.

RCOOH + R'OHRCOOR' + H2O

In the equation above, 1 mole of acid and 1 mole of alcohol results in 1 mole of ester and 1 mole of water.

The amount of acetic acid used in the experiment was half of what would have favored the reaction. Heating to a constant mass while the solvent is being evaporated would have removed both the alcohol and the solvent. But after using a drying agent, the solution needs to pass through a silica gel plug to get rid of any remaining moisture.

Therefore, Jack's biggest mistake was forgetting to purify using the silica plug. Aqueous contaminants were not eliminated as a result, and the IR spectra will display signals from leftover water.

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Answer:

The preceding temperature is equivalent to approximately 9.6 K => -263.5 °C

Explanation:

Given the provided problem, the formula may be substituted by the corresponding values:

Pressure (P)= 932 mmHg ==> 1.2 atm

Volume (V) = 2,300 mL ==> 2.31 L

Moles (n) = 3.51 moles ==> 3.51 mol

Proportional constant of ideal gas constant: (R) = 0.08206

Therefore, we can equate the following:

T= (PV)

     nR

T= (1.2 atm · 2.31 L)

   (3.51 mol · 0.08206)

T= 9.6 K ==> -263.5 °C

Thus, the cumulative temperature given the substituents/substance is equivalent to -263.5 °C.      

First, let's remember the formula to calculate an object's density:

Then, we analyze what we have:

We need to determine the volume, so we transform our formula like this:

We replace our data:

Then, the answer is that the volume equals 12.4 cm^3.