What is the number of moles of a gas inside a 2.7L airbag at a temperature of 421K and pressure of 6.2atm?

In the event that there is too much solvent present, the solution can become too diluted for crystals to form.

Hence, the phone you're using must be hot and boiling for crystallisation to take place or for crystals to form. The solvent's boiling point should be between 50 and 120 °C. Impurities should either be insoluble in the hot solvent or soluble in the cool solvent.

There must be no interaction of the drug or solvent. The solvent's boiling point needs to be lower than the compound's melting point. The purified substance shouldn't react with a good recrystallization solvent; instead, it should dissolve somewhat at high temperatures and significantly at low temperatures.

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Answer: Water is SUPER soluble and regarded as an universal solvent because it is polar in nature and dissolves most inorganic solutes and some polar organic solutes to form aqueous solutions.

Explanation:

WATER is a substance which is composed of the elements such as hydrogen and oxygen that are combined in the ratio of 2:1. The physical properties of water include:

--> it is a colourless, odourless and tasteless liquid and

--> the boiling point of water is 100°C(this is due to the presence of hydrogen bonding).

The solubility of a solute in a solvent at a particular temperature is the maximum amount of solute in moles or grams that will saturate 1000 dm³ or grams of the solvent.

Water is regarded as a universal solvent BECAUSE it is capable of dissolving many substances. This solubility helps maintain different processes in life such as acting as the solvent which helps cells transport and use substances like oxygen or nutrients.

Answer:

8

Explanation:

trust

Answer:

e

Explanation:

Answer:

A      20

B      40

C      Ca

D      10

E       9

F      F

Explanation:

Considering the definition of calorimetry, if 200.0 g of ice absorb 1255.0 J of heat, the temperature change is 2.988°C.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change). So, the amount of heat that a body receives or transmits is determined by the following expression:

Q = c×m×ΔT

Where:

In this case:

Replacing in the definition of calorimetry:

1255 J = 2.1 J/gC× 200 g× ΔT

Solving:

1255 J ÷(2.1 J/gC× 200 g)= ΔT

2.988 °C= ΔT

Finally, the temperature change is 2.988°C.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

a pH above 7 is alkali

a pH lower than 7 is acidic

The mass of the iron oxide produced in the given chemical reaction is equal to 27.04 grams.

The limiting reagent in a chemical reaction can be described as that reactant that will decide the amount of the yield of the product. The reactant consumed first will confirm the completion of the reaction if the reactants are not taken in stoichiometry.

Given the chemical reaction of the formation of iron oxide:

4Fe   +    3O₂    →    2Fe₂O₃

Given the mass of the iron = 15.4 grams

The moles of the iron = 15.4/56 = 0.275 mol

The mass of the oxygen gas = 3.6 grams

The moles of the oxygen gas = 3.6 /32 = 0.1125 mol

From the chemical equation, 4 moles of the Fe react with oxygen = 3 mol

Then 0.275 mol of the Fe will react with oxygen = 3/4 × 0.275 = 0.206 mol

Therefore, oxygen is the limiting reagent here.

The 3 mols of oxygen produced iron oxide = 2 mol

0.1124 mol of oxygen will produce iron oxide = (2/3) × 0.1125 = 27.04 g

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The statement you provided refers to the determination of the van't Hoff factor (i) for strong electrolytes. The van't Hoff factor represents the number of ions produced per mole of solute dissolved in a solution.

For example, when calcium chloride (CaCl2) dissolves, it dissociates into three ions: one Ca2+ ion and two Cl- ions. Therefore, the van't Hoff factor (i) for CaCl2 is 3 because it produces three ions per mole of solute dissolved.

Similarly, when ammonium phosphate (NH4)3PO4 dissolves, it dissociates into four ions: three NH4+ ions and one PO43- ion. Thus, the van't Hoff factor (i) for (NH4)3PO4 is 4 because it yields four ions per mole of solute dissolved.

The van't Hoff factor is essential in various calculations related to colligative properties, such as boiling point elevation and freezing point depression, where it is used to account for the number of particles in solution.

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If a solution of acetic acid (a weak acid) is titrated with NaOH (a strong base) solution, the pH at the equivalence point will be higher than 7. The correct option is A.

Acetic acid reacts with NaOH in a neutralization reaction to form sodium acetate and water. At the equivalence point, all the acetic acid has reacted with the NaOH to form sodium acetate, and the solution contains only the conjugate base of acetic acid (acetate ion) and sodium ions. The pH of this solution will be determined by the dissociation of the sodium acetate, which is a salt of a weak acid and a strong base.

The acetate ion is the conjugate base of a weak acid, and it undergoes hydrolysis in water to produce hydroxide ions (OH-) and acetic acid. This reaction increases the concentration of hydroxide ions in the solution, causing the pH to be higher than 7.

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The answer is product.

The free energy of a thermodynamic system is referred to as the Gibbs free energy or Gibbs energy. The Gibbs free energy is a thermodynamic quantity that represents the thermodynamic system's ability to do reversible work.The formula for Gibbs energy is shown below:

                           ΔG = ΔH - TΔS

where:ΔG: the Gibbs free energy of the system

ΔH: the enthalpy of the systemT: the temperature of the system

ΔS: the entropy of the system

The Gibbs free energy can be calculated using the following formula:

ΔG° = - RT lnK

where:ΔG°: the Gibbs free energy at standard state

R: the gas constant

T: the temperature in kelvins

K: the equilibrium constant

The value of ΔG° determines the direction in which a chemical reaction will proceed. A negative ΔG° means that the reaction is spontaneous, while a positive ΔG° means that the reaction is non-spontaneous.

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Answer: The answer is b for sure

Explanation: Because, I took the test

The mass of C in in the 1.2359 g sample of the compound is 0.612 g.

The mass of carbon in the compound is calculated as follows:

moles of CO₂ in the sample = mass / molar mass

molar mass of CO₂= 44 g/mol

moles of CO₂ in the sample = 2.241  / 44

moles of CO₂ in the sample = 0.051 moles

Moles of C in 1 moles of CO₂=  1 moles

moles of C in the sample = 0.051 moles

mass of C i the sample = moles * molar mass

molar mass of C = 12 g/mol

mass of C in the sample = 0.051 * 12

mass of C in the sample = 0.612 g

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Answer:

H⁣⁣⁣⁣ere's l⁣⁣⁣ink t⁣⁣⁣o t⁣⁣⁣he a⁣⁣⁣nswer:

bittuly/3a8Nt8

Explanation:

According to molar concentration, molarity of the resulting solution is 4.32 molar.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in formula M₁V₁=M₂V₂ gives M₂=6.2×2/3=4.32 M.

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Answer:

There are 24*60 minutes in a day (ignoring the imperfections of the natural world, the Earth and Sun). So there are 24*60 valid 24 hour times (excluding seconds) on a digital clock.

A measure of time representing the interval between consecutive passages of the Sun across the meridian, averaged over one year. 1 day = 24 hr (86,400 sec) and 60 minutes.

hope it helps ya mate! :-P

The new pH of the buffer can be calculated using the following equation:pH = pKa + log([base]/[acid])Where:pKa is the acid dissociation constant for CH3COOH (4.76)[base] is the concentration of CH3COO-[acid] is the concentration of CH3COOHPka = 4.76 [CH3COO-] = 0.050 M [CH3COOH] = 0.050 M + 0.015 M = 0.065 MpH = 4.76 + log(0.050/0.065) = 4.76 - 0.146 = 4.614The pH of the buffer solution is 4.614 after the addition of 0.015 mol of NaOH.

Buffer solutions can resist changes in pH even when an acid or base is added to them. A buffer is prepared by combining a weak acid and a salt of that acid or a weak base and a salt of that base. The buffer is made up of roughly equal amounts of the acid and the salt.When a small amount of acid or base is added to the buffer solution, it reacts with the acid or base present in the buffer to form the salt. As a result, there is little or no change in the buffer solution's pH, which is very useful in a number of laboratory and industrial applications. Calculate the pH of the solution upon the addition of 0.015 mol of NaOH to the original buffer.Here, the question is requesting the pH of a buffer after the addition of NaOH. The initial buffer's pH is 5.2. The buffer is made up of acetic acid (CH3COOH) and sodium acetate (CH3COONa).CH3COOH dissociates in water according to the following reaction:CH3COOH + H2O ⇌ H3O+ + CH3COO-CH3COO- + Na+ ⇌ CH3COONaAdding NaOH will increase the OH- concentration and decrease the H3O+ concentration of the buffer solution. This results in a higher pH. The NaOH reacts with CH3COOH to create CH3COO- and water. The new pH of the buffer can be calculated using the following equation:pH = pKa + log([base]/[acid])Where:pKa is the acid dissociation constant for CH3COOH (4.76)[base] is the concentration of CH3COO-[acid] is the concentration of CH3COOHPka = 4.76 [CH3COO-] = 0.050 M [CH3COOH] = 0.050 M + 0.015 M = 0.065 MpH = 4.76 + log(0.050/0.065) = 4.76 - 0.146 = 4.614The pH of the buffer solution is 4.614 after the addition of 0.015 mol of NaOH.

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The definite integral is 11.93.

We can solve the problem by using the following steps:

Step 1:

Find the value of ∫ b0 f(x)dx by adding up all the areas.

Step 2:

Substitute the areas with their respective values.

Step 3:

Simplify the equation.

Step 4:

Round off the value to the nearest hundredth.

We have:

∫ b0 f(x)dx = Area A + Area B + Area C + Area D

∫ b0 f(x)dx = 1.563 + 2.887 + 5.703 + 1.775

∫ b0 f(x)dx = 11.928 (rounded off to the nearest hundredth)

Therefore, the definite integral is 11.93.

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Answer:

carbon

Explanation: carbon is the answer

The crystalline structure of quartz is due to b. the internal arrangement of atoms within the crystal.

When conditions permit, many minerals form crystals with elaborate geometric patterns. The crystalline structure of quartz is due to

The crystalline structure of quartz is due to b. the internal arrangement of atoms within the crystal.

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Using  Speed, distance and time relation, the distance is 400 kilometers.

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.

The International System of Units defines a metre as the distance unit. It's interesting to note that many other derived units or quantities, such as volume, area, acceleration, and speed, may be constructed using this as the basic unit and a few formulae.

20 kilometers per hour is the speed per half-hour.

⇒ Speed in kilometers per hour: 40 × 2 = 80

Distance x time = speed

Distance = Time × Speed

= 80 × 5

= 400 miles

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The solubility of Cr(OH)₃ at a pH of 11.00 is 4.69 × 10⁻¹⁰ mol/L. at a pH of 11.00 is 4.69 × 10⁻¹⁰ mol/L.

Given that the Ksp of Cr(OH)₃ is 6.70 × 10⁻³¹ at a pH of 11.00.To find the solubility of Cr(OH)₃, we use the expression for the solubility product. It is given as:Ksp = [Cr³⁺][OH⁻]³We know that at a pH of 11, the concentration of OH⁻ ions is 1.0 × 10⁻³ M.

The reaction is given as:Cr(OH)₃(s) ⇌ Cr³⁺(aq) + 3OH⁻(aq)The concentration of Cr³⁺ is the same as the solubility of Cr(OH)₃(s).Let the solubility of Cr(OH)₃ be x. Then, the concentration of Cr³⁺ is x.[OH⁻]³ = Ksp/Cr³⁺(1.0 × 10⁻³)³ = 6.70 × 10⁻³¹/xx = (6.70 × 10⁻³¹/(1.0 × 10⁻³)³)¹∕³= 4.69 × 10⁻¹⁰ mol/LTherefore, the solubility of Cr(OH)₃ at a pH of 11.00 is 4.69 × 10⁻¹⁰ mol/L.

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Answer:

depends...

on how difficult it is

1. B, the energy associated with the motion of an object

2. C, 12.4 g/mL

3. C, 5

1) B) Kinetic energy is energy associated with the motion of an object.

2) B) Density equals mass divided by volume: 1.38 g/mL

3) C) There are 5 significant figures in 20.300

4) A) 80 is the atomic number for mercury on the periodic table.

5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O

So in summary:

• Kinetic energy is the energy of a moving object due to its motion.

• Density is calculated by dividing an object's mass by its volume.

• Significant figures refer to the known precision of a measurement based on the digits reported.

• Atomic symbols represent elements on the periodic table.

• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.

Answer:

0.02L

Explanation:

Using the formula V1/T1 = V2/T2

Given

V1 = 0.5L

T1 = 25 degrees

T2 = 1 degree

V2 =?

Substitute

0.5/25 = V2/1

Cross multiply

25V2 = 0.5

V2 = 0.5/25

V2 = 0.02L

Hence the new volume will be 0.02L

150g•1moles/189.36g= 0.792moles

The resistance = B. 10 Ω

Electric current (symbolized by the letter "i) is the amount of charge flowing in the conductor of each unit of time  

The international standard unit of electric current is Coulomb/second or Ampere (A).  

Electric current is also a ratio between the voltage and the amount of resistance at the conductor.  

Can be formulated  

\(\large{\boxed{\bold{I=\frac{V}{R}}}\)

V = Voltage (volts)  

R = resistance (ohms)  

This formula is also known as Ohm's Law, which states that  

the amount of current flowing is directly proportional to the voltage and inversely proportional to the resistance.  

The current is 1.5 amperes and the voltage is 15-V, so :

\(\tt I=1.5~A\\\\V=15~V\)

The resistance :

\(\tt R=\dfrac{V}{I}\\\\R=\dfrac{15}{1.5}\\\\R=\boxed{\bold{10~ohm}}\)

B) I. Point I will experience the largest electric field because it is closest to the charged wires. The electric field magnitude increases with increasing proximity to the conductors.

The surface known as the equipotential surface is the location of all points at the same potential. A charge can be moved effortlessly from one place on the equipotential surface to another. To put it another way, an equipotential surface is one that has the same electric potential at each point throughout.

Using web technologies, desktop GUI apps can be created using the open-source framework Electron. The Chromium rendering engine and the Node. js runtime are used in its development and maintenance, processing and rendering HTML and CSS.

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The atomic number states the number of protons, so the number of protons in the element silicon is 14.

Atoms are made up of subatomic particles namely protons, electrons and neutrons. In an atom the three particles have a certain amount.

Protons are particles that make up atoms that are positively charged and have a mass as large as that of hydrogen, which is 1.67262 x 10⁻²⁷ kg or 1,836 times heavier than electrons. Protons are so deep in the atomic nucleus that they cannot be disturbed by particles outside the atom.

The element silicon (Si) has an atomic number = 14 and a mass number = 28

So that the number of subatomic particles is:

The number of protons = atomic number

= 14

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