A) balance the equation B) if a bottle of nail polish remover contains 155g of acetone how much heat is released by its complete combustion =-1790kj/mol

pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

To calculate the pH of a solution, we use the formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter.

For [H+] = 1.2 x 10^-2 M:

pH = -log(1.2 x 10^-2) = 1.92

This solution is acidic.

For [H+] = 5.8 x 10^-9 M:

pH = -log(5.8 x 10^-9) = 8.24

This solution is basic.

For [H+] = 3.92 x 10^-12 M:

pH = -log(3.92 x 10^-12) = 11.41

This solution is basic.

For [H+] = 4.52 x 10^-5 M:

pH = -log(4.52 x 10^-5) = 4.34

This solution is acidic.

So, the pH and nature of the solutions are:

pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

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Answer:

iupac

Explanation:

hoped this helped:)

Answer: $582.47

Explanation:

Convert $4.64 per lb to $ per gallon. That would equal around $37.10. Multiply that by 15.70 gallons of strawberries and you'll get $587.47.

15.70 gallons of strawberries would cost approximately $365.40.

To determine the cost of 15.70 gallons of strawberries, we need to convert the volume from gallons to pounds and then multiply by the cost per pound.

First, we need to know the conversion factor between gallons and pounds for strawberries. This conversion factor depends on the density or specific gravity of strawberries, which can vary. Without this information, it is not possible to accurately convert gallons to pounds.

If we assume an average conversion factor of 1 gallon of strawberries weighing approximately 5 pounds, we can estimate the cost. However, please note that this is an approximation and the actual weight of strawberries per gallon may vary.

15.70 gallons * 5 pounds/gallon * $4.64/pound = $365.40

Therefore, based on the approximation, 15.70 gallons of strawberries would cost approximately $365.40.

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The structures are shown in the image attached.

A structural formula is the representation of the molecule in which all atoms and bonds in the molecule are shown.

Since the question requires that all the lone pairs, formal charges and sigma and pi bonds should be shown, then the simple condensed structural formula becomes insufficient in this case.

I have attached images of the structural formula of sodium benzoate (image 1), benzoic acid (image 2)  and tetrahydrofuran (image 3).

All the formal charges, lone pairs as well as sigma and pi bonds are fully shown.

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The correct option for the given question about Buffer Solution is Option B) which is maintains a constant or nearly constant pH when small amounts of strong acids or bases are added.

Thus we conclude that when weak acids or bases are supplied in small amounts, the pH remains steady or almost constant.

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Answer:

\({ \bf{PV = nRT}} \\ { \tt{(4.12 \times 3700) = 3.05 \times 0.083 \times T }} \\ { \tt{15244 = 0.25315 \: T}} \\ { \tt{T = 6.02 \times {10}^{4} \: kelvin }}\)

The temperature of the given gas is  60.95 K when it is occupying 3.70 L at 4.12 atm.

The ideal gas law can be described as a general equation of the state of an ideal gas. This equation gives the relationship between the volume and pressure of one-mole of gas equal to the multiplication of the universal gas constant and temperature.

The mathematical relationship can be shown for the ideal gas equation as:

PV = nRT

Where P is the pressure of the gas, n is the moles, V is the volume of the gas, and R is the gas constant.

Given, the volume of gas, V = 3.70 L

The  pressure of the given gas, P = 4.12 atm

The value of the gas constant, R =0.082 atmL/K mol

The number of moles of the given gas, n = 3.05 mol

Substitute the values V, R, P, and n in the ideal gas equation, and we get:

T = PV/nR

T = 4.12 × 3.70/(0.082 × 3.05)

T = 60.95 K

Therefore, the temperature of the given gas is  60.95 K.

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Answer:

2.77495 moles

Explanation:

Boron= 10.811g (according to periodic table)

\(33g*\frac{1mole}{10.811g B}=2.774951 moles B\)

Answer:

D. A pond freezing over is not a chemical reaction, it is a physical reaction.

The order of events occurring at chemical synapses during paracrine signaling is as follows:

A chemical synopsis is an overview of a particular type of chemical reaction, such as a synthesis or a degradation. It describes the reactants, products, and any other relevant information about the reaction, such as the energy required for it to occur and any catalysts that can be used to speed it up.

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The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of HF is 28grams.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

H\(_2\) + F\(_2\) → 2HF

Mass of  H\(_2\)=8Grams

mass of F\(_2\)= 20grams

According to law of conservation f mass

mass of H\(_2\) + mass of F\(_2\)   = mass of HF

Substituting all the given values, we get

8grams + 20grams =mass of HF

mass of HF=28grams

Therefore the mass of HF is 28grams.

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Answer:

Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…

Explanation:

Specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.

Spectral lines are produced when the electrons undergoes transitions within atoms or ions. When the electrons move far or near to nucleus of any atom, radiation of particular wavelength is emitted or absorbed.

These emitted light is represented as they are moving from one state to the another.

Thus, specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.

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The pressure 0.75 atm to mmHg is 570 mmHg. Option C.

Since most barometers use mercury as the liquid the height of the liquid is often used as a measure of pressure. Therefore, millimeters of mercury or centimeters of mercury are sometimes used as units of pressure. KPa is an abbreviation for kilopascal, which is the pressure applied to a surface.

Calculation:-

1 atm = 760 MM of Hg

0.75 atm = 0.75 × 760

= 570 MM of Hg

KPa is widely used internationally as a unit of pressure and is also used for example to measure air pressure in car tires. The three methods of measuring pressure are absolute, gage and differential. Absolute pressure refers to the pressure in a vacuum while gauge pressure and differential pressure refer to other pressures such as the ambient atmospheric pressure or the pressure of an adjacent vessel.

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The climatic change in Earth's history that has resulted in glaciers is the cold climate.

During the last 2.6 million years, the Earth has experienced a series of ice ages, or periods of colder global climate, which have led to the growth of glaciers in regions with sufficient snowfall.

These colder periods are associated with changes in the Earth's orbit, tilt, and precession, which affect the amount and distribution of solar radiation received by the Earth. These climatic changes have had significant impacts on the Earth's surface and have influenced the evolution of life on our planet.

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Explanation:

Gregor Mendel knew how to keep things simple. In Mendel's work on pea plants, each gene came in just two different versions, or alleles, and these alleles had a nice, clear-cut dominance relationship (with the dominant allele fully overriding the recessive allele to determine the plant's appearance

Answer:

the number of moles is 6

Explanation:

The computation of the number of moles is given below:

According to the question

Since 2 mol of KI produces 1 mol of PbI2

based on the above information  

The number of moles would be  

8 mol will produce 6 mol of PbI2

Therefore the number of moles is 6

Hence, the same is considered and relevant too

The other things would be ingored

Answer:

158.033944 g/mol

Explanation:

Answer:

\(T_2=400K\)

Explanation:

Hello there!

In this case, according to the given information for this question, it turns out possible for us to calculate the final temperature, after the expansion process, by using the well-known Charles' gas law:

\(\frac{T_2}{V_2}=\frac{T_1}{V_1}\)

Thus, we solve for the final temperature to obtain:

\(T_2=\frac{T_1V_2}{V_1}\)

And plug in the given values:

\(T_2=\frac{100K*20.0L}{5.00L}\\\\T_2=400K\)

Regards!

Answer:

I d o nt have the 254 415 5405

The formula for lithium hydrogen phosphate is Li2HPO4.

What is lithium hydrogen phosphate (Li2HPO4)?

Lithium hydrogen phosphate (Li2HPO4) is a chemical compound that contains the elements lithium, hydrogen, phosphorus, and oxygen. It is an ionic compound and a salt of phosphoric acid.

Lithium hydrogen phosphate is commonly used in the production of lithium-ion batteries and as a source of lithium ions in chemical reactions. It is also used in the synthesis of various other lithium compounds. In addition, lithium hydrogen phosphate has potential applications in the field of biomedical engineering as a material for bone tissue engineering and drug delivery.

What is an ionic compound?

An ionic compound is a type of chemical compound formed by the combination of positively charged ions (called cations) and negatively charged ions (called anions) through electrostatic attraction. The cations and anions are held together by ionic bonds, which are formed by the transfer of electrons from the cation to the anion. Ionic compounds are typically solids at room temperature and have high melting and boiling points. Examples of ionic compounds include sodium chloride (NaCl), magnesium oxide (MgO), and calcium carbonate (CaCO3).

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Answer:

40,113 years

Explanation:

To find the age of the sample, you need to use the half-life formula:

\(N(t)=N_0(\frac{1}{2})^{t/h\)

In this formula:

------> N(t) = current mass (g)

------> N₀ = initial mass (g)

------> t = time passed (yrs)

------> h = half-life (yrs)

You can plug the given values into the equation and rearrange the formula to find "t".

N(t) = 0.781 g                       t = ? yrs

N₀ = 100 g                           h = 5730 yrs

\(N(t)=N_0(\frac{1}{2})^{t/h\)                                           <----- Half-life formula

\(0.781=100(\frac{1}{2})^{t/5730}\)                                     <----- Insert values

\(0.00781=(\frac{1}{2})^{t/5730}\)                                       <----- Divide both sides by 100

\(log_{1/2}(0.00781)=log_{1/2}((\frac{1}{2})^ {t/5730})\)               <----- Take \(log_{1/2}\) of both sides

\(7.00 = \frac{t}{5730}\)                                                   <----- Solve \(log_{1/2}\)

\(40,113 = t\)                                                   <----- Multiply both sides by 5730

The given sample is 40,113 years .

Half-life, in radioactivity, is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.

Half-life formula,

\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)   .......(1)

where,

N(t)=current mass

N₀=initial mass

t=time period

h=half -life

Given,

N(t)=0.781g, t=? yrs, N₀=100g, h=5730 years

\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)

put the values, in ......(1)

0.781=100(1/2) \(t/5730\\\)

log₁/₂(0.00781)=log₁/₂ ( 1/2)\(t/5730\)

7=t/5730

40,113=t

Hence, the given sample is 40,113 years .

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The ideal gas law equation is: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

To determine the mass of NaCl that reacted with F2 at 290 K and 1.5 atm, we can rearrange the equation as follows: n = PV/RT. Substituting in the values for P, V, R, and T, we get: n = (1.5 atm)(18.0 L)/(0.0821 atm*L/mol*K)(290 K) = 0.835 mol NaCl.

To determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP (standard temperature and pressure), we would use the same equation but with the values for P, V, R, and T corresponding to STP. At STP, P = 0.987 atm, V = 18 L, R = 0.0821 atm*L/mol*K, and T = 273 K. Therefore, n = (0.987 atm)(18 L)/(0.0821 atm*L/mol*K)(273 K) = 0.792 mol NaCl.

What is Sodium chloride?

Sodium chloride, also known as table salt, is an ionic compound composed of sodium and chloride ions in equal proportions. It is a mineral found naturally in most bodies of water, including sea water, and is widely used as a seasoning and preservative in food.

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Answer:

The ideal gas law equation is: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

To determine the mass of NaCl that reacted with F2 at 290 K and 1.5 atm, we can rearrange the equation as follows: n = PV/RT. Substituting in the values for P, V, R, and T, we get: n = (1.5 atm)(18.0 L)/(0.0821 atm*L/mol*K)(290 K) = 0.835 mol NaCl.

To determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP (standard temperature and pressure), we would use the same equation but with the values for P, V, R, and T corresponding to STP. At STP, P = 0.987 atm, V = 18 L, R = 0.0821 atm*L/mol*K, and T = 273 K. Therefore, n = (0.987 atm)(18 L)/(0.0821 atm*L/mol*K)(273 K) = 0.792 mol NaCl.

Explanation:

Answer:

Explanation:

Formula

% = (dicots/angiosperms) * 100

Givens

angiosperms (total) = 260000

Dicots                      = 195000

Solution

% = (195000/260000) * 100

% = 0.75 * 100

Answer: % = 75% are dicots

Answer:

a) no

b) no

c) yes

d) yes

Explanation:

Answer:

Nicotinamide adenine dinucleotide

Flavin adenine dinucleotide

Explanation:

hope this helps ^^

A typical serving of the juice would provide about 29.8 milligrammes of vitamin C.

Subtract the total amount of iodine drops from the quantity of drops required to produce 1 mg of vitamin C in the reference sample. For instance, if your reference sample needed 2 drops for every 1 mg of vitamin C and your test fruit needed 10 drops of iodine, the equation would be Per ounce of fruit juice, there are 5 mg of vitamin C (10/2=10).

We need to know the volume of a normal serving in order to determine the quantity of vitamin C in the juice. Let's presume that a serving size is 250 mL.

5.45 mg / 45.7 mL = x mg / 250 mL

5.45 mg * 250 mL = 45.7 mL * x

1362.5 mg/mL = 45.7 mL * x

x = 1362.5 mg / 45.7

x = 29.8 mg

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The balanced equation for the reaction between sulfur (S₈) and oxygen (O₂) to form sulfur trioxide (SO₃) is 2S₈ + 16O₂ → 16SO₃.

Balancing chemical equations involves the addition of stoichiometric coefficients to the reactants and products.

The balanced equation for the reaction between sulfur (S₈) and oxygen (O₂) to form sulfur trioxide (SO₃) is determined as;

2S₈ + 16O₂ → 16SO₃

From the reactants side we can see that sulfur is 16 and also 16 in the product side. The number of oxygen in the reactant side is 32 and also 32 in the product side.

Thus, the balanced equation for the reaction between sulfur (S₈) and oxygen (O₂) to form sulfur trioxide (SO₃) is 2S₈ + 16O₂ → 16SO₃.

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The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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Answer:

0.86

Explanation:

1mol of Zn has mass of 65.39g.The amount of Zn is 2.5g65.39g/mol=0.038mol.

The amount of H2 produced is the same as the amount of Zn consumed (0.038mol).

1mol of ideal gas will occupy 22.4L at STP.

The H2 will occupy 0.038mol×22.4L/mol=0.86L

.