calculate the mass percent of hoch2ch2oh in a solution made by dissolving 3.2 g of hoch2ch2oh in 43.5g of water.

2,8,1

Explanation:

the atomic number of sodim is 11 so when we deal with configration it will be like 2,8,1

Answer:

About 95.81%

Explanation:

Often quantities grow or decay proportional to their size like decay of radioactive material

In those cases, we use the next formula:

[tex]y=Ce^{kt}[/tex]

where:

y: The amount of radioactive radium

t: Time

k: The decay constant

C: The initial amount of radium

"the half life of radioactive radium" - [tex]\frac{1}{2}C[/tex]

[tex]y=Ce^{kt}\\\\\frac{1}{2} C=Ce^{k*1620}\\\\\frac{1}{2} =e^{1620k}\\\\ln(\frac{1}{2})=ln(e^{1620k})\\\\ln(\frac{1}{2}) = 1620k\:ln(e)\\\\1620k=ln(\frac{1}{2})\\\\k=\frac{ln(\frac{1}{2})}{1620}\\ \\k=-4.2786862997527488\times 10^{-4}\\[/tex]

What percent of a present amount of radioactive radium will remain after 100 years (t)?

[tex]y=Ce^{kt}\\\\y=Ce^{-4.2786862997527488\times10^{-4}*100}\\\\y=0.9581155781885929\:C\\\\\%=y*100\\\%=0.9581155781885929\:C*100\\\%=95.81155781885929[/tex]

To write the net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and perchloric acid are combined, first perform the complete ionic equation and then identify and eliminate the ions that do not participate.

A net ionic equation shows only the chemical species involved in the reaction

A net ionic equation is written with the smallest possible integer values as stoichiometric coefficients.

HClO4 (l) + NaOH (aq) → NaClO4 (aq) + H2O (l)

H+(aq) + OH−(aq) → H2O(l)

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The molar concentration of H3O in a cola that has ph of 2.670 is 7.33×10−4M  

what is phosphoric acid?

Orthophosphoric acid, Mono phosphoric acid, or phosphoric(V) acid are all names for phosphoric acid, an inorganic solid that contains phosphorus and has the formula H 3PO 4. It is typically found as an 85% aqueous solution, which is a non-volatile, colourless, and odourless syrupy liquid.

Since diluted solutions have a tasty acid flavour, they are also employed as food additives in water treatment products as well as in soft drinks and other prepared foods to give them an acidic taste.

In a cola with a pH of 2.670, the following formula can be used to get the molar concentration of [H3O+]:

[H3O+] =10−pH

[H3O+] =10−2.670

[H3O+] =7.33×10−4M

Cola's high phosphoric acid content can interfere with the body's control of bone metabolism and lessen calcium absorption from food when consumed in big quantities. Due to this, those who are at risk of osteoporosis are frequently advised to limit their cola consumption.

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The theoretical yield is 0.205 x 180/144 = 0.256 g, assuming that the salicylic acid is treated with an excess of acetic anhydride or any other acetylating agent.

The stoichiometric ratio is used to compute the moles of aspirin from the moles of the limiting reagent. The value of mass is calculated by multiplying the moles of aspirin by its molar mass. Theoretical yield of the aspirin is the name given to this material.

To calculate the percent yield, it is first essential to ascertain, using stoichiometry, how much of the product should be produced. The greatest quantity of product that may be produced from the specified reactant amounts is known as the theoretical yield.

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Pressure has little effect on the solubility of liquids and solids because they are almost incompressible is true.

The solubility of liquids and solids is mostly unaffected by external pressure. On the other hand, as the partial pressure of the gas above a solution rises, so does the solubility of gases.

Therefore due to variations in pressure, liquids and solids hardly ever vary in solubility. When would be expected, as pressure rises, gases become more soluble. According to Henry's Law, a gas's solubility in a liquid is inversely correlated with its pressure above the solution's surface.

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An ionic compound's two distinct ions separate from one another when it is dissolved in water.

Organic chemicals are typically not ionic. The vast majority of organic compounds have covalent connections. Covalent molecules are not made with ions. They are one molecule when there are no net charges (although may have charge separation).

Compounds of carbon and hydrogen that may or may not also contain other elements are referred to as organic substances. There are also some ionized organic compounds. Cyclopropenyl chloride, as an example. Ionic compounds conduct electricity due to the presence of ions in their aqueous state. The majority of organic materials, however, do not dissolve in water. But other compounds do dissolve easily, such as ethyl alcohol. As one can see, the terms "ionic" and "organic" are not equivalent or even mutually exclusive. In terms of organic and inorganic, respectively, ionic and covalent are equivalent notions. Both organic and inorganic compounds can be in ionic or covalent states. There would only be a broad distinction between organic and ionic if covalent and inorganic were assumed for organic and ionic for inorganic, respectively. Therefore, the decision would be between ionic and covalent molecules.

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Half-life of 2 hours means the concentration of the Ambien in your blood stream drops by half.

Half-life are distinguishing characteristics of the many types of unstable atomic nuclei and the specific manner in which they decay. Compared to gamma decay, alpha and beta decay are typically slower processes. For alpha decay, half-lives can start at roughly one one millionth of a second and for beta decay, they can start as low as one hundredth of a second. Although a wide range of half-lives for gamma emission have been observed, half-lives for gamma decay may be too short to detect (about 10–14 seconds).

For instance, the radioactive isotope cobalt-60, which is utilized in radiotherapy, has a half-life of 5.26 years. After that time, a sample that contained 8 g of cobalt-60 when it was first prepared would now only contain 4 g of the metal and release half as much radiation.

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Cis-1,2-dimethylcyclohexane  conformer always has one axial and one equatorial methyl group is a correct statement.

An isomer of a molecule known as a conformer differs from another isomer by rotating one of the molecule's bonds. An isomer of conformation is also referred to as a conformer. Conformation is the term used to describe the isomers that result. In terms of its methyl (CH3) groups, butane can be divided into three conformers. One of these is an anti conformer, and the other two are gauche conformers. The anti conformer is the most stable of the three. Stereoisomers produced by rotation (twisting) about -bonds are known as conformational isomers (also known as conformers, rotational isomers, or rotamers), and they frequently inter convert quickly at room temperature.

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The final solution has a molarity of 0.652 M. This is derived using the ideal gas equation expression and molarity relation.

Molarity-Molarity (M) is the amount of a substance in a given volume of solution. Molarity is defined as the number of moles of a solute per liter of solution. The molar concentration of a solution is also known as its molarity.

M=n/v

n=moles of solute

v=litres of water

At 33°C and 735 Torr, 12.7 l of argon is dissolved in enough water to yield a final volume of 0.750l.

P = 735.0 torr

= (735.0/760) atm.

= 0.9671 atm.

V = 12.7 L

T = 33.0 o C

= (33.0+273) K

= 306 k

using ideal gas equation

P * V = n*R*T

0.9671 atm. * 12.7 L = n * 0.08206 atm. L/mole . K * 306 K

 n = 0.4891 mole

using molarity formula,

Molarity = number of mole / final volume

= 0.4891 mole / 0.750 L

= 0.652 M (resulting solution)

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This reaction is catalyzed by an enzyme called a hydrolase, and it takes place in a matrix.

By converting l-arginine to l-ornithine and urea, the ureohydrolase arginase, an enzyme that contains manganese, catalyzes the last stage in the urea cycle to get rid of harmful ammonia.

It is changed by the enzyme arginase into L-ornithine, a building block for polyamines and urea, both of which are necessary for the urea cycle. Arg is a precursor of creatine, which is responsible for Arg catabolism, the production of agmatine, and the synthesis of proteins. Creatine is crucial for the energy metabolism of muscle, neuron, and testicles.

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The mass of sodium bicarbonate (NaHCO3) in their sample is 84.007 g/mol.

To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.

An Alka-Seltzer pill has a sodium bicarbonate content of roughly 1.9 grams (0.22 mol) and a citric acid content of roughly 1.0 grams (0.005 mol). The sodium bicarbonate and citric acid in the tablet interact when the tablet is submerged in water, resulting in sodium citrate in solution and the release of carbon dioxide gas.

Calculation:

Molar mass of NaHCO3,

Molar mass of  NaHCO3 = Molar mass of Na + Molar mass of H + Molar mass of C + 3*(molar mass of O)  

⟹ Molar mass of  NaHCO3  = 22.9897 + 1.00794 + 12.0107 + 47.9982 = 84.00654 g/mol

⟹ Molar mass of  NaHCO3 = 84.007 grams/mol.

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An Alka-Seltzer tablet contains about 1.9 grams (0.22 mol) of sodium bicarbonate and about 1.0 gram (0.005 mol) of citric acid. When the tablet is placed in water, the citric acid reacts with the sodium bicarbonate, producing sodium citrate in solution and releasing carbon dioxide gas.

What is the solution of NaHCO3?

Sodium bicarbonate (NaHCO3) (1 M)

Dissolve 12.6 g of NaHCO3 in 100 mL of H2O. Adjust the volume to 150 mL to yield a final concentration of 1 M. Filter-sterilize the solution, and store it at room temperature.

How can you tell how much Na2CO3 and NaHCO3 are in a mixture?

Na2CO3 and NaHCO3 concentration estimation in a mixture: Weigh the combination precisely at 2.0 g, and then create a distilled water solution in a standard flask of 250 ml. Use phenolphthalein as an indicator while you gradually titrate 25 ml of this solution against regular hydrochloric acid. To concord, repeat (Vp ml).

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Answer: Carbon dioxide (CO‚) is composed of one carbon atom and two oxygen atoms. Therefore, the percent composition of carbon in carbon dioxide is approximately 33.3%.

Explanation:

Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, the solubility of sugar and salt is most affected by temperature.

Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per liter or g/L.

Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule. The solubility of sugar and salt is most affected by temperature. On increasing the temperature, the solubility of sugar increases in a solution.

Therefore, the solubility of sugar and salt is most affected by temperature.

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The mass of the corn oil is 39.002 g.

Define density.

The ratio of mass to volume forms the compound measure known as density. The amount of matter per unit volume is measured by density.

Given:

Density of corn oil =  0.88 g/ml

Volume of corn oil = 44.32 ml

Mass= ?

To calculate the mass, density or volume of an object, we use the formula:

Mass = density * volume

where M is the mass,

D is the density, and

V is the volume of an object.

By substituting the values in the above formula, we get

Mass = density * volume

Mass

= 0.88 g/ml* 44.32 ml

= 39.002 g

Therefore, the mass of the corn oil is 39.002 g.

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The iso paraffins have the same hydrogen to carbon ratios as the normal paraffins because to prevent cooking.

What is paraffin?

A complex mixture of hydrocarbons that is derived specifically from the distillates of wood, coal, petroleum, or shale oil and utilized mostly in coating and sealing, candles, rubber compounding, pharmaceuticals, and cosmetics. It is a waxy, crystalline, combustible substance.

What is hydrogen?

The most fundamental member of the chemical element family is hydrogen (H), a colorless, odorless, tasteless, combustible gaseous material.

Therefore, the iso paraffins have the same hydrogen to carbon ratios as the normal paraffins because to prevent cooking.

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The center atom of sulfur tetrafluoride is sp3d hybridized.

Six from the sulfur atom and seven each from the four fluorine atoms will make up the molecule's total of 34 valence electrons.

With each fluorine atom, the sulfur atom will create a single bond. Of the 34 valence electrons, 8 will be accounted for by these bonds. To have a full octet, each fluorine atom needs 3 lone pairs of electrons.

24 valence electrons will be used by these lone pairs, increasing the total number of valence electrons used to 32. The sulfur atom will get the final two electrons as a lone pair.

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The moles of SO₂ are there in 22.4 L of gas at STP is one mole.

According to the ideal gas equation we get :

P V = n R T

given that :

P = pressure of the gas = 1 atm

V = volume of the gas = 22.4 L

n = moles

R = constant = 0.823 atm L / mol K

T = temperature  = 273.15 K

substituting the values we get :

n = P V / R T

n = ( 1 × 22.4 ) / ( 0.823 × 273.15)

n = 1 mol

Thus , moles of  SO₂ gas is 1 mole.

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Answer:

Carbon-12 has 6 neutrons and carbon-14 has 8 neutrons.

Explanation:

Because of the number of neutron they have, they have different physical properties. Carbon-14 is considered an unstable isotope. It decays and emits radioactivity in the form of beta rays.

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Answer:2

Explanation:

8-6=2

₁H, ₂H and ₃H are examples of are isotopes.

Isotopes are  or more styles of atoms that have the same atomic range and role in the periodic desk, and that vary in nucleon numbers due to special numbers of neutrons of their nuclei.

An isotope is certainly one of two or more varieties of the identical chemical detail. Specific isotopes of an element have the equal range of protons in the nucleus, giving them the identical atomic variety, however a specific quantity of neutrons giving every elemental isotope a exceptional atomic weight.

Like the whole lot we see within the world, isotopes are a type of atom, the smallest unit of depend that keeps all the chemical properties of an element. Isotopes are sorts of a chemical detail with precise residences.

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The identity of the gas, given that 3.33 g occupies a volume of 1.365 L at 95 °C and 790 torr is chlorine gas (Cl₂)

First, we shall determine the number of mole of the gas. This is obtained as follow:

PV = nRT

1.039 × 1.365 = n × 0.0821 × 368

Divide both sides by (0.0821 × 368)

n = (1.039 × 1.365) / (0.0821 × 368)

n = 0.0469 mole

Finally, we shall determine the identity of the gas as follow:

Molar mass = mass / mole

Molar mass = 3.33 / 0.0469

Molar mass of gas = 71 g/mol

From the above calculation, we can see that the molar mass of the gas is 71 g/mol.

Thus, we can conclude that the identity of gas is chlorine gas (Cl₂) since:

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Half-life hours N = No[tex](1/2)^{t/half}[/tex]

A radioactive isotope's half-life is the amount of time it takes for it to decay by half. The half-life of a given radioactive isotope is constant, independent of the environment and of the initial concentration of the isotope.

Take into account the following illustration. For instance, consider 100.0 g of 3H. (tritium, a radioactive isotope of hydrogen). It has a half-life of 12.3 years. After 12.3 years, the sample will have deteriorated to 3He by generating a beta particle, leaving just 50.0 g of the original 3H. After an additional 12.3 years, for a total of 24.6 years, the final 25.0 g of 3H will also contain 25.0 g of decomposed 3H.

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Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas 11.2 liters volume of water would be produced by this reaction if of oxygen were consumed.

O2 and HCl react as follows:

2 H2O + 2 Cl2 result from 4 HCl + O2.

Let's say we are given 1 mole of HCl gas. Then, using the equation,

When 89.6 L (4 moles) of HCl interacted, 44.8 L (2 moles) of Cl2 gas was created.

Therefore, X L of Cl2 gas will be produced from 22.4 L (1 mole) of HCl.

For X, the solution is X = (22.4 L 44.8 L) 89.6 L.

X equals 11.2 liters of Cl2 gas

Hence, 11.2 liters volume of water would be produced by this reaction if of oxygen were consumed

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Explanation:

On December 26 2004, waves triggered by a massive earthquake slammed into the coastlines of countries ringing the Indian Ocean. The death toll was enormous. Worldwide, it is estimated that about 230,000 people died that day. Aceh province, on the northern end of the Indonesian island of Sumatra, was hit hardest. There, more than 160,000 people – nearly 5% of the local population – were killed. In the worst hit areas, survivors lost their homes and livelihoods and saw their communities reduced to rubble.

Over the months that followed, governments, religious organisations, NGOs and individual people delivered substantial support for humanitarian assistance and rebuilding. Multi-year reconstruction projects began and Indonesia committed to building back better. Much of what has been learned from that disaster is relevant when considering how the world will recover from the coronavirus pandemic.

In the immediate aftermath of an event like the 2004 tsunami, the path forward is not clear. So how have those from affected regions fared since the day the waves crashed ashore? Over the last 16 years, we have followed people and their families who were living along the coasts of Aceh and Northern Sumatra, the two most northerly provinces in Sumatra, as part of the Study of the Tsunami Aftermath and Recovery (STAR).

Experiences of the disaster and its aftermath, and the meaning people take from them, have varied.

One young man we spoke to lost his wife, child, and 27 other family members in the disaster, but has since remarried. He says that the time since the tsunami has taught him that life sometimes brings happiness and sometimes not, but that affection is critically important.

Another young man who lost a wife and child has also remarried. But he told us that the time since the tsunami has not brought any positive changes in his life, though he is deeply committed to earning the money to support the education of the two young children he now has.

Our data covers the population before the disaster and measures exposure to the disaster in terms of impacts on both places and people. We have been able to measure the disaster’s various impacts on wellbeing and shed light on some of the key drivers for recovery.

Mortality and health

Death is the most extreme consequence of exposure to a disaster. Some deaths are immediate, but others may occur over the years as sustained exposure to stress takes its toll. Teasing out how disasters affect mortality risks is complicated, but can provide clues about what will happen when disasters strike in the future.

We have found that the groups least likely to survive the tsunami were older adults and young children. Among adults, women were less likely to survive than men.

Tracking mortality among survivors in the years after the tsunami provides direct evidence on people’s resilience. We see resilience as the ability to minimise the negative impacts of difficult situations and move forward effectively afterwards. The devastation caused by the tsunami has the potential to “scar” people, resulting in their premature death. But equally, the survivors may have protective traits that are associated with better health and longevity.

We examined mortality for survivors at five years and ten years after the tsunami. We found that among adults, both these factors are in play and that they operate differently for men and women.

Five years after the tsunami, there is clear evidence that for male survivors who were aged 50 and above when the disaster took place, those from heavily affected areas were more likely to still be alive than those from relatively unaffected areas. This shows that over this period, certain protective traits of survivors (perhaps general fitness) appear to exert a stronger effect on longevity than any “scarring” elements of the event.

But for women over 50, the reverse was true: we found that survivors from heavily damaged areas were at higher risk of dying over the next five years than women from unaffected areas.

These basic patterns were still apparent ten years after the disaster. But by this point, the evidence shows that in particular, post-traumatic stress for older men or the loss of a spouse for older women decreased the likelihood them still being alive. Although the two events are of course extremely different, these results should encourage us to reflect on what the long-term health effects of the COVID pandemic might be.

Pressure has little effect on the solubility of liquids and solids because they are almost incompressible True.

Liquids and solids show little change in solubility with changes in pressure. As expected, gases increase in solubility with increasing pressure. Henry's Law states that the solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.

External pressure has little effect on liquid and solid solubility. In contrast, the solubility of a gas increases as the partial pressure of the gas above the solution increases.

Solubility is a measure of the concentration of dissolved gas particles in a liquid and is a function of gas pressure. Increasing the gas pressure increases the number of collisions and increases the solubility, and decreasing the pressure decreases the solubility.

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The half-life formula is used to determine the half-life of a material whose quantity is degrading or decreasing. When a substance degrades, the rate of decay varies depending on the quantity present. [tex]t_{1/2}[/tex]=0.693/λ

Finding the life of a decaying substance is highly challenging since when the substance's quantity decreases, the pace of decay slows down as well. The appropriate metrics to define the life of degrading material are therefore provided by the half-life formula. Let's find solutions to a few examples and learn more about the half-life formula in this part.

A quantity's half-life is the amount of time needed for it to change from its initial value to half, or how long it takes for half of a given sample to react. The speed at which an atom decays radioactively is described by the half-life formula, frequently used in nuclear physics.

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2.20 g (to 3 sig. figs.) the maximum mass of water that could be produced by the chemical reaction. round your answer to significant digits.

hexane is C6H14 or put another way, as in the question CH3(CH2)4CH3. Actually, it is incorrect as depicted in the question.Nonetheless..

2C6H14 + 19O2 ===> 12CO2 + 14H2O ... balanced equation

moled hexane present = 2.6 g x 1 mole/130 g = 0.02 moles

moles O2 present = 5.29 g x 1 mole/32 g = 0.165 moles

Which reactant is limiting? Hexane = 0.02/2 = 0.01; O2 = 0.165/19 = 0.0087

Thus O2 is limiting...

moles of H2O that can be produced =0.165 moles O2 x 14 H2O/19 CO2 = 0.122 moles H2O

Mass of water( H2O) = 0.122 moles x 18 gm/mole = 2.20 g (to 3 sig. figs.)

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The theoretical yield for a reaction is 54.9 g and 51.3 g of product are actually obtained, the percent yield is a 93.4, option (b) is correct.

What is reaction?

One or more chemicals, sometimes referred to as reactants, are changed into one or more new substances, referred to as products, during a chemical reaction.

What is product?

Upon completion of a chemical reaction, a substance is said to be a product. The zinc and sulfur reactants in the equation above mix chemically to create the zinc sulfide product.

% yield = (actual yield/ theoretical yield )  X 100

            = ( 51.3/54.9 ) X 100

            =  93.4

Therefore, the theoretical yield for a reaction is 54.9 g and 51.3 g of product are actually obtained, the percent yield is a 93.4, option (b) is correct.

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