The chance of recurrence of a polygenic trait based on its known incidence in a particular population refers to continuous variation
Polygenic is a trait that is controlled by a group of non-allelic genes. For example, humans can be many different sizes. Height is a polygenic trait, controlled by at least three genes with six alleles. If you are dominant for all of the alleles for height, then you will be very tall. Skin color is also a polygenic trait, as are hair and eye color. A trait that is controlled by a group of non-allelic genes.
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What is the oxidation number for n in the compound nh3? (recall that h usually has an oxidation number of 1.)
The oxidation number for n in the compound [tex]NH_{3}[/tex] will be -3.
The charge an atom would have if all of its links to other atoms formed fully ionic could be known as the oxidation state, also known as the oxidation number. It describes how much an atom in a chemical molecule has been oxidized. The oxidation state can theoretically be positive, negative, and zero.
The oxidation number of N in [tex]NH_{3}[/tex] will be calculated as:
Let the oxidation number of H is 1.
[tex]NH_{3}[/tex] = 0
x + 3(1) = 0
x = -3.
Therefore, the oxidation number for N in the compound [tex]NH_{3}[/tex] will be -3.
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(c) If both ovaries are removed, how will it affect the female reproductive systems?
If both ovaries are removed, then the individual is unable to produce ovules and experiences menopause.
What are ovaries?The ovaries are two reproductive organs in women which act to generate germinal female cells known as ovules.
The absence of these organs (ovaries) leads to a stage known as menopause and the individual cannot produce sex hormones such as estrogen and progesterone.
In conclusion, if both ovaries are removed, then the individual is unable to produce ovules and experiences menopause.
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What mass of ch4 is consumed when 587. 9 kj of energy is evolved from the combustion of a mixture of ch4(g) and o2(g)? show the set up and answer with unit. ch4 molar mass = 16. 05 g/mol
Mass of CH₄ is 10.591 g.
The molar mass is a crucial characteristic of the material that is independent of sample size. The coherent unit of molar mass in the International System of Units (SI) is kg/mol. However, molar masses are usually generally given in g/mol due to historical considerations.
A chemical compound's molar mass is calculated by dividing its mass by the number of moles of the substance that make up the sample.
Δg = 587.9 KJ
CH₄ Molar mass = 16.05 g/mol
mol CH₄ = Δg / ΔH°
= 587.9 / 890.3 KJ/ mol
= 0.6603 mol CH₄
Mass CH₄ = 0.6603 × 16.05 g/mol
= 10.591 g
Therefore, the mass of CH₄ is 10.591 g.
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Write the equation for the formation of ethyl acetate from ethanol and acetic acid
The equation for the formation of ethyl acetate from ethanol and acetic acid will be [tex]CH_{3} COOH (l) + C_{2} H_{5} OH(l)[/tex] ⇔ [tex]CH_{3} COOC_{2}H_{5} (aq) + H_{2}O (l)[/tex].
When ethanol reacts with acetic acid then it will form ethyl acetate.
Ethyl acetate was created through the esterification reaction between acetic acid and ethanol because once sulphuric acid would be present. Esterification is just the process by which a carboxylic acid reacts with an alcohol to create an ester.
In a chemical process known as acetoacetic ester synthesis, ethyl acetoacetate would be alkylated at the -carbon between both carbonyl groups before being transformed into a ketone, or more precisely, acetone with a -substituted carbon.
Therefore, the equation for the formation of ethyl acetate from ethanol and acetic acid will be [tex]CH_{3} COOH (l) + C_{2} H_{5} OH(l)[/tex] ⇔ [tex]CH_{3} COOC_{2}H_{5} (aq) + H_{2}O (l)[/tex].
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What mass of hydrogen is produced when 192 g of magnesium is reacted with hydrochloric acid?
Answer:
Mg+2HCL-Magnesium Chloride +Hygrogen
[tex] > [/tex]
Explanation:
N.O of moles=Mass\Molar Mass
192÷24=8
1:1
8×2=16
[tex]\huge\underline{\underline{\boxed{\mathbb {SOLUTION:}}}}[/tex]
[tex]\longrightarrow \sf{Mg+2HCI \Longrightarrow MgCl_2+H_2}[/tex]
[tex]\longrightarrow \sf{molMg=129gMg \times \dfrac{1molMg}{24.305gMg=} }[/tex]
[tex]\small \sf{\longrightarrow molH_2=7.90molMg \times \dfrac{1molH_2}{1molMg}= 7.90molH_2 }[/tex]
[tex]\small \sf{\longrightarrow massH_2=7.90H_2 \times \dfrac{2.016g}{1molH_2}= 7.90molH_2= 15.9 \: gH_2}[/tex]
[tex]\huge\underline{\underline{\boxed{\mathbb {ANSWER:}}}}[/tex]
[tex] \small\bm{ The \: mass \: of \:H_2 \: produce \: will \: be \: 15.9 }[/tex] [tex]\bm{grams.}[/tex]
The angle between the hydrogen atoms in water (h2o) is slightly less than expected for a tetrahedral shape. this is because of the:_______.
The angle between the hydrogen atoms in water (h2o) is slightly less than expected for a tetrahedral shape. this is because of the extra electron repulsion from the lone pairs.
A water molecule consists of two hydrogen atoms and one oxygen atom. The three atoms make an angle; the H-O-H angle is approximately 104.5 degrees. The centre of each hydrogen atom is approximately 0.0957 nm from the centre of the oxygen atom.
In water, each hydrogen nucleus is covalently bound to the central oxygen atom by a pair of electrons that are shared between them. In H2O, only two of the six outer-shell electrons of oxygen are used for this purpose, leaving four electrons which are organized into two non-bonding pairs. The four electron pairs surrounding the oxygen tend to arrange themselves as far from each other as possible in order to minimize repulsions between these clouds of negative charge. This would ordinarily result in a tetrahedral geometry in which the angle between electron pairs (and therefore the H-O-H bond angle) is 109.5°. However, because the two non-bonding pairs remain closer to the oxygen atom, these exert a stronger repulsion against the two covalent bonding pairs, effectively pushing the two hydrogen atoms closer together. The result is a distorted tetrahedral arrangement in which the H—O—H angle is 104.5°.
About tetrahedral shape :
In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces.
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A substance moving from an area of high concentration to an area in which it has a low concentration is moving ______ the concentration gradient.
A substance moving from an area of high concentration to an area in which it has a low concentration is moving btween two concentration gradient.
What is diffusion?Diffusion can simply be defined as the movement of substances from a region of a high concentration to a region of lower concentration.
It is also the movement of substances from a region of a strong solution to a region of weak solution.
So therefore, a substance moving from an area of high concentration to an area in which it has a low concentration is moving btween two concentration gradient.
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Which clinical finding represents a contraindication to the administration of nitroglycerin?
Represents a contraindication to the administration of nitroglycerin increased intracranial pressure
Nitroglycerin is a vasodilator that is primarily used to treat anginal chest discomfort. It is now licensed by the FDA for the acute alleviation of an attack or the acute prevention of angina pectoris caused by coronary artery disease.
Nitroglycerin is used to treat coronary artery disease-related angina (chest pain). This medication can also be used to treat an existing angina attack. Nitroglycerin is a common treatment for heart problems. It's the go-to medication for people suffering from angina pectoris, who take it as a sublingual tablet or an oral spray.
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Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
Answer:
Fe(CN)₂, FeCO₃, Pb(CN)₄, Pb(CO₃)₂
Explanation:
Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.
1.) Fe(CN)₂
-----> Fe²⁺ and CN⁻
-----> +2 + (-1) + (-1) = 0
2.) FeCO₃
-----> Fe²⁺ and CO₃²⁻
-----> +2 + (-2) = 0
3.) Pb(CN)₄
-----> Pb⁴⁺ and CN⁻
-----> +4 + (-1) + (-1) + (-1) + (-1) = 0
4.) Pb(CO₃)₂
-----> Pb⁴⁺ and CO₃²⁻
-----> +4 +(-2) + (-2) = 0
Explain the problem surrounding the ammonia-making process in terms of chemical equilibrium.
The main problem is the release of heat and thereby reducing yield of Ammonia.
What is chemical equilibrium?Chemical equilibrium is defined as the state of a reversible chemical reaction where there is no change in net amount of products and reactants involved in it.
What is an exothermic reaction?
Exothermic reaction is one of the chemical reactions that will produces heat during the formation of products.
At the chemical equilibrium, the chemical reaction will be as follows:
[tex]N_{2}[/tex] + 3[tex]H_{2}[/tex] → 2[tex]NH_{3}[/tex] + energy
The above chemical equilibrium equation indicates that energy will be released due to the reaction of nitrogen and hydrogen. The energy release increases the surrounding temperature and thereby it will reduce the yield of the ammonia. Thus it can be indicated as the major problem.
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Serotonin acts as a weak base and has a pkb = 3. 84. what is the ph of a solution made by adding 0. 025 m of serotonin in water?
Serotonin acts as a weak base and has a pkb = 3. 84. The ph of a solution made by adding 0. 025 m of serotonin in water is 2.4.
A molecule called serotonin delivers information between nerve cells in the brain and other parts of the body. Body processes like mood, sleep, digestion, nausea, wound healing, bone health, blood clotting, and sexual desire are all significantly influenced by serotonin.
Tryptophan, an important amino acid, is used to make serotonin. This amino acid, which must be ingested by food, is frequently present in foods including nuts, cheese, and red meat. Lower amounts of serotonin can result from tryptophan insufficiency. Anxiety or depression may come from this, among other mood disorders. The chemical serotonin is essential for elevating mood and lowering anxiety.
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The acid dissociation constant ka for hcn is approximately 1 × 10−9. what is the value of the pkb?
Answer:
pKb = 5
Explanation:
To find the pKb, you need to (1) calculate the pka (using the pKa equation) and then (2) calculate the pKb (using the relationship between the pKa and pKb).
(Step 1)
pKa = -log (Ka)
pKa = -log (1 x 10⁻⁹)
pKa = 9
(Step 2)
pKa + pKb = 14
9 + pKb = 14
pKb = 5
Reaction rate is increased by an increase in kinetic energy
of the reacting particles when their
is _____________
increased
A . Collision theory
B . Surface Area
C . Temperature
D. Concentration
Answer:
Reaction rate is increased by an increase in kinetic energy
of the reacting particles when their
is _temperature_
increased
A . Collision theory
B . Surface Area
C . Temperature
D. Concentration
Drag each tile to the correct location. classify the chemical equations as being balanced or not balanced. 2co 2no → 2co2 n2 6co2 6h2o → c6h12o6 o2 h2co3 → h2o co2 2cu o2 → cuo
A. 2CO + 2NO → 2CO2 + N2 is a balanced equation as the number of carbon, oxygen, and nitrogen atoms are same on both sides.
B. 6CO2 + 6H2O → C6H12O6 + O2 is an imbalanced equation as oxygen atoms are not balanced here.
C. H2CO3 → H2O + CO2 is a balanced equation as same number of hydrogen, carbon, and oxygen are present on both sides.
D. 2Cu + O2 → CuO is an imbalanced equation as both copper and oxygen are imbalanced here.
What is Chemical equation ?A chemical equation is a way to depict a chemical reaction using the symbols and formulas of the components involved. For instance, when zinc metal and diluted sulfuric acid combine, zinc sulphate and hydrogen gas are produced.
Balanced and imbalanced chemical equation -
an equation in chemistry where the number of each sort of atom is equal on both sides. Subscripts are a component of the chemical formulae for the reactants and products that show how many atoms of the previous element there are in each.
The chemical equation is referred to as being imbalanced if the number of atoms of each element present in the reactants and the number of atoms of each element present in the product are not equal.
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Answer: A. 2CO + 2NO → 2CO2 + N2 is a balanced equation as the number of carbon, oxygen, and nitrogen atoms are same on both sides.
B. 6CO2 + 6H2O → C6H12O6 + O2 is an imbalanced equation as oxygen atoms are not balanced here.
C. H2CO3 → H2O + CO2 is a balanced equation as same number of hydrogen, carbon, and oxygen are present on both sides.
D. 2Cu + O2 → CuO is an imbalanced equation as both copper and oxygen are imbalanced here.
What is Chemical equation ?
A chemical equation is a way to depict a chemical reaction using the symbols and formulas of the components involved. For instance, when zinc metal and diluted sulfuric acid combine, zinc sulphate and hydrogen gas are produced.
Balanced and imbalanced chemical equation -
an equation in chemistry where the number of each sort of atom is equal on both sides. Subscripts are a component of the chemical formulae for the reactants and products that show how many atoms of the previous element there are in each.
The chemical equation is referred to as being imbalanced if the number of atoms of each element present in the reactants and the number of atoms of each element present in the product are not equal.
Explanation:
The primary sources of the acidity in acid rain are the gases ________. o3 and vocs o3 and so2 so2 and nox nox and n2o h2so4 and no
The primary sources of acidity in acid rain are the gases SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex] So, the correct option is (c) SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex]
A chemical process that starts when gases like sulphur dioxide and nitrogen oxides are discharged into the atmosphere leads to acid rain. These substances have the ability to ascend very far into the sky, where they combine and react with oxygen, water, and other chemicals to produce acid rain, an additional form of acidic pollution.
Acidic particles corrode metal and hasten the deterioration of paint and stone. Power plants are the primary sources of SO[tex]_{2}[/tex] . Burning fossil fuels produces nitrogen dioxide (like gasoline). Cars, lorries, and power plants are the biggest producers of NO[tex]_{2}[/tex].
Therefore, The primary sources of the acidity in acid rain are the gases SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex].So, the correct option is (c) SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex]
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Dsm-5 includes gambling disorder as an addictive disorder, along with substance use disorders. this change is considered important because it:_________
Dsm-5 includes gambling disorder as an addictive disorder, along with substance use disorders. This change is considered important because it suggest that people may become addicted to behavior net just substance.
What is Gambling ?Gambling disorder which involve repeated, problem gambling behavior. The behavior leads to problem for the individual families, and society.
The emotional and physical sign of gambling disorder are:
Anxiousness and DepressionHopelessnessLack of sleepPallor to skinGain loss of weightWhat are the effects of gambling disorder ?Gambling disorder make another kind of addiction that an individual uses to be able to deal with the situation. Start using the drugs alcohol to reduce the feeling of anxiety.
Thus from the above conclusion we can say that Dsm-5 includes gambling disorder as an addictive disorder, along with substance use disorders. This change is considered important because it suggest that people may become addicted to behavior net just substance.
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In the reaction hc2h3o2 h2o------>c2h3o2 - h3o , which substance is bronted -lowrey base?
In the reaction [tex]HC _{2} H_{3} O_{2} + H_{2}O[/tex]----->[tex]C _{2} H_{3} O_{2}^{-} + H_{3}O^{+}[/tex] , [tex]H_{2}O[/tex] substance is Bronsted -Lowery base.
According to Bronsted-Lowry an acid is a chemical species that is capable of yielding protons and a Bronsted-Lowry base is a chemical species capable of accepting protons .
The Bronsted -Lowery base is any species that can accepts a proton from another molecule . In short Bronsted -Lowery base is proton acceptor ( PA ) and Bronsted -Lowery acid is proton donor ( PD ).
In given reaction , water molecule accept proton from acid . Therfore , it is Bronsted -Lowery base .
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does anyone know the answer to this? is it A?
Answer:
1/2 ( the two answers given are not FRACTIONS)
Explanation:
Moles of CH3OH = 128 gm / 32 gm / mole = 4 moles
Moles of water 72 gm / 18 gm /mole = 4
Mole fraction of CH3OH = 4 / ( 4+4) = 4/8 = 1/2
What is the celsius temperature of 100. 0 g of chlorine gas in a 55. 0-l container at 800 mm hg?
The Celsius temperature of 100. 0 g of chlorine gas is 227.65 C.
What is temperature?
Temperature is the measurement of the hotness or coldness of a body or substance or place.
Given, that the pressure is P = 800 mm Hg
Converted into pascals 1.066 X 10^5 Pa
The Volume is V = 55 l
Converted into meter cube 0.055 m^3
The number of moles of Cl2 gas will be calculated
weight / molecular weight
100.0 / 71 = 1.408
From the ideal gas equation
PV = nRT
T = PV/RT
where R = universal gas constant = 8.314 J /mol K
Putting the values in the equation:
[tex]T = \dfrac{1.006 \times 10^-5 \times 0.055}{1.408 \times 8.314 } = 500.8 K.[/tex]
T is temperature = 500.8 K
The Celsius temperature is 500.8 K = 227.65 C
Thus, the temperature in Celsius is 227.65 C.
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What is the only additional information needed to calculate the empirical formula of a compound if the masses of each element of the compound are provided?
Mass percentages of the the elements in the compound is the only additional information needed to calculate the empirical formula of a compound if the masses of each element of the compound are provided.
What is Empirical Formula ?The Empirical formula is the simplest whole number ratio of atoms present in given compound.
What is Molecular formula of Compound ?Molecular Formula = Empirical Formula × n
n = [tex]\frac{\text{Molar Mass}}{\text{Empirical Formula weight}}[/tex]
Thus from the above conclusion we can say that Mass percentages of the the elements in the compound is the only additional information needed to calculate the empirical formula of a compound if the masses of each element of the compound are provided.
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What set of reaction conditions would favor an sn2 reaction on 2-bromo-3-methylbutane?
The set of reaction conditions would favor a sn2 reaction on 2-bromo-3-methylbutane is a strong nucleophile in an aprotic solvent. The correct option is D.
What is Sn2 reactions?It is a type of nucleophilic substitution reaction. This mechanism is common in organic chemistry. In these reactions, one bond is break and one bond is formed simultaneously.
The sn2 is a nucleophile reaction, and it is a strong nucleophile. This type of reaction, will occur in the compounds in which there is one alkyl halide group and a good leaving group.
In 2-bromo-3-methylbutane, there is a bromine and methyl group both, so the favor would be a strong nucleophile in an aprotic solvent.
Thus, the correct option is D) strong nucleophile in an aprotic solvent.
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The question is incomplete. Your complete question is given below:
A) weak nucleophile in a protic solvent
B) weak nucleophile in an aprotic solvent
C) strong nucleophile in a protic solvent
D) strong nucleophile in an aprotic solvent
E) none of the above
What is the pressure in atm exerted by 1.8 g of H_{2} gas exert in a 4.3 L balloon at 27°C? R =; 0.821(L^ * atm)/(mol^ * K)
Answer:
5.12 atm
Explanation:
Before you can use the Ideal Gas Law to find the pressure, you need to convert grams to moles (via molar mass).
Molar Mass (H₂): 2(1.008 g/mol)
Molar Mass (H₂): 2.016 g/mol
1.8 grams H₂ 1 mole
---------------------- x ---------------------- = 0.893 moles H₂
2.016 grams
The Ideal Gas Law equation looks like this:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas Constant (0.0821 L*atm/mol*K)
-----> T = temperature (K)
After converting Celsius to Kelvin, you can plug the given values into the equation and simplify to find the pressure.
P = ? atm R = 0.0821 L*atm/mol*K
V = 4.3 L T = 27 °C + 273.15 = 300.15 K
n = 0.893 moles
PV = nRT
P(4.3 L) = (0.893 moles)(0.0821 L*atm/mol*K)(300.15 K)
P(4.3 L) = 22.0021
P = 5.12 atm
**Based on my past experiences, I believe the constant (R) you provided may have been mistyped. Instead of 0.821, I used 0.0821.**
23 grams of sodium reacts with 293 cm 3 of water that is initially at 298 k. it produces an enthalpy change of 197 kj. what is the final temperature of the water? the specific heat capacity of water is 4.18 j/k g.
448 K is the final temperature of the water.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Given,
the mass of Na is 23 g
The volume of water = 293 cm3
Mass of water = 293 g
Total solution mass = 23 g + 293 g = 316 g
Specific heat capacity of water = 4.18 J/Kg
The equation relating mass, heat, specific heat capacity and temperature change is:
q = mcΔT
197 kJ = 316 g x 4.18 J/Kg x ([tex]T_{finals} - T_ {initial}[/tex])
197 kJ = 316 g x 4.18 J/Kg x ( [tex]T_{finals}[/tex]-298 K)
0.1491429956 x 1000 = [tex]T_{finals}[/tex]-298 K
149.1429956 + 298 = [tex]T_{finals}[/tex]
447.1429956 = [tex]T_{finals}[/tex]
448 K = [tex]T_{finals}[/tex]
Hence, 448 K is the final temperature of the water.
What does a high specific heat capacity mean?A high specific heat capacity means that it can store a large amount of thermal energy for a small change in mass or temperature.
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A sample of gas has an initial volume of 3.97 L at a pressure of 709 mmHg . If the volume of the gas is increased to 5.36 L , what is the pressure
Answer:
525 mmHg
Explanation:
If all other variables are held constant, you can find the pressure using Boyle's Law. The equation looks like this:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can plug the given values into the equation and simplify to find "P₂".
P₁ = 709 mmHg P₂ = ? mmHg
V₁ = 3.97 L V₂ = 5.36 L
P₁V₁ = P₂V₂ <----- Boyle's Law
(709 mmHg)(3.97 L) = P₂(5.36 L) <----- Insert values
2814.73 = P₂(5.36 L) <----- Simplify left side
525 = P₂ <----- Divide both sides by 5.36
What is the chemical formula for the conjugate acid of the base trimethylamine (ch3)3n?
A conjugate acid is given by the acid-base theory of Bronsted–Lowry. The conjugate acid of a weak base, trimethylamine is ((CH₃)₃NH⁺) trimethylammonium ion.
What is a conjugate acid?A conjugate acid is a compound that has been formed when a base accepts the hydrogen or the proton ion from an acid. It can also be said that a hydrogen ion is added to a base.
The conjugate acid differs from the base by the addition of one proton ion to it. The reaction of a weak base, trimethylamine can be shown as,
(CH₃)₃N(aq) + H₃O⁺(aq) ⇌ (CH₃)₃NH⁺(aq) + H₂O(l)
Here, the trimethylamine compound has accepted a proton from hydronium to produce a conjugate acid, trimethylammonium cation, (CH₃)₃NH⁺.
Therefore, trimethylammonium (CH₃)₃NH⁺ is the conjugate acid of trimethylamine.
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More strong base is added until the equivalence point is reached. what is the ph of this solution at the equivalence point if the total volume is 57. 0 mlml ?
A more strong base is added until the equivalence point is reached. The ph of this solution at the equivalence point if the total volume is 57. 0 mill is 9.8
The potential of Hydrogen is what pH is formally known as. The negative logarithm of the concentration of H+ ions is known as pH. Thus, the definition of pH as the amount of hydrogen is provided. The hydrogen ion concentration in a solution is described by the pH scale, which also serves as a gauge for the solution's acidity or basicity.
The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
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Calcium Oxide at mass 14.0g react with water. Determine the mass at which the calcium hydroxide formed. [ Ca=40, O=16, H=1]
CH3OH ___ ions in an aqueous solution. A) forms B) does not form
CH3OH doesn't form ions in an aqueous solution.
Water and one or more dissolved substances make up aqueous solutions. In an aqueous solution, solids, gases, or other liquids may dissolve. Examples of watery solutions include coke, seawater, rain, acid, base, and salt solutions. A solution that is not an aqueous solution is any liquid that does not contain water.
Solutions that contain water as the solvent are known as aqueous solutions. Water is a great solvent, but not everything will easily dissolve in it. The term "aqueous" in a chemical equation designates a material in water. For instance, adding sodium hydroxide solution to diluted hydrochloric acid results in the production of sodium chloride.
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Enter your answer in the provided box. what is the original molarity of an aqueous solution of ammonia (nh3) whose ph is 11. 02 at 25°c? (kb for nh3 = 1. 8 × 10−5) m
The original molarity of an aqueous solution of ammonia whose pH is 11. 02 at 25°C is 0.556 M
Calculation ,
Given : pH = 11.5
[tex][H^{+} ][/tex] = [tex]10^{-11.5}[/tex]
[tex][OH^{-} ][/tex] = [tex]K_{w} /[H^{+} ][/tex] = [tex]10^{-14}[/tex]/ [tex]10^{-11.5}[/tex] = [tex]10^{-2.5}[/tex] M
Kb = [tex][NH_{4}^{+} ][OH^{-} ]/[NH_{4} OH][/tex] = [tex](10^{-2.5})^{2} /C[/tex] = 1.8×[tex]10^{-5}[/tex] M
C = 1/1.8 = 0.566 M
So, molarity of an aqueous solution of ammonia is 0.566 M
pH ia a measure of hydrogen ion concentration , a measure of acidity or alkalinity of the solution .pH scale usually range from 0 to 14 Aqueous solutions at 25°C witha pH less rhan 7 are acidic , whereas , those with pH greater than 7 are basic or alkaline. pOH ia a measure of hydroxide ion concentration , a measure of alkalinity of the solution .
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When the equation __no2 __h2o __o2 → __hno3 is balanced, the coefficient of hno3 is:_________
When the equation __[tex]NO_{2}[/tex] __[tex]H_{2} O[/tex] __[tex]O_{2}[/tex] → __[tex]HNO_{3}[/tex] is balanced, the coefficient of hno3 is 4.
An expression for a chemical reaction would be referred to as balanced if both the reactants as well as the products have an identical number of atoms with a total charge for each component of the reaction. In other words, two sides of the reaction have equal amounts of mass as well as charge.
The given unbalanced equation is __[tex]NO_{2}[/tex] __[tex]H_{2} O[/tex] __[tex]O_{2}[/tex] → __[tex]HNO_{3}[/tex] .
It can be seen that the count of hydrogen in reactant side 2 on the other hand the count of hydrogen atom is 1.
By multiplying by 4 as the coefficient of and [tex]NO_{2}[/tex] and by 2 as the coefficient of water then equation will be balanced.
The balanced chemical equation will be expressed as:
4 [tex]NO_{2}[/tex] + 2[tex]H_{2} O[/tex] +[tex]O_{2}[/tex] → 4[tex]HNO_{3}[/tex] .
Therefore, when the equation __[tex]NO_{2}[/tex] __[tex]H_{2} O[/tex] __[tex]O_{2}[/tex] → __[tex]HNO_{3}[/tex] is balanced, the coefficient of hno3 is 4.
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