Answer:
C.. Group I element they dissolve in water to form alkaline solution
B.. Element between group II and III and most of them form coloured compound
A... Group VII element they react with metals to form salts
which statement is correct for an endothermic reaction? a. bonds in the products are stronger than the bonds in the reactants. b. bonds in the reactants are stronger than the bonds in the products. c. the enthalpy of the products is less than that of the reactants. d. the reaction is spontaneous
It is appropriate for just an endothermic reaction when the reactant's bonds are stronger than the product's bonds.
The correct answer is B
What is an endothermic reaction?Chemical reactions classified as endothermic occur when the reactants absorb heat energy from their surroundings to produce products. These occurrences have a cooling effect because they make their immediate surroundings colder.
What action is endothermic?If heat is absorbed by system from of the environment, the reaction and physical change is endothermic. As a result of the system absorbing heat from its surroundings during an endothermic process, the environment's temperature drops.
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a main-group element has an outer electron configuration of ns2np3 . what charge is likely for an ion of this element?
The charge for an ion of an element that has an outer electron configuration of ns2np3 is -3.
To be in a stable state, electrons try to make a noble gas configuration. The noble gas configuration is ns2 or ns2np6. So electrons try to gain or lose electrons to become ions. Ions have a charge according to the number of electrons captured (negative charge) or released (positive charge). The charge for an ion with the electron configuration
ns1 is +1ns2 is +2ns2np1 is +3ns2np2 is +4ns2np3 is -3.ns2np4 is -2.ns2np5 is -1.Ions with a negative charge are anions while ions with a positive charge are cations.
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What is the outer part (B) of an atom called?
Answer:
B is the outer part atom .
The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). The atoms have different properties based on the arrangement and number of their basic particles.SO the hydrogen atom (H) contains only one proton, one electron, and no neutrons
Explanation:
a series circuit contains 40 ohms of resistance (r) and 70 ohms of capacitive reactance (xc). when 100 volts ac are applied, how much current flows? (round the final answer to two decimal places.)
The current that flows in the circuit is obtained as 1.23 A.
What is RLC circuit?We know that the RLC circuit is one that contains a resistor in addition to a capacitor or an inductor. In either case, the resistance that is offered to the flow of current by the capacitor or the inductor as the case may be is called the reactance.
Given that;
Impedance (Z) = √R^2 + XC^2
R = resistance
XC = capacitive reactance
Z = √(40)^2 + (70)^2
Z = 81 ohms
Now;
V = IZ
V = voltage
I = current
I = V/Z
I = 100 volts/81 ohms
I = 1.23 A
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what molecule is the final electron acceptor after the electron has moved through the electron transport chain?
Oxygen is the final electron acceptor after the electron has moved through the electron transport chain.
In the electron transport chain, electrons are moved from protein to protein. The transport chain's succeeding proteins can each take an electron with a lower energy. Energy is released as electrons go from a high-energy state to a low-energy state. Protons are pumped across the membrane using this energy to create a gradient.
Oxygen serves as the ultimate electron acceptor (O2). Since oxygen has a strong affinity for electrons and a high electronegativity.
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After passing through the cycle of electron transport, oxygen serves as the last electron acceptor.
From protein to protein, electrons are transferred along the electron transport chain. The proteins that follow in the transport chain can each accept an electron with a lower energy. Electrons move from a high-energy state to a low-energy state, releasing energy in the process. This energy is used to drive protons across the membrane, producing a gradient. As the ultimate electron acceptor, oxygen (O2). A high electronegativity and significant attraction for electrons are seen in oxygen.
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Sold substance a has a melting point at 100c. liquid substance b has a freezing point at 110c. for each substance, identify its state of matter and describe the motion of its particles when the substance is at 115c.
Substance A is a solid at 115° Celsius. Its particles are not moving while Substance B is a liquid at 115° degrees Celsius. Its particles are moving around freely.
Solid particles in substance A are not moving because they are held together by strong intermolecular forces. Liquid particles in substance B are moving around freely because they are not held together by strong intermolecular forces.
Intermolecular forces are the forces that hold molecules together. These forces are much weaker than the covalent or ionic bonds that hold atoms together in a molecule, but they are strong enough to keep molecules from flying apart. The four main types of intermolecular forces are dipole-dipole forces, London dispersion forces, hydrogen bonding, and ion-dipole forces.
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if the mass of agno3 is 5,3g per spoon. calculate the concentration of the solution after two spoons have been added
Assuming the solution is taken in 1 L volume so that the number of moles of AgNO₃ with 10.6 g or two spoon is 0.062 moles. Thus the concentration of the solution is 0.06 molar.
What is molarity?Molarity of a solution is the ratio of its number of moles of solute to the volume of solution in liters. Molarity is a temperature dependent quantity. This is the most common term for concentration of a solution.
The molar mass of AgNO₃ is 169.9 g/mol. One tea spoon silver nitrate is 5.3 g thus, two tea spoon is 10.6 g. The number of moles of 10.6 AgNO₃
= mass/weight
= 10.6 g / 169.9 g/mol
= 0.062 moles.
Thus the concentration of 0.062 moles in 1 L solution is 0.062 molar.
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the species oxidized shows a(n) the species oxidized shows a(n) drop zone empty. the species reduced shows a(n) the species reduced shows a(n) drop zone empty. the species that shows a decrease in oxidation number is the the species that shows a decrease in oxidation number is the drop zone empty. the species that shows an increase in oxidation number is the the species that shows an increase in oxidation number is the drop zone empty. reducing agent. decrease in oxidation number. oxidizing agent.
1) The species oxidized shows a(n) = increase in oxidation number.
2) The species reduced shows a(n) = decrease in oxidation number.
3) The species that shows a decrease in oxidation number is the = oxidizing agent.
4) The species that shows an increase in oxidation number is the = reducing agent.
What do you mean by oxidation and reduction?The degree of biological activity controls both the formation of zones where specific redox processes predominate and the progression of environmental redox reactions. Anoxia, which are situations when the concentration of dissolved molecular oxygen is extremely low, is a requirement but not a sufficient condition for lowering conditions. The active microbial population shifts from communities that depend on aerobic respiration, in which molecular oxygen serves as the terminal electron acceptor, to anaerobic respiration, in which other chemical substances take the place of molecular oxygen as the terminal electron acceptor supporting respiration, as a result of the development of anoxia.
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Does alcohol really burn off when cooking? what are the possible substitutions for alcohol in recipes?.
Yes, alcohol burns off when cooking. To make sure that alcohol cooks out completely, you need to cook the food longer. The possible situation for alcohol in recipes is fermentation.
Foods undergo fermentation process for saving and storing them for longer periods through preservation.
In general, alcohol is used during fermentation process to increase their storage time.
During fermentation, food is cooked for about 15 minutes. That is why most foods contain almost 40 percent of alcohol in them.
In order to remove alcohol, it is necessary to cook food longer. The longer you cook, the more alcohol cooks out.
However, to remove all traces of alcohol, make sure to cook food for about three hours.
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the molecular art depicts the following reversible reaction at equilibrium: co( g) cl2( g) image cocl2( g). what can be inferred about the equilibrium constant, k, for this reaction?
The molecular art depicts the following reversible reaction at equilibrium: CO( g) + Cl₂ ( g) image COCl₂( g). the equilibrium constant, k, for he given reaction is above one , that means K > 1.
The chemical reaction is given as :
CO( g) + Cl₂ ( g) ⇄ COCl₂( g)
the equilibrium constant is given as :
K = [ COCl₂ ] / [ CO ] [ Cl₂ ]
here, K > 1
if the value of K is greater than 1 that means the reaction is product favored.if the value of K is less than 1 that means the reaction is reactant favored .if k = 1 , neither product nor the reactant favor.Thus, The molecular art depicts the following reversible reaction at equilibrium: CO( g) + Cl₂ ( g) image COCl₂( g). the equilibrium constant, k, for this reaction is greater than 1, K > 1.
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what mass of methane will occupy the same volume as 0.0325 mol 0.0325 mol of propane at 1.00 atm 1.00 atm and 298 k?
0.79 gram is the mass of methane that will occupy the same volume as 0.0325 mol of propane at 1.00 atm 1.00 atm and 298 k.
The atmosphere contains small amounts of the gas known as methane. The simplest hydrocarbon is methane, which only has one carbon atom and four hydrogen atoms. Strong greenhouse gas methane is. Numerous anthropogenic (influenced by humans) and natural sources release methane into the atmosphere. Landfills, natural gas and oil pipelines, industrial processes, mining for coal, stationary and mobile combustion, wastewater treatment, and certain agricultural practises are examples of anthropogenic emission sources. propane primary applications include heating homes and water, preparing and storing food, driers for clothing, and industrial and farm machinery. Propane is also used as a raw material in the chemical industry to create plastics and other compounds.
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in the tlc experiment silica gel is used as a solid phase to differentiates between what kind of compounds?
Silica gel and alumina are the most often utilized adsorbents. A wide range of chemicals, including hydrocarbons, alcohols, ketones, esters, acids, azo compounds, and amines, are separated using silica gel.
Because of its outstanding separation capabilities, the Silica Gel G for Thin Layer Chromatography as binder is most commonly employed as an adsorbent in thin-layer chromatography.
What is Silica Gel?Silica gel is a porous and amorphous type of silicon dioxide composed of an uneven tridimensional structure of alternating silicon and oxygen atoms with nanometer-scale holes and pores. The spaces might be filled with water or other liquids, or they could be filled with gas or a vacuum.
Silica gel is a desiccant, which means it is a drying agent. Its purpose is to absorb moisture and condensation from its surroundings. It is a very efficient and cost-effective method for businesses to keep their items fresh and dry for consumers during storage and shipping procedures.
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an experiment called for l of sulfur dioxide, , at and atm. what would be the volume of this gas at and atm?
since you have Sulphur dioxide in the experiment . Use Charles' Law, to know the volume [tex]V 1 /T 1 = V 2/ T 2[/tex]
what is the volume of the gas ?
The volume of gas is defined as the space occupied by the gaseous particles at standard temperature and pressure conditions. It is denoted as 'V'. The SI unit of volume is 'Litres' denoted as 'L'. A mole of gas has a volume at room temperature.Boyle's Law - states that the volume of a given amount of gas held at constant temperature varies inversely with the applied pressure when the temperature and mass are constant.Volume = length x width x height.You only need to know one side to figure out the volume of a cube.The units of measure for volume are cubic units.Volume is in three-dimensions.You can multiply the sides in any order.Which side you call length, width, or height doesn't matter.The volume of a gas is directly proportional to its temperature when pressure is constant. The ratio of volume to temperature is constant when pressure is constant. This relationship is known as Charles' law or Gay-Lussac's law .to know more about volume of the gas follow
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fermentation products can include commonly known compounds such as lactic acid and ethanol, but many other products like butanol, acetic acid, and succinic acid are also possible because
Fermentation products can include commonly known compounds such as lactic acid and ethanol, but many other products like butanol, acetic acid, and succinic acid are also possible because, these products arise to complete catabolism of glucose and regenerate NAD+ from NADH.
What is Fermentation?
It is an anaerobic process in which energy can be released from glucose even if oxygen is not available.”
The main purpose of fermentation process is not producing energy but to regenerate the NAD+ from NADH. The NAD+ thus produced are utilised in oxidation of glucose. The NAD+ is reduced to NADH and is used in various stages of glucose oxidation (glycolysis, Krebs cycle, oxidative phosphorylation). Thus production of NAD+ along with butanol, acetic acid, succinct acid helps in continuing the glucose oxidation without interruption of shortage of oxidising agent (NAD+)Learn more about fermentation - Brainly.com https://brainly.com/question/11554005
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What compound is formed from Ca2+ and Cl1-
Answer:
You get CaCl2 (Calcium chloride)
Explanation:
Calcium has a +2 charge and chlorine has a -1 charge. You need the net ionic charge to equal zero so you need two chlorine atoms to have the +2 cancel out. You end up with CaCl2.
when you go from left to right more protons are added to the atom. why would that make it get smaller when more particles are added
The atom get smaller when more particles are added as forces of attraction between protons and electrons increase.
The attraction between the nucleus and shell grows as we add additional protons and electrons, which causes the shell to shrink. The atom shrinks as a result. Your final and first-to-last paragraphs are attempting to mimic the behavior of electrons; the first cannot increase and should remain the same, while the second is contracting.
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Diana measured 233 mL for the volume of the object. The actual volume of the object was 241 mL. What is the percent error of Diana’s results?
Answer:
3.32%
Explanation:
To calculate the percent error, you need to use the following equation:
| measured value - actual value |
Percent Error = -------------------------------------------------- x 100%
actual value
In this equation, the measured value is the amount generated after running an experiment. The actual value is the amount generated solely through calculations.
Measured Value = 233 mL
Actual Value = 241 mL
| 233 mL - 241 mL |
Percent Error = -------------------------------- x 100%
241 mL
8 mL
Percent Error = ----------------- x 100%
241 mL
Percent Error = 0.0332 x 100% = 3.32%
what is the energy (in joules) of the photon emitted when the electron of a he cation relaxes from the 3s orbital to the 2s orbital? enter the numerical answer only; do not enter a unit.
the energy emitted by photon was 0.300564×10-18 J
what is photon?
The term photon, which means "light" in Ancient Greek, refers to a basic particle that is a quantum of the electromagnetic field, which includes electromagnetic radiation like light and radio waves. It also serves as the force carrier for the electromagnetic force. Considering that photons have no mass, they always travel at the speed of light in a vacuum, which is 299792458 m/s (or 186,282 mi/s).
formula was
ΔE=R(1n2f−1n2i)
R=the Rydberg constant, 2.178×10-18 J
For a transition from n=3 to n=2, we get
ΔE=2.178×10-18 J(1/22−1/32)
=2.178×10-18 J(1/4−1/9)
=2.178×10-18 J× 9 – 4/9×4
=2.178×10-18 J× 5/36
=0.300564×10-18 J
hence the energy emitted by the photon was 0.00564x10-18J
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what should the mole percent of oxygen be in the diving gas for the partial pressure of oxygen in the mixture to be 0.21 atm , the same as in air at 1 atm ?
the mole percent of oxygen be in the diving gas for the partial pressure of oxygen in the mixture to be 0.21 atm , the same as in air at 1 atm is 2.52%
Atm 8.32 is the total pressure.
0.21 atm is the partial pressure of oxygen gas.
The relationship between partial pressure, total pressure, and mole fraction is depicted here.
partial oxygen pressure Total pressure x Mole percent of oxygen -
Calculate the gas's mole fraction of oxygen.
0.21 atm 8.32 x Mole fraction
Mole fraction = 0.21/8.32 = 0.0252
As illustrated below, determine the mole percent of the gas. Mole percent is equal to the mole fraction divided by 100, which is 0.0252 times 100 and 2.52% respectively.
As a result, oxygen's mole percent is 2.52%.
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An alloy of bronze was made by combining 88 % copper and the rest is composed of tin. Determine the density of the bronze sample using a weighted average.” 8.76g/cm
Based on the densities and percent mass of copper and tin, the density of Bronze is 8.76 g/cm³.
What is density?Density is the ratio of the mass and volume of a substance.
Density = mass/volumeFor a mixture, the density of the mixture is the weighted average of the densities of the substance in the mixture.
The density of the bronze is calculated as follows;
The density of bronze = percent mass of copper * density of copper + mass of tin * density of tinThe density of copper = 8.96 g/cm³
Percent mass of copper = 88%
The density of tin = 7.3 g/cm³
Percent mass of tin = 12%
The density of Bronze = 88% * 8.96 + 12% * 7.3
The density of Bronze = 8.76 g/cm³
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mass of methane will occupy the same volume as 0.0325 mol 0.0325 mol of propane at 1.00 atm 1.00 atm and 298 k?
5.18 grams of methane will occupy same volume as 0.0325 moles of propane.
The ideal gas equation says,
PV = nRT
Where,
P is pressure, V is volume, n is moles, R is gas constant, T is temperature.
Moles of propane is 0.0325 moles.
volume of propane at 1 atm and 298 K is,
V = nRT/P
V = 0.0325 x 0.082 x 298/1
V = 7.92 L
Volume of propane is 7.92 L.
we know, moles = mass/molar mass.
Molar mass of Methane is 16g/mol.
Moles of methane = mass/16
Volume of methane,
V = nRT/P
7.92 = mass x 0.082 x 298/16
Mass = 5.18grams.
So, 5.18 grams of methane will have same volume as that of 0.0325 moles of propane.
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1. A sample of a pure substance has a mass of 18 g and a volume of 2 cm) Find the density of
the sample.
potassium sulfate and calcium chloride
Express your answer as a chemical equation. Identify all of the phases in your answer. Enter NOREACTION if no reaction occurs.
Potassium sulfate and Calcium chloride reacts with each other to form Potassium chloride and Calcium sulphate. The chemical yield in this process is about 99%.
The balanced chemical reaction for the reaction of Potassium sulfate and Calcium chloride is given as:
CaCl₂ + K₂SO₄ → CaSO₄ + 2KCl
The reaction between Potassium sulfate and Calcium chloride is a double displacement type of reaction.
Double displacement reaction is a type of reaction where one part of the reactant is replaced by the another part of the reactant.
The general form of double displacement reaction is written as:
AB + CD → AD + BC
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how many moles of chloride ions can be found in a solution made from 1.25 moles of magnesium chloride?
2.5 moles of chloride ions can be found in a solution made from 1.25 moles of magnesium chloride.
Magnesium Chloride is an remedy used to save you and deal with low amounts of magnesium inside over the counter blood. Magnesium is crucial for over the counter everyday functioning of cells, muscle mass, bones, nerves, and over-the-counter heart. This medicine is to be had as an injectable solution and isn't always covered over-the-counter aid of Medicare.
Eye may reason mild eye irritation and skin can also motive skin inflammation. Ingestion causes gastrointestinal inflammation with nausea, vomiting and diarrhea. Inhalation may also motive breathing tract inflammation.
Magnesium chloride is likewise safe for guys, ladies, children, and throughout pregnancy. over the counter magnesium chloride can also help over-the-counter body process and soak up some over the counter critical mineral, calcium. Magnesium has also been shown to contribute to a healthy coronary heart, ordinary blood stress degrees, strong bones.
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thin-layer chromatography was performed and four spots were visualized on the glass slide. the substance with which rf value was least soluble in the stationary phase?
The spot with the lowest Rf value would be the most polar one and, thus, the one that is least soluble in the stationary phase.
Does more polarity indicate a higher or lower Rf value?
Calculating the Rf value is possible if you can see the spots. The identity and properties of the various compounds can be established using the Rf values. Since more polar compounds have a stronger affinity for the polar solid phase, they will have smaller Rf values.Rf values are typically higher for low polarity chemicals compared to higher polarity ones. Generally speaking, as polarity of a compound increases, so does its adsorptivity (i.e. the more polar the compound then the stronger it binds to the adsorbent).To learn more about Rf values, follow the link https://brainly.com/question/14393432
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if you require 33.38 ml of 0.1936 m n a o h naoh solution to titrate 10.0 ml of h c 2 h 3 o 2 hcx2hx3ox2 solution, what is the molar concentration of acetic acid in the vinegar?
The molar concentration of acetic acid in vinegar is 64.62 M
Titration is known as the quantitative concentration of a given solution. It is also known as the quantitative analysis.
In the given condition we have 33.38ml of 0.1936 molar of NaoH solution to titrate 10ml of HC2H3O2.
Therefore,
HC2H3O2 + NaoH - H2O + NaC2H3O2
The concentration of the given base (NaoH) = 0.1936 molar.
The volume of the given bae = 33.38ml.
The volume of acetic acid = 10ml.
We can denote the concentration and volume of the given samples as,
Ca = concentration of acetic acid
Cb = concentration of the base( NaoH)
Va = volume of acetic acid
Vb = volume of base.
By putting the value in equation, we get
Ca x Va = Cb x Vb
since, we need to find Ca, we need to shift the Va to the right-hand side.
Therefore,
Ca = Cb x Vb/ Va
Substituting the values we get,
Ca= 0.1936 x 33.38/ 10
Ca = 64.62 M
Therefore, the molar concentration of acetic acid is 64.62M
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a ground-state h atom absorbs a photon of wavelength 93.78 nm, and its electron attains a higher energy level. the atom then emits two photons: one of wavelength 2626 nm to reach an intermediate level, and a second to reach the ground state. what was the wavelength of the second photon emitted?
Wavelength of the second photon emitted is 97.3nm. By using the formula E = hc/λ.
What is hydrogen energy level?A photon's frequency and Planck's constant are used to calculate the quantum energy. The relationship between wavelength and frequency is inverse, as seen below.
v = c/ λ
The energy of photon of light: given by the formula,
E = hv
E = hc/λ
Given,
wavelength of photon of light at higher energy level is 93.78 nm.
wavelength of photon of light at intermediate level is 2626 nm = 2626×10⁻⁹m
Etotal = hc/λ
Where,
E is the energy of a photon.
h is the Planck's constant (6.626×10⁻³⁴J⋅s)
c is the speed of light (3.0×10⁸m/s)
λ is the wavelength, wavelength is 93.78 nm.
1nm = 1×10⁻⁹m
Therefore, conversion of 93.78 nm into m is, 93.78nm=93.78×10⁻⁹m
Substitute:
Etotal = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{93.78 .10^{-9} }[/tex]
Etotal = 2.12 × 10⁻¹⁸ J
the energy of 1 photon, E1 = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{2626 .10^{-9} }[/tex]
E1= 7.57×10⁻²⁰
the energy of 2 photon, E2 = Etotal-E1
E2 = 2.044× 10⁻¹⁸J
wavelength of second photon,
λ = hc/E2
λ = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{2.04 .10^{-18} }[/tex]
λ = 9.73 × 10⁻⁸m
conversion of m into nm, 1m = 1×10⁹nm
Therefore, conversion of 9.73×10⁻⁸m into nm is
9.73×10⁻⁸m = 9.73×10⁻⁸×10⁹nm =97.3nm
∴ wavelength of second emitted photon is 97.3nm.
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For mn3 , write an equation that shows how the cation acts as an acid.
Equation showing the Mn³⁺ cation acting as an acid:
Mn³⁺+ H₂O → MnOH²⁺ + H⁺
A cation is a positively charged ion in a metal element whose formation is carried out by releasing one or more electrons from its outermost electrons to achieve stability.
The intermediate reaction is an acid-base reaction. Acid-base reactions generally produce salt and water. However, in this reaction what is formed is an anion and a conjugate acid-base cation because it uses the Bronsted-Lowry acid-base principle. Mn³⁺ acts as an acid so that it donates a proton MnOH²⁺ to H⁺ so that the species formed are MnOH²⁺ and H⁺.
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the molar heat of fusion of water is 6.02 kj/mol. calculate the energy required to melt 46.8 g of water.
When the molar heat of fusion of water is 6.02 kJ/mol, it takes 15.4 kJ of energy to melt 46.8 g of water. The enthalpy of a substance changes due to heat of fusion , which releases energy.
To convert a substance from a solid to a liquid while maintaining pressure, a certain amount of the substance must be used.
A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state heat of fusion that is employed in numerous measurements in chemical, biological, and physical systems while the pressure is constant. Called enthalpy
46g/18g equals mols of water.
mole-1 equals 2.56 mole
1 mole melts at a temperature of 6.02KJ of heat.
Heat needed to melt 2.56 moles is equal to 6.02kJ*2.56 = 15.4kJ.
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2. A 12.2g sample of a hydrate was heated to a
constant mass of 10.2 grams. What is the
percent by mass of the water in the hydrate?
The percent by mass of the water in the hydrate is 83.6 percent.
Calculate the percent by the mass of each detail by using dividing the mass of that element by 1 mole of the compound by using the molar mass of the compound and multiplying by using one hundred%. consider your end result. the chances upload as much as a hundred%.
This system allows for displaying the bottom complete number of moles and the relative range of atoms of every detail in a compound. With the help of the empirical formulation, chemists can also calculate the actual molecular system. This component suggests the exact range of atoms within the compound.
Calculation:-
mass of hydrated sample = 12.2 gram
actual mass = 10.2
percentage mass = 10.2/12.2 × 100
= 83.6 percent.
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