The weight loss of an aluminum (Al) alloy corroding in HCI acid was observed to be 0.250 g/cm2 after an 8 h immersion period. What is the corresponding corrosion current density in mA/em2, assuming that all the corrosion is due to the reaction:
Al → Al3+ + 3e
The atomic weight of Al is 26.98 g/mol.
Answers
Answer:
I = 0.0931 A/cm^2 or 93.1 mA/cm^2
Explanation:
The computation of the corresponding corrosion is shown below:
As we know that
The mathematical form is
\(m=\frac{Q}{F} \frac{M}{z}\)
where,
m = substance mass
Q= total electric charge
F= Faradays constant i.e. = 96,500 C/mol
M = Substance molar mass
z = number of electrons transferred
Now
Q = It
where
I = current
And t = time
\(m=\frac{Q}{F} \frac{M}{z}\)
So,
\(I = \frac{mFz}{tM}\)
Now it is mentioned that
z=3, M=26.98 g/mol, m=0.25 g/cm2
So,
\(I= \frac{0.25 g/cm^2 \times 96,500 C/mol \times 3}{((8\times60\times60 s)} \times 26.98 g/mol)\)
Hence,
I = 0.0931 A/cm^2 or 93.1 mA/cm^2
Related Questions
The following Lewis diagram represents the valence electron configuration of a main-group element.
This element is in group
.
According to the octet rule, this element would be expected to form an ion with a charge of
.
If is in period 5, the ion formed has the same electron configuration as the noble gas
.
The symbol for the ion is
.
Answers
This element is in group 1.
According to the octet rule, this element would be expected to form an ion with a charge of +1.
If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton
The symbol for the ion is Rb⁺
What is electronic configuration?Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.
Considering the given element:
It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.
Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.
The element is rubidium and the ion is Rb⁺.
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1. The number of moles of NH3 molecules in 34.0 g of NH3
Answers
Explanation:
Mol = g/MW
Mw of NH3 = 14 + 3(1) = 17
Mol = 34/17
= 2 mol
If potassium reacts so dangerously with water, and people are mostly made of water, why can we eat bananas without blowing up?
Answers
Answer:
A banana, like most other lifeforms, is about 70% water, and all the potassium it contains already exists in the form of K+ ions dissolved in water. Which is why bananas do not explode in water, or spontaneously combust.
Natural rubber consists of long chains of carbon and hydrogen atoms covalently bonded together. When Goodyear accidentally dropped some natural rubber on a hot stove, the heat joined these chains together to make vulcanized rubber. Vulcan was the Roman god of fire. The carbon-hydrogen chains in vulcanized rubber are held together by two sulfur atoms that form covalent bonds between the chains. These covalent bonds are commonly called disulfide bridges. Explore 3 other molecules that have such disulfide bridges.
Answers
Covalent bonds commonly called disulfide bridges are present in the following molecules:
secretory proteins,lysosomal proteins,membrane proteinsWhat are disulfide bridges?Disulfide bridges are bridges in molecules of substances that result when sulfur atoms in a given compound form covalent bonds between themselves.
The disulfide bridges may occur within the same molecules of a compound or between adjacent molecules in a compound.
Disulfide bridges are important in several compounds such as:
vulcanized rubber- in vulcanized rubber, disulfide bridges are important in strengthening and making rubber tougher.proteins - disulfide bridges are present in some proteins and help to stabilize the protein chains. For example, disulfide bridges are formed in the chains of the protein molecule insulin.Learn more about disulfide bridges at: https://brainly.com/question/13416739
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describe which process in the water cycle the water in each picture will go through next will go through next.
Answers
Answer:
water vapour I guess I the answer of your question
3. How many joules of heat are required to heat 20.5g of tin from 30°C to 230°C (Specific heat of tin = 0.213 J/g °C)
Answers
what happens to the amount of energy in the air of ChristChurch and El nino years
Answers
Answer:
I t transfers from the ocean to the air, however the current is not as warm so less energy will transfer from the current to the air making ChrisstChurch cooler than usual.
if an atom has 22 protons 28 neutrons 20 electrons what would its atomic number be
Answers
Answer:
22
Explanation:
The atomic number indicates the amount of protons, so it would be 22
A sample of argon gas occupies 673 mL in a flexible container at standard temperature and pressure (STP) of 1 atm and 273.15 Kelvin. What volume would the gas occupy if the pressure were reduced to 0.62 atm?
Answers
For a sample of argon gas that occupies 673 mL in a flexible container at standard temperature and pressure (STP) of 1 atm and 273.15 Kelvin is mathematically given as
v2=417.26mL
What volume would the gas occupy if the pressure were reduced to 0.62 atm?Generally, the equation for the ideal gas is mathematically given as
p1v1/t1=p2v2/t2
Therefore
v2=(p1v1t2)/t1p2
v2=(1*273.15*673)/273.15*0.62
v2=417.26mL
In conclusion, Volume
v2=417.26mL
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Why can liquids change shape but solids cannot
Answers
Answer:
Explanation:
the forces between the molecules are stronger in solid than in liquids
5 importance of chemistry
Answers
Answer:
1.Understanding chemical reactions and processes is essential for many industries, such as pharmaceuticals, agriculture, and energy production.
2.Chemistry plays a key role in developing new materials, such as plastics and semiconductors, with specific properties.
3.Chemical analysis and testing are used to detect and measure the presence of various substances, such as pollutants and contaminants.
4.The study of chemistry provides a fundamental understanding of the composition, structure, and properties of matter, which is essential for fields such as biology and physics.
5.Chemistry is essential for designing and developing new technologies, such as batteries, solar cells, and medical diagnostic tools.
Answer:
Understanding chemical reactions and the properties of matter is crucial for the development of new materials and technologies.
Chemistry plays a key role in industries such as medicine, agriculture, and energy production.
Chemistry is important for the study of environmental issues and the development of sustainable practices.
The principles of chemistry are essential for the development of new drugs and treatments in the field of medicine.
Understanding chemistry is important for the safe handling and disposal of chemical substances in industries and households.
PLEASE HURRY
50 POINTS !!!!
Select the correct compound.
Reactants undergo chemical reaction to form products.
This chemical equation represents one such reaction.
The coefficient for one of the reactants or products is incorrect.
Which part of the chemical equation is incorrect?
2C₂H₁0+ 100₂
8CO₂+ 10H₂O
Answers
The incorrect part of the chemical equation is the coefficient for the oxygen gas reactant.
The chemical equation you provided is incorrect in terms of the stoichiometric coefficients. The correct coefficients for the balanced equation should be:2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
Therefore, the incorrect part of the equation you provided is:2 C2H10 (should be C2H6) + 10 O2 → 8 CO2 + 10 H2O
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Which type of reaction is this reaction: K + Al(OH), KOH + Al?
O A. Decomposition
O B. Single Replacement
O C. Synthesis
O D. Double Replacement
O E. Combustion
Answers
What mass of NaCl is needed to produce a 26.4 mol/L with a 1.7 L volume?
Answers
we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.
To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.
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How many hydroxide ions are in 1.2mol of Mg(OH)2(aq)?
Answers
Answer:
There are 5.0 moles hydroxide ions in 2.5 moles magnesium hydroxide.
Explanation:
The chemical formula Mg(OH)2, indicates that there are two moles of hydroxide ions in each mole of the compound.
To determine the number of hydroxide ions in 2.5 mol Mg(OH)
2, multiply the moles of the compound by
\(2.5mol Mg(OH){2} X\frac{2 mol OH^{-} }{1mol Mg(OH){2} } = 5.0 mol OH^{-}\)
Hope it helps!!
make it the brainlist answer please
i. Three different representations of glucose are
given below. Identify each type
of model.
Answers
Answer:
Ball and stick model is 3D and has the atoms depicted as different Coloured balls Conected to each other by "sticks"
fischer projection has the atoms on the side coming out of the plane, the atoms at the ends going behind (going away from you)
bond line notation Is the most common it does not show the C or H bonds but instead carbons are represented by the bends
The three structures of glucose represent three different models, they are ball and stick model, Fischer projection and bond line notation, respectively.
Glucose is a type of simple sugar (carbohydrate) that does not further hydrolyze to give monosaccharides.
Ball and stick model: The atoms are portrayed as different colored balls connected to each other by "sticks." Fischer projection: The atoms on the sides of the plane are coming out of the plane, while the atoms at the ends are moving behind.Bond line notation: It is the most frequent representation method used; it lacks C and H bonds but instead depicts carbons through bends.Therefore, the three glucose structures reflect three distinct models: the ball and stick model, the Fischer projection, and the bond line notation, respectively.
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Draw the Fischer projection of D-glucose. Switch between an aldose and a ketose by clicking on "switch carbonyl group." Add or delete carbon atoms using the add ("+") or delete ("x") buttons. Clicking on a blue box once adds a hydrogen atom (H). Clicking on a blue box again toggles between H and OH.
Answers
Answer:
The Fischer Projection formula of D-glucose is as shown in the attachment below.
The chiral centre that determines its name is the last carbon from the carbonyl group, C-6
Explanation:
Fisher projection formulas are used to show sugars in their open chain form. In a Fischer projection, the carbon atoms of a sugar molecule are joined vertically by solid lines, while carbon-oxygen and carbon-hydrogen bonds are joined horizontally using solid lines as well.
The horizontal bonds project out of the plane of the paper or screen towards the reader whereas vertical bonds project behind the plane of the paper or screen, away from the reader.
Glucose is an aldose sugar with two different optical isomers or enantiomers, D-glucose and L-glucose. The designation D- or L- depends on the configuration of the chiral or asymmetric carbon most distant from the carbonyl carbon of glucose. If the chiral carbon has the same configuration as D-glyceraldehyde, that the -OH roup on the right side of the carbon and -H group on the left, it is snamed D-glucose. However, if the chiral carbon has the same configuration as L-glyceraldyde, that is with the -OH group on the right and the -H group on the right, it is named L-glucose
Most ecosystems originally get their energy from
Answers
All of the following statements are true of compounds EXCEPT *
compounds are composed of various elements.
the processes that form compounds can not be reversed.
a compound is a pure substance.
compounds are joined by a chemical reaction.
Answers
Answer:
Pure substances are further broken down into elements and compounds. ... A mixture is composed of different types of atoms or molecules that are not chemically bonded. substance A form of matter that has constant chemical composition and ... of atom and cannot be broken down or transformed by a chemical reaction.
Explanation:
Compare and contrast properties of stable nuclei and radioactive nuclei.
Answers
To solve this we must be knowing each and every concept related to radioactive nuclei. Therefore, stable nuclei can not undergo radioactive decay. Radioactive nuclei can undergo radioactive decay.
What is radioactive nuclei?Nuclei that are radioactive Nuclei that are unstable and produce radiation. The vast bulk of atomic nuclei discovered in nature are stable, meaning they do not disintegrate over time.
As a result, the natural environment has only two kinds of unstable nuclei: those with a lifetime of billions of years (including such uranium or thorium) and those that are continually renewed.
Therefore, stable nuclei can not undergo radioactive decay. Radioactive nuclei can undergo radioactive decay.
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Question 1
Given the equation: Q = mcAT
Q = heat (in Joules)
m = mass (in grams)
C = 4.18 (specific heat capacity)
AT change in temperature (°C)
How many Joules of heat energy are absorbed when 200 grams of water are heated from 20 C to 60 C.
Answers
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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An aqueous solution is 12.0% by mass silver nitrate, AgNo3, and had a density of 1.11 g/ml. The mole fraction of silver nitrate in the solution is?
Answers
Answer:
Explanation:
To find the mole fraction of silver nitrate in the solution, you need to first find the molar mass of silver nitrate and then the number of moles of silver nitrate in the solution. Here's how you can do that:
Calculate the molar mass of silver nitrate:
AgNo3 has a molar mass of 169.87 g/mol
Calculate the mass of silver nitrate in the solution:
The solution is 12.0% by mass silver nitrate, so the mass of silver nitrate in 100 mL of the solution is:
mass of AgNO3 = 100 mL * 0.12 g/mL = 12 g
Calculate the number of moles of silver nitrate:
Number of moles of AgNO3 = mass of AgNO3 / molar mass of AgNO3
Number of moles of AgNO3 = 12 g / 169.87 g/mol = 0.0703 moles
Calculate the number of moles of the solvent (water) in the solution:
Since the density of the solution is 1.11 g/mL, the mass of 100 mL of the solution is 111 g. The mass of water in the solution is:
mass of water = 111 g - 12 g = 99 g
Since the molar mass of water is 18.015 g/mol, the number of moles of water in the solution is:
number of moles of water = 99 g / 18.015 g/mol = 5.49 moles
Calculate the mole fraction of silver nitrate:
The mole fraction of silver nitrate is the ratio of the number of moles of silver nitrate to the total number of moles in the solution:
mole fraction of AgNO3 = 0.0703 moles / (0.0703 moles + 5.49 moles) = 0.0127
So, the mole fraction of silver nitrate in the solution is 0.0127.
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
How many moles of magnesium atoms react with 1 mole of oxygen molecules?
Answers
1 mole of magnesium atoms will react with 2 moles of oxygen molecules. This is because the chemical equation for the reaction between magnesium and oxygen is: Mg + O2 → MgO.
What is chemical equation?A chemical equation is a symbolic representation of a chemical reaction, showing the reactants (starting materials) on the left side and the products (resulting substances) on the right side. The symbols used to represent the reactants and products are chemical formulas, which use the symbols of the elements in the reaction. The arrow between the reactants and products indicates the type of reaction taking place. The coefficients next to the symbols and formulae of entities indicate the number of moles of each species that are involved in the reaction. The overall reaction is balanced when the number of atoms of each element on the left side of the equation is equal to the number of atoms of that element on the right side of the equation.
This equation shows that for every 1 mole of magnesium atoms, 2 moles of oxygen molecules are required for the reaction to take place. Therefore, 1 mole of magnesium atoms will react with 2 moles of oxygen molecules.
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pOH of the 0.001M NaOH solution is
Answers
The pOH of the 0.001 M NaOH solution is approximately 3.
To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.
In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.
The pOH is calculated using the equation:
pOH = -log[OH-]
Substituting the concentration of hydroxide ions, we have:
pOH = -log(0.001)
Using a calculator, we can evaluate the logarithm:
pOH ≈ 3
Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.
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Pls answer how many neutrons, protons, and electrons there are. I will give points, thanks, 5 stars, and brainliest if you answer correctly. Thank you and have a nice day :)
Answers
Answer:
19 electron 19 proton 20 neutrons
Sir Isaac Newton's only discovery was the three laws of motion
Answers
Answer:
No.
Explanation:
He also created a telescope and formula for universal gravity.
Can i have the answers
Answers
Answer:
Explanation:
NO₂ --> NO + O₂
We need the same number of each atom on both sides of the equation.
There is 1 nitrogen on the left and right sides of the equation. At this point, the nitrogens are balanced on both sides of the equation.
There are 2 oxygens on the left side and a total of 3 oxygens on the right side (1 oxygen in NO and 2 oxygens in O₂). The oxygens are not balanced.
We can place a 2 in front of NO₂ on the left side and 2 in front of NO on the right side. This will give 4 oxygens on the left side and a total of 4 oxygens on the right side.
We also have now 2 nitrogens on the left side and 2 on the right side.
2 NO₂ --> 2 NO + O₂
The equation is balanced with 2 nitrogens and 4 oxygens on both sides of the equation.
Help me please.
How do animals see their pray without light?
Answers
Answer:Many nocturnal animals have a mirror-like layer, called the tapetum, behind the retina, which helps them make the most of small amounts of light.
Explanation:
The compound that is not an organic alcohol is:
C 3H 7OH
CH 3CH(OH)CH 3
C 6H 5COOH
(CH 3) 2CHCH(OH)CH 2CH 3
Answers
Answer:
The compound that is not an organic alcohol is C6H5COOH.
C3H7OH is propyl alcohol, CH3CH(OH)CH3 is 2-propanol, and (CH3)2CHCH(OH)CH2CH3 is 3-pentanol, all of which are organic alcohols.
On the other hand, C6H5COOH is benzoic acid, which is not an alcohol but an organic acid. It contains a carboxylic acid (-COOH) functional group and not the -OH functional group of alcohols.