Answer:
40.0
40.009 contains 5 significant figures and 3 decimals. 40.009 rounded to 4 sig figs is 40.01, to 3 sig figs is 40.0, and to 2 sig figs is 40.. To count the number of sig figs in 40.009, count all 5 digits since it has no insignificant digits (all digits are significant).
what is the number of atoms in a volume of 4.48 L of He gas STP?
a) 6.02 x 10^23
b) 3.02 x 10^23
c) 1.34 x 10^25
d) 1.20 x 10^23
Avogadro's number can be multiplied by the number of moles to determine the number of atoms in 4.48 L of He gas at STP is 1.20 x 10²³ atoms.
Option D is correct.
Evaluating :N = N × n
= 6.02 x 10²³ × 0.200 mol
= 1.20 x 10²³ atoms.
Therefore, the answer is 1.20 x 10²³ atoms.
What number does Avogadro have?
In physics and chemistry, Avogadro's number is a fundamental constant that indicates the number of atoms, ions, or molecules in one mole of a substance. It is exactly 6.02214076 x 10²³ particles per mole, as defined.
STP: What is it?Standard Temperature and Pressure is spelled STP. For the purpose of measuring the physical properties of gases, STP is utilized as a reference condition. It has a temperature of 0° Celsius and a pressure of one atmosphere.
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What is the volume, in liters, of 0.250 mole of oxygen gas at 20.0 C and 0.974 atm of
pressure?
The volume in liters, of 0.250 mole of oxygen gas at 20.0 C and 0.974 atm of pressure is 6.174L.
How to calculate volume?The volume of a substance can be calculated by using Avogadro's law equation as follows:
PV = nRT
Where;
P = pressureV = volume n = number of molesR = gas law constantT = temperatureAccording to this question, a 0.250 mole of oxygen gas at 20.0 C and 0.974 atm of pressure. The volume of the gas is calculated as follows:
0.974 × V = 0.250 × 293 × 0.0821
0.974V = 6.013825
V = 6.174L
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What is the acceleration when a running horse slows down from 15 m/s to 3 m/s in 2 seconds ??
Answer:
Explanation:
The acceleration can be calculated using the following formula:
acceleration = (final velocity - initial velocity) / time
In this case:
acceleration = (3 m/s - 15 m/s) / 2 seconds = -6 m/s^2
So the horse slows down with an acceleration of -6 meters per second squared. Note that the negative sign indicates that the direction of the acceleration is opposite to the direction of motion.
Using the following balanced equation 4 Fe(s) + 3O2(g) -> 2Fe2O3(s)
b) How many moles of product would be produced by complete reaction of 0.15 moles of oxygen gas? (Be sure to
show your work including the mole ratio you used)
Answer:
0.225 moles
Explanation:
Looking at the balanced equation, 4 moles of Fe(s) react with 3 moles of [tex]O_{2}[/tex](g) to produce 2 moles of [tex]Fe_{2}O_{3}[/tex](s). In other words, for every 3 moles of [tex]O_{2}[/tex] (g) used, there are 2 moles of product [tex]Fe_{2}O_{3}[/tex](s). The mole ratio is therefore 3:2. In other words, you the moles of [tex]O_{2}[/tex] by [tex]\frac{3}{2}[/tex] to find the moles of product.
There are 0.15 moles of [tex]O_{2}[/tex], so the moles of product should be 3/2 of this according to the molar ratio.
0.15 * [tex]\frac{3}{2}[/tex] = 0.225
Your answer is 0.225 moles.
Hope this helps!
by titration, it is found that 11.9 ml of 0.101 m naoh(aq) is needed to neutralize 25.0 ml of hcl(aq). calculate the concentration of the hcl solution.
By titration, it is found that the 11.9 ml of the 0.101 M NaOH(aq) is needed to neutralize the 25.0 ml of HCl(aq).The concentration of the HCl solution is 0.048 M.
The reaction is as follows :
NaOH + HCl ----> NaCl + H₂O
The concentration of the NaOH = 0.101 M
The volume of the NaOH = 11.9 mL = 0.0119 L
The moles of the NaOH = molarity ×volume
= 0.101 × 0.0119
= 0.0012 mol
The Volume of the HCl = 25 mL = 0.025 L
The moles of the HCl = 0.0012 mol
The concentration of the HCl = moles / volumes in L
= 0.0012 / 0.025
= 0.048 M
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i actually have no clue
for which of the following pairs are the atoms most likely to form an ionic bond with each other? group of answer choices carbon and sulphur sodium and iodine iodine and oxygen sodium and potassium
Out of the given pairs of atoms, sodium and iodine are most likely to form an ionic bond with each other.
Ionic bonds occur between atoms with significantly different electronegativities, where one atom donates an electron(s) to another atom, resulting in the formation of a positively charged cation and a negatively charged anion that are then held together by electrostatic forces.
Sodium (Na) has one valence electron and a relatively low electronegativity, while iodine (I) has seven valence electrons and a relatively high electronegativity. Therefore, when sodium and iodine come into contact, sodium is likely to donate its valence electron to iodine to form the ionic compound sodium iodide (NaI).
Sodium and potassium have similar electronegativity values and are both alkali metals, making them less likely to form ionic bonds with each other since their properties are similar.
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which is true for the mineral characteristic known as streak? question 1 options: streak is the color of the mineral when it is powdered all minerals have a streak streak is the color of the impurities found within the crystal structure. streak is the same as the visible color of the mineral.
Streak is the color of the mineral when it is powdered. This property is useful for identifying minerals, as the streak of a mineral is often different from its visible color.
For example, hematite, which appears as a dull red or brown in its natural form, has a streak that is a bright red color. This property is determined by rubbing the mineral on a piece of unglazed porcelain, which leaves behind a streak of the powdered mineral. Streak can be affected by the presence of impurities in the mineral, but in general, it is a reliable way to identify a mineral.Streak is a physical property of minerals that refers to the color of the powdered form of a mineral. It is determined by rubbing the mineral on an unglazed porcelain plate, which leaves behind a streak of the mineral's powder. Streak is a useful tool for mineral identification, as it can often be more consistent and distinct than the visible color of a mineral. For example, some minerals may have variable visible colors due to impurities, but their streak will be consistent. Streak can also be used to distinguish between minerals that may look similar but have different properties.
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What level of protein structure describes the spatial location of every atom in a protein? Choose one: A. 0'
B. 2'
C. 1'
D. 3'
Classify each of the following substance as acidic, basic, or neutral
- orange juice; (pH = 3.5)?
- drain cleaner; (pH = 13)?
Orange juice has a pH of 3.5,Drain cleaner has a pH of 13.The pH scale is a measure of the acidity or basicity (alkalinity) of a solution, ranging from 0 (most acidic) to 14 (most basic), with 7 being neutral.
Based on the given pH values, we can classify each substance as acidic, basic, or neutral:
Orange juice has a pH of 3.5, which is below 7, indicating that it is acidic. Orange juice is acidic due to the presence of citric acid, which is a weak organic acid found naturally in citrus fruits.
Drain cleaner has a pH of 13, which is above 7, indicating that it is basic (alkaline). Drain cleaners are typically basic due to the presence of strong alkaline compounds such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), which are used to dissolve clogs in drains and pipes.
In summary, based on their pH values, orange juice is acidic and drain cleaner is basic. It is important to note that both acids and bases can be harmful if not used or handled properly, and caution should always be exercised when working with them.
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For the first-order reaction 2N2O5 -> 2N2O4 + O2 at a particular temperature. The half-life of N2O5 is 0. 90 hours. What fraction of the initial concentration of N2O5 will remain after 2. 4 hours?
After 2.4 hours, only 15.8% of the initial concentration of N2O5 will remain when first-order reaction 2N2O5 -> 2N2O4 + O2 at a particular temperature. The half-life of N2O5 is 0. 90 hours.
The first-order reaction 2N2O5 -> 2N2O4 + O2 has a rate constant k that can be determined using the half-life of N2O5. The half-life of a first-order reaction is given by the equation:
t1/2 = ln(2) / k
where t1/2 is the half-life and ln is the natural logarithm.
Substituting the given half-life of 0.90 hours into this equation, we can solve for the rate constant k:
0.90 = ln(2) / k
k = ln(2) / 0.90
k = 0.77 / hour
Now we can use the integrated rate law for a first-order reaction to determine the fraction of the initial concentration of N2O5 that will remain after 2.4 hours:
ln([N2O5]t/[N2O5]0) = -kt
where [N2O5]t is the concentration of N2O5 at time t, [N2O5]0 is the initial concentration of N2O5, and k is the rate constant.
We want to find [N2O5]t/[N2O5]0 when t = 2.4 hours. We know that t1/2 = 0.90 hours, so after one half-life (0.90 hours), the concentration of N2O5 will be reduced to half its initial value. After two half-lives (1.80 hours), the concentration will be reduced to one quarter of its initial value, and so on. We can use this information to determine that 2.4 hours is equal to 2.67 half-lives:
2.4 hours / 0.90 hours per half-life = 2.67 half-lives
Substituting this value into the integrated rate law, we get:
ln([N2O5]t/[N2O5]0) = -kt
ln([N2O5]t/[N2O5]0) = -(0.77 / hour) x (2.4 hours)
ln([N2O5]t/[N2O5]0) = -1.85
Taking the antilogarithm of both sides, we get:
[N2O5]t/[N2O5]0 = e^-1.85
[N2O5]t/[N2O5]0 = 0.158
Therefore, after 2.4 hours, only 15.8% of the initial concentration of N2O5 will remain.
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in lab you're required to make 250.0 ml of a 1.7 m naoh solution. how many grams of naoh should you measure out to make the solution
you need to measure out 17.0 grams of NaOH to prepare a 1.7 M solution of 250.0 mL.
To calculate the amount of NaOH needed to prepare a 1.7 M solution of 250.0 mL, we can use the formula:
moles of solute = concentration (in M) x volume (in L)
First, we need to convert the volume from milliliters to liters:
250.0 mL = 250.0 / 1000 = 0.25 L
Now, we can plug in the values:
moles of NaOH = 1.7 M x 0.25 L
moles of NaOH = 0.425 mol
Finally, we can calculate the mass of NaOH required using its molar mass:
mass of NaOH = moles of NaOH x molar mass of NaOH
The molar mass of NaOH is 40.00 g/mol (sodium: 22.99 g/mol, oxygen: 15.99 g/mol, hydrogen: 1.01 g/mol).
mass of NaOH = 0.425 mol x 40.00 g/mol
mass of NaOH = 17.0 g
Therefore, To calculate the amount of NaOH needed to prepare a 1.7 M solution of 250.0 mL, we can use the formula:
moles of solute = concentration (in M) x volume (in L)
First, we need to convert the volume from milliliters to liters:
250.0 mL = 250.0 / 1000 = 0.25 L
Now, we can plug in the values:
moles of NaOH = 1.7 M x 0.25 L
moles of NaOH = 0.425 mol
Finally, we can calculate the mass of NaOH required using its molar mass:
mass of NaOH = moles of NaOH x molar mass of NaOH
The molar mass of NaOH is 40.00 g/mol (sodium: 22.99 g/mol, oxygen: 15.99 g/mol, hydrogen: 1.01 g/mol).
mass of NaOH = 0.425 mol x 40.00 g/mol
mass of NaOH = 17.0 g
Therefore, you need to measure out 17.0 grams of NaOH to prepare a 1.7 M solution of 250.0 mL.
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Determine the mean absolute deviation for when any ice was present. How can the men’s deviation be improved?
Inspire science notebook (energy in atmosphere) page 36
Answer: Clarify your question please.
Explanation:
I'm sorry, but I need more context to determine the mean absolute deviation for "when any ice was present" and how to improve the men's deviation. Can you provide more details or clarify your question?
don't just look at this and don't answer it ._.
yeah i be seeing you guys view the answer and don't do nothing at all, not even comment IoI...
Perform the following operation
and express the answer in
scientific notation.
3.5x107x 1.8×10-3
[?]
[?]×10
By performing the following operation, the answer in scientific notation for 3.5 x 10⁷x 1.8×10[tex]^-3[/tex]×10 is 6.3×10⁵.
What is scientific notation?Scientific notation is defined as a way of expressing numbers which are too large or too small so that they can be easily written in decimal form. It can be referred to the scientific form or the scientific index form or even the standard form.
Base ten notation is used by scientists, engineers as it helps in simplification of arithmetic operations. It contains the significant figures which include all non-zero numbers , the zeroes between significant digits and zeroes which are needed to be significant.
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Consider the reaction:
2N2O (g) = 2N2 (g) + O2 (g)
A. Express the rate of the reaction with respect to each of the reactants and products.
B. In the first 15.0 s of the reaction, 0.015 mol of O2 is produced in a reaction vessel with a volume of 0.500 L. What is the average rate of the reaction over this time interval.
C. Predict the rate of change in the concentration of N2O over this time interval. In other words, what is [N2O]/t?
A. The rate of the reaction with respect to each of the reactants and products is given by:
Rate = -1/2 Δ[N2O]/Δt = 1/2 Δ[N2]/Δt = Δ[O2]/Δt
Note that the negative sign in the rate of change of N2O is due to the fact that the concentration of N2O is decreasing with time, while the positive signs for the other two rates indicate that the concentrations of N2 and O2 are increasing with time.
B. The average rate of the reaction over the first 15.0 s can be calculated by dividing the change in the concentration of O2 by the time interval:
Average rate of reaction = Δ[O2]/Δt = (0.015 mol)/(15.0 s) = 0.001 mol/s
Note that the reaction is given in terms of moles of O2 produced, so we can directly use the change in the concentration of O2 to calculate the rate.
C. The rate of change in the concentration of N2O over the first 15.0 s can be predicted using the rate expression:
Rate = -1/2 Δ[N2O]/Δt
We can rearrange this equation to solve for the rate of change in the concentration of N2O:
Δ[N2O]/Δt = -2 × Rate
Substituting the average rate of reaction calculated in part B, we get:
Δ[N2O]/Δt = -2 × 0.001 mol/s = -0.002 mol/s
This indicates that the concentration of N2O is decreasing at a rate of 0.002 mol/s over the first 15.0 s of the reaction.
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5. What criteria are used to distinguish between a chemical change and a physical
change?
In chemical change, the chemical composition of substance changes while in physical changes the chemical composition remains the same.
What are chemical changes?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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suppose a student starts with 2.3816 g of a sand mixtrue and separates the components into 1.3012 g of nacl, 0.5809 g of sio2, and 0.4503 g of caco3. based on the amount of recovered sio2, what is the percent of sio2 in the starting mixture
The total mass of the concentration obtained (1.3012 g of NaCl + 0.5809 g of SiO2 + 0.4503 g of CaCO3) is 2.3324 g.
The mass of SiO2 recovered is 0.5809 g.
To calculate the percentage of SiO2 in the starting mixture, we divide the mass of SiO2 by the total mass of the mixture and multiply by 100:
(0.5809 g / 2.3816 g) x 100% = 24.4%
Therefore, the starting mixture was approximately 24.4% SiO2.
this assumes that the separation process was complete and all the SiO2 was recovered. In practice, there may be some loss of material during the separation process.the student started with a mixture of sand containing different components, and after separation, the mass of each component was determined. The percentage of SiO2 in the starting mixture can be calculated using the mass of SiO2 recovered and the initial mass of the mixture.
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Find the oxidation number
please help
The oxidation number of the given elements in the compound is:
Mn in MnO₂ is +4Mn in KMnO₄ is +7K in KBr is + 1.What is oxidation number?An element's oxidation number is the number assigned to it in a chemical combination. The number of electrons that atoms in a molecule can share, lose or gain while forming chemical connections with other atoms of a different element is known as the oxidation number.
The oxidation number of elements in the compounds is calculated as follows:
Mn in MnO₂: Mn + (-2 * 2) = 0
Mn - 4 = 0
Mn = +4
Mn in KMnO₄: Mn + (+1) + (-2 * 4) = 0
Mn - 7 = 0
Mn = +7
K in KBr: K + (-) = )
K - 1 = 0
K = + 1.
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What is the chemical formula for water?
Answer:
H2O
Explanation:
Answer:
H2O
Explanation:
The chemical formula for water is H2O, meaning it is made up of 2 hydrogen atoms and 1 oxygen atom.
The element lithium has two naturally occurring isotopes. One of these has a mass of 6. 0151 amu and a natural abundance of 7. 49%. A second isotope has a mass of 7. 0160 amu and a natural abundance of 92. 51%. Calculate the atomic mass of lithium. Enter your answer in the provided box
The element lithium has two naturally occurring isotopes. Lithium i.e. (Li) have a atomic mass of value 6.94 amu.
To calculate the atomic mass of lithium, we need to find the weighted average of the masses of its two isotopes based on their natural abundance. The formula for this calculation is:
[tex]Atomic mass = (mass of isotope 1 * abundance of isotope 1) + (mass of isotope 2 * abundance of isotope 2)[/tex]
Putting values for two isotopes of lithium:-
[tex]Atomic mass = (6.0151 amu * 0.0749) + (7.0160 amu * 0.9251)[/tex]
[tex]Atomic mass = 0.4497595 + 6.487676[/tex]
[tex]Atomic mass = 6.937435 amu[/tex]
Hence, the atomic mass of lithium is approx. 6.94 amu.
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What is the total pressure?
What is the partial pressure of Cl2?
The partial pressure of Cl2 is calculated by taking the chemical equation that is mentioned below. In an equilibrium mixture at 500 K, the partial pressure of PCl5 is 0.860 atm and that of PCl3 is 0.350 atm.
The partial pressure of Cl2 at equilibrium is. Q. 'a' mol of PCl5 undergoes thermal dissociation as-
PCl5⇌PCl3+Cl2;
the mole fraction PCl3 at equilibrium is 0.25 and the total pressure is 2 atm. The partial pressure can be calculated as follows: P(gas 1) = x(gas 1) * P(Total); where x(gas 1) = no of moles(gas 1)/ no of moles(total). As you can see the above formulae does not require the individual volumes of the gases or the total volume.
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What is molar ratio of Mg reacted to H2 produced? what is the stoichiometric ratio between the mg ribbon reactant and the hydrogen gas product?
The molar ratio of Mg reacted to H2 produced is 1:1. This means that for every mole of Mg that reacts, one mole of H2 is produced. The stoichiometric ratio between the Mg ribbon reactant and the hydrogen gas product is also 1:1.
This ratio is determined by the balanced chemical equation for the reaction between Mg and HCl, which is Mg + 2HCl → MgCl2 + H2. The coefficients in this equation represent the number of moles of each reactant and product that are involved in the reaction. The coefficient for Mg is 1, indicating that one mole of Mg reacts with two moles of HCl to produce one mole of H2 and one mole of MgCl2.
The stoichiometric ratio is important because it allows us to determine the number of reactants or products needed in a reaction. For example, if we know the amount of Mg we have, we can use the stoichiometric ratio to calculate the amount of H2 that will be produced. Similarly, if we know the amount of H2 we need, we can use the stoichiometric ratio to determine how much Mg we need to react with HCl to produce the required amount of H2.
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The combustion of butane in oxygen (air) is represented in the equation 2c_4H
The combustion of butane in oxygen (air) is represented in the balanced chemical equation as 2 C₄H₁₀ + 13 O₂[tex]\rightarrow[/tex] 8 CO₂ + 10 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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Your question is incomplete but most probably your full question was:The combustion of butane in oxygen (air) is represented in the equation 2 C₄H₁₀ + 13 O₂[tex]\rightarrow[/tex]
1. Which of the following is an example of chemical energy being converted into another form?
A. Paper being torn
OB. Heating cold water
C. Burning a log in a fireplace
D. A roller coaster going downhill
Answer:
C. Burning a log in a fireplace
Explanation:
Chemical energy is stored in the bonds between atoms and molecules and can be converted into another form of energy. This can occur through chemical reactions, such as combustion or decay.
An example of chemical energy being converted into another form is option C: Burning a log in a fireplace. In this example, the chemical energy stored in the wood is released through combustion, producing heat and light. The heat energy is then transferred to the surrounding air and environment, warming it up.
This is different from options A and B, which involve physical changes but not the conversion of chemical energy. Option D, a roller coaster going downhill, is an example of potential energy being converted into kinetic energy, but not of chemical energy being converted.
ALLEN
according to the first law of thermodynamics, what can and cannot happen to energy?
According to the first law of thermodynamics, energy can be transferred from one system to another or transformed from one form to another, but it cannot be created or destroyed.
The first law of thermodynamics is also known as the law of conservation of energy. In short, the law states that the amount of energy is and will always be constant, as it can't be created or destroyed.
For example, when a car engine burns gasoline, the chemical energy in the gasoline is transformed into thermal energy (heat) and mechanical energy (motion). The total amount of energy in the system remains the same, but it is transformed into different forms.
Similarly, when you lift a weight, you transfer energy from your muscles to the weight, causing it to move. The total amount of energy in the system remains the same, but it is transferred from one object to another.
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Convert 2.55 moles of calcium chloride to grams.
CaCl2
Answer:
283.1g CaCl2
Explanation:
Use Molar Mass of CaCl2 and convert.
2.55molsCaCl2 x 111g/1mol = 283.1g CaCl2
what is the mass of 3.01x10^24 water molecules?
Answer:The mass of a single water molecule can be calculated using its molecular formula, H2O. The molecular weight of water is 18.015 g/mol.If we have 3.01 x 10^24 water molecules, the total mass can be calculated as follows:Mass = Number of water molecules * Molecular weight of waterMass = 3.01 x 10^24 * 18.015 g/molMass = 5.45 x 10^25 gSo, the mass of 3.01 x 10^24 water molecules is approximately 5.45 x 10^25 grams.
what type of bonding involves the transfer of electrons to form cations and anions?
The bonding that involves the transfer of electrons to form cations and anions is known as ionic bonding.
Ionic bond, additionally known as electrovalent bond, form of linkage fashioned from the electrostatic appeal among oppositely charged ions in a chemical compound. Such a bond paperwork while the valence (outermost) electrons of 1 atom are transferred completely to some other atom. Ionic bonding is the entire switch of valence electron(s) among atoms. It is a form of chemical bond that generates oppositely charged ions. In ionic bonds, the steel loses electrons to emerge as a undoubtedly charged cation, while the nonmetal accepts the ones electrons to emerge as a negatively charged anion.
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The formulae of two compounds of manganese are MnO2 and KMnO4. What are the oxidation state of manganese in each of these two compounds?
( oxidation state of K: +1 oxidation state of oxygen: -2 )
Answer:
The oxidation state of manganese in MnO2 is +4 and in KMnO4 is +7. This can be determined by using the oxidation states of K (+1) and oxygen (-2) in KMnO4 and the fact that the sum of the oxidation states of all the elements in a neutral compound must be zero. Since there are four oxygen atoms in KMnO4, their total contribution to the oxidation state is -8. To balance this, the oxidation state of manganese must be +7, which means it has been oxidized from +4 in MnO2 to +7 in KMnO4.
Explanation:
