Answer:
21% percent
Explanation:
Air has small amounts of other gases, such as carbon dioxide,neon, and hydrogen. Oxygen shares some parts of air basically. The highest percentage of oxygen we can breathe is approximately 60℅
What is another example, in real life, where we can prove that gases exist even though we can not see them? Explain why you believe this is a good example.
Well, us human being rely on [tex]o_{2}[/tex] (oxygen). We human beings breathe this in every day because we need it to survive. This is a good example because it explains how humans don't see [tex]o_{2}[/tex] but use it every day.
5. What measures how stressful exercise is on your body?
O A. Frequency
O B. Duration
O C. Volume
D. Intensity
Answer: D. Intensity
Explanation: Intensity is correct, because if you originally were working on a treadmill with a speed of 8, that is how much intensity your putting your body on. And if you put the speed for a treadmill at 11 to increase your exercise, you are increasing the speed you have to run, making it more intense. The more intense you make your workout or training, the more stressful exercise you are doing.
Hope this helps,
:)
How many liters are in a 6M solution containing 17 moles?
Answer: There are 102,000,000 liters in the container.
Do you think these portions of the DNA get transcribed? (JUNK DNA) Why or why not?
Pls needed answer asap thnku smmm
Yes, a research in 2012 called the ENCODE project showed that about 75% of noncoding DNA or Junk DNA do get transcribed.
What is Junk DNA?The term "Junk DNA" is often used to refer to regions of the DNA that do not appear to code for functional genes, and their function or lack thereof is still a subject of active research and debate in the scientific community.
While it was once believed that these non-coding regions of DNA were "junk" and had no functional role, recent research has shown that some of these regions may have important regulatory functions, such as controlling gene expression or modulating chromosome structure.
In 2012, the ENCODE project determined that around three-quarters of the noncoding DNA in the human genome did undertake transcription and that almost half of the genome was accessible to proteins involved in genetic control such as transcription factors.
Some scientists, however, have questioned these findings, claiming that the accessibility of these genomic sequences to transcription factors does not necessarily imply that they have any biochemical significance or that transcription of the segments is favorable in terms of evolution.
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Indicate the type of intermolecular forces hold liquid nitrogen (N2) together?
Answer:
Nitrogen liquefies at -195.8°C at room temperature.
At -182.95°C, the periodic table equivalent (oxygen) boils.
The boiling point of nitrogen is lower because there are fewer interactions between nitrogen molecules (N2).
The degree of electron fluctuation within a molecule affects interactions between non-polar molecules.
Van der Waals forces are the oldest sort of intermolecular contact, named after Dutch chemist Johannes van der Waals.
The Van der Waals forces, which include dipole-dipole and dispersion forces, are the weakest intermolecular forces.
Which term is defined as the ability to dissolve within a given solvent?
O solution
O solubility
O dissociating
O dissolving
20pts
Answer:
Solubility.
Explanation:
Solubility is the maximum concentration of a solute that can dissolve in a solvent at a given temperature. At the maximum concentration of solute, the solution is said to be saturated. The units of solubility can be provided in mol/L or g/L.
Match these
Hypothesis
Independent Variable
Conclusion
Amount of water
if a plant receives more water it will grow more
100mL of water yielded the highest mass and height of plants
The conclusion is the result of the experiment, which supports the hypothesis by stating that 100mL of water yielded the highest mass and height of plants.
Hypothesis: If a plant receives more water, it will grow more.
Independent Variable: Amount of water.
Conclusion: 100mL of water yielded the highest mass and height of plants.
In this experiment, Hypothesis states the relationship between the independent variable and the dependent variable. The independent variable is the amount of water, and the dependent variable is the growth of the plants.
The conclusion is the result of the experiment, which supports the hypothesis by stating that 100mL of water yielded the highest mass and height of plants.
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A block of aluminum occupies a volume of 28.0 mL and weighs 85.7g. What is its density?
Explanation:
The density of a substance is defined as its mass per unit volume. In this problem, we are given the volume and the mass of the aluminum block, so we can calculate its density as follows:
Density = Mass / Volume
Substituting the given values, we get:
Density = 85.7 g / 28.0 mL
Simplifying this expression, we get:
Density = 3.06 g/mL
Therefore, the density of the aluminum block is 3.06 g/mL
Answer:
3.06
Explanation:
The Kp for the reaction A (g) ⇌ 2 B (g) is 0.0110. What is Kp for the reaction 2 B (g) ⇌ A (g)?
there are several elements whose atoms make more than one type of ion. Where in
the periodic table are these elements usually found?
Answer:
Explanation:
These are the transition metals. Groups 3-12 also know as the "d" block elements
An isotope of hydrogen, known as Tritium (hydrogen-3), has a half-life of 12 years. If a sample of tritium was prepared 60 years ago, what was its original mass if its current mass is 0.42 micrograms?
Options for answers:
a.) 1.7mg b.) 13.4mg c.) 6.7mg d.) 26.8mg e.) 3.4mg
The original mass of Tritium (hydrogen-3) was 13.4mg if its current mass is 0.42 micrograms.
The formula for radioactive decay is given by:
N = N0 x (1/2)^(t/T)
where,
N = final number of radioactive atoms
N0 = initial number of radioactive atoms
t = time elapsed
T = half-life of the radioactive substance
Let's substitute the given values into the formula:
0.42 μg = N0 x (1/2)^(60/12)
0.42 μg = N0 x (1/2)^5
0.42 μg = N0 x 1/32
N0 = 0.42 μg x 32
N0 = 13.44 μg
Therefore, the original mass of the tritium sample was 13.44 micrograms.
What is radioactive decay?
Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting ionizing radiation, such as alpha particles, beta particles, and gamma rays. This process can result in a change in the number of protons and/or neutrons in the nucleus, leading to the transformation of one element into another. The rate of decay is typically characterized by a half-life, which is the time required for half of the atoms in a sample to decay.
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NEEDD HELP URGENTLY, NOBODY ELSE IS HELPING FFS
2.0 mol of Ca(OH)2 are mixed with 2.0 mol of HCl according to the following equation:
Ca(OH)2+2HCl=CaCl2+2H2O
a. Which chemical is in excess and which is limiting reactant?
b. What is the excess in grams?
c.Theoretically,how many moles of H20 will be produced?
Answer:
Explanation:
Limiting is HCl and excess is Ca(OH)2
excess is 296 grams Ca(OH)2
2 moles H2O will be formed
pls help!!
Which statement best describes the difference between speed and velocity?
A.
Velocity is plotted on the x-axis of a graph and speed is plotted on the y-axis.
B.
Velocity is related to position but speed is not.
C.
Velocity does not depend on time but speed does.
D.
Velocity has a specific direction but speed does not.
Answer:
option a
Velocity is plotted on the x-axis of a graph and speed is plotted on the y-axis.
18. If we increase the temperature of the tank to 85° C, what will the new pressure be inside the tank?
The new pressure inside the tank would be approximately 101.8 kPa.
What is the relationship between temperature and pressure of a gas?
According to the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature in Kelvin.Since the volume of the tank is constant, we can use the simplified form of the ideal gas law: P1/T1 = P2/T2, where P1 is the initial pressure, T1 is the initial temperature, P2 is the final pressure, and T2 is the final temperature.Converting 85° C to Kelvin (85 + 273.15 = 358.15 K), we can solve for P2: P2 = P1(T2/T1) = 101.3 kPa (358.15 K / 298.15 K) = 101.8 kPa.Increasing the temperature of the tank to 85° C would result in a new pressure inside the tank of approximately 101.8 kPa.
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Esters, amines, and amides have many uses in medicine. Investigate one of the following drugs further: aspirin, Benadryl, or Tylenol and give its scientific name. What kind of functional groups does it contain?
Esters, amines, and amides have many uses in medicine, and so do carboxylic acids, such as aspirin. Aspirin is the drug that will be investigated further. Its scientific name is acetylsalicylic acid.
What kind of functional groups does Aspirin contain?Acetylsalicylic acid contains two functional groups: a carboxylic acid group (-COOH) and an ester group (-COO-CH₃). The carboxylic acid group is responsible for the acidic properties of aspirin and allows it to form salts with bases. The ester group is formed from the reaction between the carboxylic acid group of salicylic acid and acetic anhydride. This esterification reaction makes aspirin more soluble in organic solvents and less irritating to the stomach than salicylic acid.
Aspirin is a widely used medication that has anti-inflammatory, analgesic, and antipyretic properties. It works by inhibiting the production of prostaglandins, which are responsible for pain, inflammation, and fever. Aspirin is commonly used to treat headaches, fever, arthritis, and other inflammatory conditions. It is also used as a blood thinner to prevent heart attacks and strokes.
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A + B = AB is an example of a ________reaction
Answer:
A + B = AB is an example of a synthesis reaction
Explanation:
I have included an overview of the topics you MUST include in your presentation.
Topic Outlines:
Biomass (10 points)
1. What does “Biomass” mean? How is Biomass being used today as a substitute for gasoline to run cars, trucks or buses?
2. What are some different ways Biomass is being used to heat homes today?
3. Name and explain 3 advantages/disadvantages in using Biomass compared to using Fossil Fuels or other alternative energies (specifically include environmental issues that can happen).
4. Explain the energy conversions when producing energy with Biomass. (Use the words: Potential Energy and Kinetic Energy).
Geothermal (10 point)
5. Where does geothermal energy come from?
6. How can geothermal energy be used to create electricity?
7. How can geothermal energy be used directly to heat homes and factories?
8. What is a “heat pump”?
9. Name and explain 3 advantages and disadvantages in using geothermal energy compared to using fossil fuels and other alternative energies. (Specifically include environmental issues that can happen).
Hydroelectric (10 points)
10. What is a good definition of hydroelectric power?
11. How does “moving water” get turned into electrical energy? Explain each part of the dam from the moving water to production of electricity.
12. Name and explain 3 advantages/disadvantages of getting electricity from hydroelectric power and how it compares to using fossil fuels or alternative energies. (specifically include environmental issues that can happen
13. Find one example in the U.S. that uses hydroelectric power to create electricity?
1. Its renewable nature,
2. Its potential to reduce greenhouse gas emissions and dependence on fossil fuels, and
3. Its ability to provide local sources of energy.
Disadvantages include:1. The high cost of production and transportation
2. The potential for deforestation and habitat loss
3. The release of pollutants and greenhouse gases during combustion
When producing energy with biomass, the potential energy stored in the organic matter is converted into kinetic energy by burning it or using other processes, such as gasification or pyrolysis, to release the energy. This kinetic energy can then be harnessed to generate electricity, heat, or fuel.Geothermal energy comes from the heat that is generated from the Earth's core and mantle.Geothermal energy can be used to create electricity by drilling wells into the Earth's crust and pumping hot water or steam to the surface, which can then drive turbines that generate electricity.Geothermal energy can be used directly to heat homes and factories by circulating hot water or steam through pipes or using geothermal heat pumps.A heat pump is a device that transfers heat from one place to another, such as from the ground to a building's heating system, by using a refrigerant to absorb and release heat.Advantages of using geothermal energy include:1. its low emissions and high efficiency,
2. its reliability and consistency,
3. its potential for use in remote areas.
Disadvantages include:1. the high upfront cost of installation,
2. the potential for depletion of geothermal reservoirs,
3. the risk of earthquakes and other geological hazards.
Hydroelectric power is a form of renewable energy that harnesses the power of moving water to generate electricity.Moving water is channeled through a dam, which drives turbines that spin generators to produce electricity. The water is then released back into the river or diverted to another body of water. The dam also serves to regulate the flow of water and prevent flooding.Advantages of using hydroelectric power include:its renewable nature, its potential for reliable and consistent power generation its ability to provide flood control and irrigation. Disadvantages include: the disruption of aquatic ecosystems, the potential for methane emissions from flooded land, the high upfront costs of building dams and other infrastructure.Hoover Dam, located on the Colorado River on the border between Arizona and Nevada, is a major example of a hydroelectric power plant in the U.SWhat is the history of hydroelectric power?The history of hydroelectric power dates back to the 19th century, with the development of water turbines and generators. The first hydroelectric power plant was built in Appleton, Wisconsin in 1882, by a man named H.J. Rogers.
However, the concept of using water to produce mechanical power had been around for centuries. In ancient times, waterwheels were used to power mills and other machinery, and in the Middle Ages, water power was used to operate various devices, such as water pumps, sawmills, and hammers.
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A sample of gas is in a container with a movable piston. The volume in the container is originally 850 ML at a temperature of 467K and a pressure of 11 point 4K PA. What will the new temperature if the volume is expanded to 1125 in El with a new pressure of 99.7 K PA?
If the volume is increased to 1125 in El with a new pressure of 99.7 K PA, the new temperature will be around 808 K.
What transpires to the gas volume in a moveable piston cylinder?Once the piston's pressure has doubled, it goes downward until the gas's pressure and the piston pressure are equal. The gas has now lost half of its original volume. The volume of gas falls to one-fourth of its initial volume if the pressure on the piston is once more increased by a factor of two.
This issue can be resolved using the coupled gas law:
(P1V1) / T1 = (P2V2) / T2
Using the following conversions, we can first change the starting volume to litres and the original pressure to atmospheres (atm):
1 mL = 0.001 L
1 kPa = 0.00987 atm
V1 = 850 mL = 0.85 L
P1 = 11.4 kPa = 0.1126 atm
T1 = 467 K
The new volume and pressure can also be converted to litres and atmospheres:
V2 = 1125 mL = 1.125 L
P2 = 99.7 kPa = 0.984 atm
Now we can plug in the values and solve for T2:
(P1V1) / T1 = (P2V2) / T2
(0.1126 atm * 0.85 L) / 467 K = (0.984 atm * 1.125 L) / T2
T2 = (0.984 atm * 1.125 L * 467 K) / (0.1126 atm * 0.85 L)
T2 = 808 K
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Answer:
548 K
I hope this helps! Cheers ^^
Help please
2.0 mol of Ca(OH)2 are mixed with 2.0 mol of HCl according to the following equation:
Ca(OH)2+2HCl=CaCl2+2H2O
a. Which chemical is in excess and which is limiting reactant?
b. What is the excess in grams?
c.Theoretically, how many moles of H2O will be produced?
Answer:
Explanation:
Limiting is HCl and excess is Ca(OH)2
excess is 296 grams Ca(OH)2
2 moles H2O will be formed
dry ice is solid carbon dioxide. represent carbon dioxide in the following three ways, symbolic, particulate. and macroscopic
In symbol form, ice is depicted as CO2, in particle form, as molecules of CO2 packed closely together, and in macroscopical form, as a white, crystalline substance that sublimates from a solid to a gas.
How is dry ice defined as solid carbon dioxide?Because the gas when it solidifies resembles ice, ice ice is actually just carbon dioxide that has been solidified. Unlike regular ice, it instantly transforms into CO2 gas instead of melting into a liquid.
Why is dry ice a good illustration of sublimation?Solid carbon dioxide is sometimes referred to as "dry ice." That's because when something warms up and changes state, it doesn't just dissolve into a liquid. Instead, it skips the liquid step and transforms right into a gas.
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The enthalpy of vaporization for water is 40.7 kJ/mol. Water has a vapor pressure of 101.3 kPa at 100.0 oC. Using the Clausius-Clapeyron equation, what is the vapor pressure for methanol at 77.2 oC?
Can someone help me do a CER 8-10 sentences
Yes, shining light on metal can cause it to get warm, regardless of the type of light used. When light strikes surface, some of its energy is absorbed by material, which causes atoms to vibrate, leading to increase in material's temperature and this effect is known as thermal radiation.
Does it matter what type of light shines on the meta?The amount of heat generated depends on several factors, including the intensity of light, duration of exposure, and material's properties, such as its reflectivity, emissivity and specific heat capacity.
I case of the metal used to make satellites, it absorbs infrared light, which means that it will be heated up if exposed to this type of light. However, metal transmits X-ray light and reflects visible light, so it will not be heated by these types of light.
Therefore, it is essential to consider type of light used when assessing heat generated by material. Different materials have different spectral responses to light, which means that they will absorb, reflect or transmit different types of light, and as a result, they will behave differently when exposed to light.
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!!(100 points)!! For each of the following chemical formulas, identify the elements present and the number of atoms of each element present in each molecule of the substance: H2SO4, Ca(NO3)2
Answer:
H2SO4 Chemical Name
It contains two atoms of hydrogen, one atom of sulphur, and four atoms of oxygen. It has an atomicity of seven.
Calcium Nitrate is made up of three different elements and contains a total of nine atoms. This compound's formula is Ca(NO3)2. There is one calcium atom, two nitrogen atoms, and there are six oxygen atoms in calcium nitrate.
Carbon dioxide is an example of a greenhouse gas. Levels of carbon dioxide are increasing in the atmosphere. How are increasing levels of carbon dioxide affecting the atmosphere?
Select the two correct awnsers.
1.less water is evaporating from the oceans
2. Earthquakes and volcanic eruptions are becoming more frequent
3.patterns of rain and snow are changing
4.ice caps are becoming thicker and wider at the North Pole and South Pole
5.oceans waters are becoming warmer
Global warming brought on by rising carbon dioxide concentrations in the atmosphere is changing weather patterns and ocean temperatures. Changes in precipitation patterns are being brought on by the warming of the atmosphere.
Why does carbon dioxide serve as a representative greenhouse gas?Because it is one of the gases in the atmosphere that causes the greenhouse effect, which causes the Earth to warm, carbon dioxide is known as a greenhouse gas. Long-wavelength infrared radiation (heat) from the Earth is absorbed by carbon dioxide molecules in the atmosphere, and some of it is then radiated back downward.
What impact does an increase in atmospheric carbon dioxide have?Similarly, as air temperatures rise in response to rising carbon dioxide concentrations, more water vapor escapes into the atmosphere—which then amplifies greenhouse heating
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If only 1600 grams of CO2 are produced, what is the percent error of this reaction?
Answer:
Explanation:
MTBE (C5H12O)
How many milliliters of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 m HNO3? _____mL
Answer: Therefore, 70.7 mL of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 M HNO3.
Explanation:
To prepare 3.50 L of 0.200 M HNO3, we need to calculate the amount of HNO3 required and then determine the volume of 9.89 M nitric acid solution needed to prepare this amount of HNO3.
The amount of HNO3 required can be calculated using the formula:
amount of HNO3 (in moles) = volume of solution (in liters) x concentration of HNO3 (in moles per liter)
Substituting the given values:
amount of HNO3 = 3.50 L x 0.200 mol/L = 0.700 mol
Now, we can use the amount of HNO3 and the concentration of the nitric acid solution to calculate the volume of the nitric acid solution needed:
volume of nitric acid solution = amount of HNO3 (in moles) / concentration of nitric acid solution (in moles per liter)
Substituting the given values:
volume of nitric acid solution = 0.700 mol / 9.89 mol/L = 0.0707 L
Finally, we can convert the volume to milliliters:
volume of nitric acid solution = 0.0707 L x 1000 mL/L = 70.7 mL
Therefore, 70.7 mL of 9.89 M nitric acid solution should be used to prepare 3.50 L of 0.200 M HNO3.
Regenerate response
If I have 4 moles of a gas pressure of 5.6 atm and a volume of 12 liters what is the temperature
Answer: 204.63 K
Explanation:
Ideal gas law
Pv=nRT
T=PV/nR
T= 5.6 X 12/(4 x0.0821)= 204.63 K
R= ideal gas constant = 0.0821
What periodic trend does the atomic radius follow? A. It increases from left to right. B. It decreases from top to bottom. C. It stays the same across the table. D. It decreases from left to right.
Answer: D
Explanation:
It increases from right to left and down the periodic table. So your answ3er would be D. that it is decreasing from left to right.
A mixture of 0.2000 mol of CO2, 0.1000 mol of H2 and 0.1600 mol of H2O is placed in a 2.000 L vessel. The following equilibrium is established: CO2(g) + H2(g) ⇌ CO(g) + H2O(g) At equilibrium [H2O] = 0.0856 M. a. Calculate the equilibrium concentrations of CO2, H2 and CO. b. Calculate Kc for the reaction
The equilibrium concentrations of CO₂, H₂, and CO are 0.170 M, 0.084 M, and 0.016 M, respectively.
The equilibrium amounts, what are they?Making an equilibrium concentration calculation. A chemical reaction is said to be in a state of chemical equilibrium when both the reactants and the products are in a concentration that does not vary over time any longer.
The reaction's equilibrium constant formula is as follows:
Kc = ([CO][H₂O])/([CO₂][H₂])
We obtain the following by plugging in the equilibrium amounts from the ICE table:
Kc = ((x)(0.0856))/((0.20 - x)(0.10 - x))
b. In order to determine Kc, we must first determine x using the equilibrium formula and the specified equilibrium H₂O concentration:
Kc = ((x)(0.0856))/((0.20 - x)(0.10 - x)
Kc = (x(0.0856))/(0.02 - 0.3x + x - 0.01x)
Kc = (x(0.0856))/(0.02 - 0.21x)
Kc(0.02 - 0.21x) = 0.0856x
0.02Kc - 0.21Kcx = 0.0856x
0.21Kcx + 0.0856x = 0.02Kc
x(0.21Kc + 0.0856) = 0.02Kc
x = (0.02Kc)/(0.21Kc + 0.0856)
x = (0.02Kc)/(0.21Kc + 0.0856
After solving for the equilibrium concentrations of CO₂, H₂, and CO and substituting this equation for x back into the ICE table, we arrive at:
[CO₂] = 0.170 M
[H₂] = 0.084 M
[CO] = 0.016 M
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The balance the following equation. Show all of your work using the atom inventory method:
____Cr(MnO4)3 + ____Sr(OH)2 → ____Cr(OH)3 + ____Sr(MnO4)2
The balanced equation is:
Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2
Balancing chemical equation.To balance this equation using the atom inventory method, we need to make sure that the number of each type of atom is the same on both sides of the equation.
Let's start by looking at the left-hand side of the equation:
Cr(MnO4)3 + Sr(OH)2
We can see that there is one chromium (Cr) atom, three manganese (Mn) atoms, and 12 oxygen (O) atoms on the left-hand side.
Now let's look at the right-hand side of the equation:
Cr(OH)3 + Sr(MnO4)2
Here we have one chromium (Cr) atom, two manganese (Mn) atoms, and 14 oxygen (O) atoms.
So, we need to balance the equation by adding coefficients (numbers in front of each chemical formula) to make sure the number of each type of atom is the same on both sides.
Let's start by balancing the chromium (Cr) atoms:
Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + Sr(MnO4)2
Now we have one chromium atom on both sides.
Next, let's balance the manganese (Mn) atoms:
Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + Sr(MnO4)2
We have three Mn atoms on the left-hand side, but only two on the right-hand side. To balance this, we need to add a coefficient of 2 in front of Sr(MnO4)2:
Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + 2Sr(MnO4)2
Now we have two Mn atoms on both sides.
Finally, let's balance the oxygen (O) atoms:
Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + 2Sr(MnO4)2
We have 12 O atoms on the left-hand side, but 20 O atoms on the right-hand side. To balance this, we need to add a coefficient of 5 in front of Cr(OH)3:
Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2
Now we have 12 O atoms on both sides.
So the balanced equation is:
Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2
Therefore, the coefficients are:
Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2.
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