74.5 gram of Fe₂O₃ is formed from 22.4 g of O2
The balanced equation of the reaction is
4 Fe + 3 O₂ → 2 Fe₂O₃
4 moles of Fe and 3 moles of O₂ gives 2 moles of Fe₂O₃
Number of moles in 22.4g of O₂ = Given mass / molar mass [Molar mass of O₂ = 32]
= 22.4 / 32
= 0.7 moles
We know that, 3 moles of oxygen form 2 moles of Fe₂O₃
0.7 moles of O₂ form [(2/3) * 0.7] = 0.47 moles of Fe₂O₃
Thus, mass of Fe₂O₃ = number of moles * molar mass [Molar mass of Fe₂O₃ = 159.69]
= 0.47 * 159.69
= 74.5 grams of Fe₂O₃
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What is the molarity of a CaCl2 solution that is prepared by dissolving 27.1 g of CaCl2 in sufficient water to give 779 mL of solution?
The molarity of a CaCl₂ solution that is prepared by dissolving 27.1 g of CaCl₂ in sufficient water to give 779 mL of solution is 0.31M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of a substance can be calculated by dividing the number of moles of the substance by the volume.
According to this question, 27.1 g of CaCl₂ is dissolved in sufficient water. The number of moles can be calculated as follows:
moles = 27.1g ÷ 110.98 g/mol
moles = 0.24mol
Molarity of CaCl₂ = 0.24mol ÷ 0.779L
Molarity of CaCl₂ = 0.31M
Therefore, 0.31M is the concentration required to prepare by dissolving 27.1 g of CaCl₂ in sufficient water.
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The following graph shows water solubility of some salts versus temperature
(In g of salt/ 100 g water)
Which curve of curves on the chart shows the melt that has the largest solution temperature (with a positive sign) and why?
The following graph shows water solubility of some salts versus temperature curves on the chart shows the melt that has the largest solution temperature is the curve b
Water solubility is the because of its polarity and ability to form hydrogen bonds and also water makes an excellent solvent means it can dissolve so many kind of molecules
Here given graph shows water solubility of some salts versus temperature and in that curve a, c and d show the low temperature but b curve show almost high temperature and that's why the melt that has the largest solution temperature and also has a positive sign and curve c and d are show constant water solubility and curve b shoe first high then low and then more high that's why the curve b has the largest temperature
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What is chemistry in science
Answer:
What does chemistry mean in science?
Chemistry is a branch of natural science that deals principally with the properties of substances, the changes they undergo, and the natural laws that describe these changes.
Explanation:
What are the first and second net ionic equations for the addition of aqueous ammonia to aluminum nitrate?
the answer should include 2 separate NIEs
keep in mind that after adding aqueous ammonia to aluminum nitrate and seeing the suspended precipitate form, we then centrifuged the solution and the precipitate settled at the bottom of the tube.
Answer:
Explanation:
i dont kow
The complete ionic equation and the net ionic equation for the reaction of aqueous ammonia and aluminum nitrate is written as follows:
[tex]Al^{3+} (aq)+3(NO_{3})^{-}(aq)+3NH_{4}^{+} (aq) + OH^{-}(aq)\rightarrow Al(OH)_{3}(s)+3NH_{4}^{+}(aq)+NO_{3}^{-}(aq)[/tex]
[tex]Al^{3+}(aq)+ OH^{-}(aq)\rightarrow Al(OH)_{3}(s)[/tex]
What is ionic equation?In an ionic equation all the ions are charges are balanced to the proper stoichiometric ratio. The states of each species have to be written in the brackets.
The reaction of aluminum nitrate and aqueous ammonia is written as follows:
[tex]Al(NO_{3})_{3}(aq) + 3NH_{4}OH(aq)\rightarrow Al(OH)_{3}(s) +3NH_{4}NO_{3}(aq)[/tex]
The complete ionic equation is written below:
[tex]Al^{3+} (aq)+3(NO_{3})^{-}(aq)+3NH_{4}^{+} (aq) + OH^{-}(aq)\rightarrow Al(OH)_{3}(s)+3NH_{4}^{+}(aq)+NO_{3}^{-}(aq)[/tex]
From this complete ionic equation the net ionic equation can be written by cancelling same species from both side as below:
[tex]Al^{3+}(aq)+ OH^{-}(aq)\rightarrow Al(OH)_{3}(s)[/tex]
Therefore, the net product aluminum hydroxide is precipitated and the net ionic equation is written as above.
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Which statement represents climate ?
According to the given statement Summer are usually hot and dry represent climate.
How would you define climate?Climate is the usual weather observed over a longer period of time in a certain location. A description of a climate includes specifics like the average temperature in each season, how much rain falls, and how much sun there is. Additionally, descriptions of the extreme are common.
Why is the climate important?Nearly every area of our life is impacted by the climate, including our food supplies, transport networks, clothing choices, and vacation destinations. It significantly affects our future, our wellbeing, and our means of subsistence. The long-term pattern of the climate in any given location is called the climate.
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3.7 x 10^24 carbon atoms, how many moles of carbon do you have?
Answer:
6.15 moles
Explanation:
1 mole of C has 6.02 x 10^23 atoms
the number of mole in 3.7 x 10^24 is
(1 mole)(3.7 x 10^24)/(6.02 x 10^23)
= 6.15 moles
For the following reaction:___Ca(NO3)2 + ____Li3PO4 --> ___LiNO3 + ____Ca3(PO4)2a) Determine the balanced equation b) What is the excess reagent for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4?
The question requires us to balance a given reaction and then determine the excess reagent for this same reaction, given that 3.4 moles of Ca(NO3)2 and 2.4 moles of LiPO4 are used.
First, let's balance the equation so we can make the required calculations from it. A simple way to balance this reaction is to start with metals (Li and Ca) and consider the anions NO3 and PO4 instead of the isolated N, O and P atoms:
1) We write the given equation:
___Ca(NO3)2 + ____Li3PO4 --> ___LiNO3 + ____Ca3(PO4)2
2) We check the amount of Ca and Li on both sides of the reaction:
On the left side -> 1 Ca and 3 Li
On the right side -> 3 Ca and 1 Li
3) Then, we change the coefficients in order to have the same amount of Ca and Li on both sides:
3
4) Next, we check the amount of NO3 and PO4 anions:
Left side -> 3*2 NO3 = 6 NO3 and 1 PO4
Right side -> 3*1 NO3 = 3 and 2 PO4
4) We need to adjust some numbers in order to have the same amount of all considered species:
5) At last, we check again:
Left side -> 3 Ca, 6 NO3, 6 Li, 2 PO4
Right side -> 3 Ca, 6 NO3, 6 Li and 2 PO4
a) Then, the balanced reaction is:
1
b) Now that we know the stoichiometric coefficients, we can determine the excess reagent.
From the balanced reaction, we know that we need 3 moles of Ca(NO3)2 to react with 2 moles of Li3PO4. Then, we can write:
3 mol Ca(NO3)2 --------------- 2 mol Li3PO4
3.4 mol Ca(NO3)2 ------------ x
exexcesslimiting (more than 2.27 moles)
We can also determine the excess reactant from the following relation:
y ------------- 2.4 mol Li3PO4
In this case, solving for y, we have that we would need 3.6 moles of Ca(NO3)2 to react with 2.4 moles of Li3PO4, meaning that there is less than required of Ca(NO3)2, thus this is the limiting reactant while Li3PO4 is the excess reactant.
Tricia is investigating a crime. Her supervisor tells her there isn’t enough physical evidence. How can Tricia BEST remedy this issue?
A.
She should talk to witnesses who observed the crime.
B.
She should look for small pieces of hair at the crime scene.
C.
She should use the security camera footage as evidence.
D.
She should include a photo array of suspects in her report.
Since Tricia is investigating a crime, the best form of remedy that Tricia can use to solve this issue is option A. She should talk to witnesses who observed the crime.
What does a witness look like?A witness is said to be a term that is defined as a person who has observed an occurrence or who testifies to what they have observed.
Note that a person who witnesses a robbery as well as testifies in court about what they observed is an example of a witness and they are the best people to get accurate information regarding the crime from.
Hence, option A is correct.
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Answer: A
Explanation:
Electronic Configuration of the
first 50 elements
Answer:
that is some above
Explanation:
because of the chemical reaction
Please help me the density of gasoline is 0.79 g/mL, what mass of gasoline, in kilograms, is in a full
25-gallon tank?
Answer: 74.54kg
Explanation:
Gasoline is 0.79 g/mL
1Kg/1000g x 0.79g/mL x 1000mL/1L x 1L/1.06 quarts x 4 quarts/1gallon x 25 gallons
1 x 0.79 x 1000 x 1 x 4 x 25 divided by 1000 x 1 x 1 x1.06 x 1 =74.54Kg
In an aqueous solution of ethanol, C₂H₅OH, what ions or molecule/s would be present in solution?
In an aqueous solution of ethanol, C₂H₅OH, the molecules that would be present in the solution are ethanol molecules and water molecules.
What are aqueous solutions?Aqueous solutions are solutions containing water as the solvent of the solution.
An aqueous solution simply means dissolved in water.
When dissolved in water, ionic compounds dissociate to form ions in aqueous solutions.
Other polar solutes which are non-ionic will simply dissolve in water as a result of the interaction of the polar ends of the molecules. However, no ions will be formed by these polar non-ionic solutes.
For example, a solution of ethanol in water is a non-ionic aqueous solution.
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Assuming the compound is dissolved in water, what is the formula for phosphorous acid?
Symbol
Name
phosphate
PO
phosphite
phosphorus
0 H3P
0 H3PO4
O HP
0 Hзроз
PO3
P
H3PO3 - is the formula for phosphorous acid
What is Phosphoric acid?Phosphoric acid is a colourless, odourless, solid, inorganic compound containing phosphorus with the chemical formula H3PO. It is usually found as an 85% aqueous solution, which is a colourless, odourless, non-volatile syrupy liquid. Phosphoric acid is part of fertilizers (80% of total use), detergents and many household cleaning products. Diluted solutions have unpleasantly sour taste; As a result, it is also used as an additive to soft drinks and other ready-to-eat foods, imparting acidic properties, and in water purification products.To learn more about Phosphoric acid, visit;
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Answer: the answer is D
Explanation: hope this helps just did it
What is the molar mass of an element that has a mass of 10.4 grams and contains 0.129 moles?
The term mole concept is used here to determine the molar mass of an element. The molar mass of the element is 80.62 g/ mol.
What is a mole?One mole of a substance is that quantity of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon -12. The equation which is used to calculate the number of moles is:
The mass of one mole of molecules of a substance is defined as the molar mass. It is generally expressed in g mol⁻¹
Number of moles = Given mass / Molar mass
Here the given mass of the element is 10.4 g. The number of moles of the element is 0.129 mole. Then the molar mass is:
Molar mass = Given mass / Number of moles
= 10.4 g / 0.129 mol
= 80.62 g/ mol
Thus the molar mass of element is 80.62 g/ mol.
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Why are cats better than dogs?
Answer:
Cats are eazy to take care for and relatively affordable
Answer:
cats r better cuz there cats ovi
Explanation:
there small, easy to take care of, and the are good with kids depending on the breed.
Under improper storage, chlorine bleach decomposes and releases toxic chlorinegas, Cl2(g) What amount of toxic chlorine gas is released from 64mL of bleach at102kPa and 22°C?
We can use the law of ideal gases to solve this question.
The law of ideal gases is represented by the following formula:
[tex]Pv=nRT[/tex]Where P is the pressure, v is the volume, n is the number of moles, R is the ideal gas constant and T is the temperature.
The first step is to convert kPa to atm, °C to K and mL to L.
[tex]102kPa\cdot\frac{1atm}{101.32kPa}=1atm[/tex][tex]\begin{gathered} K=22+273 \\ K=295 \end{gathered}[/tex][tex]64mL\cdot\frac{1L}{1000mL}=0.064L[/tex]Now, we can use these values to find n, which is the amount of moles of the gas:
[tex]\begin{gathered} n=\frac{Pv}{RT} \\ n=\frac{1atm\cdot0.064L}{295K\cdot0.082\cdot\frac{atm\cdot L}{mol\cdot K}} \\ n=0.00264mol \end{gathered}[/tex]The answer is 0.00264 moles of chlorine are released.
How do the particles within a liquid move?o
Answer:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
What is the equation for the base dissociation constant, Kb, of NH3?
NH,(aq)+H,O(l)
The formula for the base dissociation constant (Kb) is Kb = [NH4+][OH-]/[NH3].
Briefing :Kb is a temperature-dependent constant that is typically calculated at 25 degrees Celsius. Ammonia has a Kb value of 1.8E-5 (the notation "E-5" stands for "ten in power -5").
What causes NH3 to dissociate?A basic solution is created when ammonia and water are combined. Ammonium hydroxide is created when a little amount of dissolved ammonia combines with water. This compound then breaks down into ammonium and hydroxide ions.
What is the base dissociation constant?A material that absorbs hydrogen ions or protons in solution is referred to as a base. The base dissociation constant is the equilibrium constant for the equilibrium created when a weak base interacts with water.
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Which of the following has highest boiling points propanol or hexanone?
The compound with the highest boiling point is hexanone. Hexanone has the highest boiling point among the following substances at degree Celsius, and its structure is much more compact than that of the other substances.
Where does a boiling point occur?The temperature at which a liquid's vapor pressure matches that of the surrounding environment's liquid is known as the boiling point. As gas forms below the surface and escapes upwards at this temperature, the liquid starts to bubble.
What makes boiling point important?Important information about an organic compound's structural make-up and physical characteristics can be learned from its boiling point. The boiling point of a chemical can be used to identify and describe the substance. At higher atmospheric pressures, water boils more quickly than it does at lower atmospheric pressures.
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I'm stuck and in need of help.
22. 2 ZnS (s) + 3 O2 (g) → 2 ZnO (s) + 2 SO2 (g)
a. If you have 467.2 g of ZnS, and excess O2, how many moles of SO2 can you form?
The moles of SO₂ formed if you have 467.2 g of ZnS and excess O₂ is 4.79 moles.
The balanced chemical reaction of the give equation is-
2 ZnS(s) + 3 O₂(g) → 2 ZnO(s) + 2 SO₂(g)
What is mole?
Mole is defined as fundamental measurement unit which is used to measure the amount of substance.
Number of moles of ZnS = Given mass
Molar mass
Moles of ZnS = 467.2 g
97.47 g/mol
Moles of ZnS = 4.79 moles
From the reaction, we know that
2 moles of ZnS forms 2 moles of SO₂
4.79 moles of ZnS forms 2 x 4.7 moles of SO₂
2
Moles of SO₂ = 4.79 mol
Hence, the moles of SO₂ can be formed is 4.79 moles.
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What happens when a comet's orbit comes close to the Sun?
A. Its orbit speed up
B. Its orbit slows down
C. It begins to glow
D. It loses its tail
please help me set up the conversion factors + the set up. thank you
Answer:
Guys’ search it up on math thank me later
Explanation:
dhsjdjsusysgtjghtd fjfhfhcchdh
The combustion of propane may be described by the chemical equation
C₂Hg (g) + 5O₂(g) → 3 CO₂(g) + 4H₂O(g)
-
How many grams of O₂(g) are needed to completely burn 27.6 g C3H₂(g)?
According to the given statement 4.64 grams of O₂(g) are needed to completely burn 27.6 g C₃H₂(g).
What is called chemical equation?Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.
Briefing:Mass of C₃H₂ = 27.6 g
Molar mass of C₃H₂ = 38.05 g/mol
Molar mass of O₂= 32 g/mol
We have to calculate the moles of C₃H₂
moles of C₃H₂ = given mass C₃H₂/molar mass C₃H₂
moles of C₃H₂ = 27.6/38.05 = 0.725 mol
We have to calculate the moles of C₃H₂
The balanced chemical equation is:
C₂Hg (g) + 5O₂(g) → 3 CO₂(g) + 4H₂O(g)
From the reaction, we conclude that
As, 1 mole of C₂Hg react with 5 mole of O₂
So, 0.725 mole C₃H₂ of react with 0.725/5 = 0.145 mole of O₂
We have to calculate the mass of O₂
Mass of O₂ = Moles of O₂ * Molar mass of O₂
Mass of O₂ = (0.145moles) * (32g/mol) = 4.64g
The mass of O₂ needed is, 4.64 grams.
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convert from grams to moles for 22gH2O
Answer
Moles = 1.22 moles
Explanation
Given
Mass of water = 22 g
We know the molar mass of water = 18,01528 g/mol
Required: Moles of H2O
Solution
To calculate the number of moles, use
n = m/M where n is the moles, m is the mass and M is the molar mass
n = 22g/18,01528 g/mol
n = 1.22 mol
Answer:mole =22gm/ 18gm = 1.22moles
Explanation:A mole is calculated by dividing the given weight from molecular weight of the compound. In this case Molecular weight of H2O = 18 grams. So answer is 22/18= 1.22
What is the density (in grams/mL) of a solution with
a mass of 5,780.1 ng and a volume of 995 gallons?
(3.7851-1gal, Kilo = 10³)
The density of a solution with a mass of 5,780.1 ng and a volume of 995 gallons is calculated as 5.736. Grams per cubic centimeter can be stated as SI unit of measurement for density.
What are the methods for determining density?Either you have to measure the solid's dimensions or measure the liquid's volume using a measuring jug. To get a number in meters cubed, convert any necessary units.
Further in order to determine the mass of the object or material, place it on a scale.
Explain what density is.Density is the mass of a material or substance that is calculated per unit volume. d = M/V, where d can be stated as density, M as mass, and V as volume, that is the formula for density.
Describe density using an example.The amount of "stuff" is contained in a specific quantity of space is determined by its density. For instance, a block of the harder, lighter element gold (Au) will be denser than a block of the heavier element lead (Pb) (Au).
Styrofoam blocks are less dense than bricks. Mass per unit volume is how it is defined.
Which density types are there?Typically, there are two forms of density: absolute density and relative density. Relative
Density = m/v
= 5780.1/995
= 5.736
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1.000 x 10 3 ml of a solution of H2SO4 made by adding 571.6 g of sulfuric acid to water has a density of 1.3294 g/ml. (molar mass of sulfuric acid is 98.08 g/mol)
What is the molar concentration?
From the calculation, we now obtain the molarity of the sulfuric acid to be 5.8 Mol/L
What is molar concentration?The term concentration is defined as the ratio of the number of moles to the volume of the solution. We know that unit of the molarity of the solution is the moles per liters.
We know the following;
Mass of the acid = 571.6 g
Volume of the acid = 1.000 x 10^3 ml or 1 L
Molar mass of the acid = 98.08 g/mol
Hence;
Number of moles of the acid = 571.6 g/98.08 g/mol = 5.8 moles
Molar concentration of acid = 5.8 moles/ 1 L
= 5.8 Mol/L
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QUICK!
An engineer is determining the effectiveness of a new machine that produces
ammonia from hydrogen and nitrogen. This is an example of which step in
the engineering process?
O A. Manufacture and test a prototype.
O B. Identify solutions to the problem.
O C. Research the problem.
O D. Plan a detailed design.
The engineer determining the effectiveness of a new machine that produces ammonia from hydrogen and nitrogen is an example of a) Manufacturing and testing a prototype.
Ammonia can be obtained using the process called Haber's process. In designing a machine for manufacturing ammonia, a series of steps are to be taken. The first step is to identify the problem and the second is to find solutions to the problem.
To make the solutions obtained to be in practice, the third step includes drafting a strategic plan and design. After obtaining the design the last step is to test the design for its efficiency.
In the case of the machine designed for manufacturing Ammonia, determining the effectiveness of the machine could be tested by manufacturing and testing a sample.
Hence, the correct option is a).
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help me please!!!!!!!!!!!
I fell confident that I can identify the different rates of chemicals.
It is challenging to explain the difference between the role of the physical surface area as well as the presence of a catalyst in the reaction.One example of reaction rates I encounter everyday is when I strike a matches every time.How are reaction rate is applied in daily life?This is known to be be a powerful diagnostic tool and it is called a reaction's rate. It is one that is seen when we can create methods to increase production by understanding how quickly items are made and what slows down reactions.
Therefore, reaction rate, in regards to chemistry, is seen as the speed with which a said or given chemical reaction moves or functions.
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If the theoretical yield of a reaction is 332.5 g and the percent yield for the reaction is 38 percent, what's the actual yield of product in grams?
A)
126.4 g
B)
8.74 g
C)
116.3 g
D)
12616 g
Which of these are chemical compounds?
02
CO 2
H ₂0
N 2
CO 2
H ₂0
what are chemical compounds?a material created by chemically combining two or more components in a certain ratio.any substance made up of similar molecules with atoms from two or more chemical elements is a chemical compound.To learn more about : chemical compounds
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