Peter measured the height of a plant five times then the measurements is the least precise is 15.5 cm
Measurement precision is the numerically using measure of imprecision as that standard deviation then calculated from the result by carrying replicate measurement and here given measurements are 15.5 cm, 19.4 cm, 15.6 cm, 15.8 cm, 15.9 cm and in that measurements the least precise are 15.5 cm
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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
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
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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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.
i need help with chemistry equation
The maximum amount of sulfur dioxide (SO₂) that can be formed is 25.6 g.
The formula for the the limiting reagent is CO
The amount of excess reagent that remains after the reaction is 3.6 g.
What is limiting reagent?The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
The limiting reagent is determined by balancing the chemical equation as follows;
S + 2CO --------> SO₂ + 2C
From the reaction above;
1 mole of sulfur = 2 mole of carbon monoxide = 1 mole of sulfur dioxide
56 g of carbon monoxide (CO) = 64 g of sulfur dioxide (SO₂ )
22.4 g of CO = ? of SO₂
= (22.4 x 64)/56
= 25.6 g of SO₂
Thus, the maximum amount of sulfur dioxide (SO₂) that can be formed is 25.6 g.
The formula for the the limiting reagent is CO because it will be completely used up.
56 g of CO = 32
22.4 of CO = ?
= (22.4 x 32)/56
= 12.8 g
Excess mass of the sulfur that remains = 16.4 g - 12.8 g = 3.6 g
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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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Calculate the theoretical yield in grams AlI₃ from the complete reaction of 113 grams I₂ according to the following balanced chemical equation: 2 Al(s) + 3 I₂(s) → 2 AlI₃(s)
The theoretical yield of All3 obtain from the reaction is 121g.
2Al + 3I₂ —> 2AlI₃
Molar mass of I₂ = 2 × 127 = 254 g/mol
Molar mass of I₂ from the equilibrium equation = 3 × 254 = 762 g
Molar mass of AlI₃ = 27 + (3 × 127) = 408 g/mol
Mass of AlI3 from the equilibrium equation = 2 × 408 = 816 g
762 g I₂
From the balanced formula above,
762 g I 2 is The reaction produced by 816 g of All3.
From the balanced equation above,
gives 762 g of I2, which reacts to form 816 g of AlI3 121g.
Convert grams to moles using molar ratios to crosslink products and reactants and convert moles back to grams. Calculated on a stoichiometric basis. Actual yield is determined experimentally. The yield rate is determined by calculating the ratio of actual yield/theoretical yield.
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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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What's the molality of a solution with 120 g of NaCl and 30 kg of water?A)0.068B)0.004C)0.25D)6.8
Explanation:
Molality is the ratio of the amount of substance of a solute (in moles – n) to the mass in kilograms of the solvent (m).
The symbol for molality is usually W and it can be calculated by the following formula:
W = n/m
here, we need to calculate n of NaCl using the formula:
n = m/MM
where MM of NaCl is 58.5 g/mol
n = 120/58.5
n = 2.05 moles
W = 2.05/30
W = 0.068 mol/Kg
Answer: A) 0.068
An unknown element Y with atomic number 14 is found in nature as a mixture of three isotopes. Isotope 28 has a percentage of 92.2% and isotope 29 which has a percentage of 4.7%. The third isotope is isotope 30 a- What is the percentage of its presence in nature? b- What is the expected chemical symbol for the previous isotope?
a) The percentage of presence in nature of 1st 2nd and 3rd isotopes is 92.2% 4.7 % and 3.1 %.
b) The chemical symbol for isotopes is ²⁸Si , ²⁹Si , ³⁰Si.
Element with atomic number 14 silicon . chemical symbol is Si.. Four isotopes of silicon's occur in natural environment- ²⁸Si , ²⁹Si , ³⁰Si ³²Si. The ²⁸Si , ²⁹Si , ³⁰Si is stable isotopes. And the fourth one ³²Si is radiogenic. Silicon atom have mass of 28 amu. ²⁸Si is the most abundant isotope of silicon has percentage of 92.2% . ²⁹Si is 4.7 % and the third is ³⁰Si is 3.1 %.
Thus, An unknown element Y with atomic number 14 is found in nature as a mixture of three isotopes. isotopes 28 has percentage of 92.2 % and isotopes 29 which has percentage of 4.7 %.the third isotopes is 30.
a) The percentage of presence in nature of 1st 2nd and 3rd isotopes is 92.2% 4.7 % and 3.1 %.
b) The chemical symbol for isotopes is ²⁸Si , ²⁹Si , ³⁰Si.
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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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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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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
What is the mass in grams of 23.4 moles of NaCl?
Answer:
1368.9 [gr].
Explanation:
1. the formula of the required mass is:
m=Mν, where M=[gr/mol] and ν=[moles];
2. M=M(NaCl)=M(Na)+M(Cl)=23+35.5=58.5 [gr/mol];
ν=23.4 [moles] according to the condition, then
3. the required mass:
m=23.4*58.5=1368.9 [gr].
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:
help please, and put explanation if possible!! :)
Answer:
Explanation:
Here's a quick review of the types of reactions.
Synthesis:
Two or more chemicals combine to make a new one.
Ie: A+B => AB or A+B => C
Decomposition:
The opposite of synthesis.
Ie: AB => A+B, C => A+B
Combustion:
Usually something reacting with oxygen. That something usually being a carbohydrate.
Ie: CH4 + 2O2 => CO2 + 2H2O
Single replacement:
One atom or molecule of a compound is knocked out of place and replaced by another chemical
Ie: A+BC => AB + C (note how the bond between B and C break while a bond between A and B form)
Double replacement:
A little like a single replacement, but two bonds break and two new bonds form between two reactants.
Ie: AB+CD => AC+BD
The actual answer
The first equation (2C3H7OH + 9O2....)
Is a combustion reaction because it contains oxygen and the oxygen is oxidizing something.
The second equation (2Al + 3 ZnCl2...)
Is a single replacement reaction because only one type of bond is being broken (the Zn---Cl bond) and only another one type of bond is formed (The Al---Cl bond)
The third equation (NaCl + AgNO3...)
Is a double replacement reaction because two types of bonds are being broken (Na---Cl and Ag---NO3) and two new bonds are forming (Ag---Cl and Na---NO3)
The fourth equation (N2H8CO3...)
Is a decomposition reaction because there is only one reactant and it is splitting into multiple pieces
The fifth equation (2Al + 3Br2...)
Is a synthesis reaction because two elements/ compounds are being combined to make a singular new compound
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.
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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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.
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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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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How many copper atoms are in 5.33mol CuCl2
The number of copper atoms are in 5.33mol CuCl2 =5.33 × 6.023 × 1023 = 3.21 × 1024
Copper AtomsThe chemical element copper has the atomic number 29 and the symbol Cu. It is an extremely high thermal and electrical conductivity metal that is soft, malleable, and ductile. Pure copper has a pinkish-orange tint when it is first exposed to the air. They all have 29 protons in their nuclei. However, they also contain neutrons, which are neutral particles. There are two different types of atoms in natural copper. One's nucleus contains 29 protons and 34 neutrons, whereas the other's contains 29 protons and 36 neutrons.Copper-63 (69.15 percent) and copper-65 (6.5 percent) are the two stable isotopes that make up natural copper (30.85 percent).
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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
how would you prepare the following aqueous solution. 365ml of 8.55*10^-2 M kh2po4 from solid kh2po4.
Answer:
Explanation:
6.78 kg
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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I'm stuck and in need of help.
if you put 10 ml mercury 20 ml water and 30 ml kerosene in a container what will it look like
The substances would look as follows;
Kerosene at the topWater at the middleMercury at the lowest layerHow would it look like?Let us recall that just like solids, the density of the solids is important in the determination of how the mixture of the substances would appear. The substances that are denser would tend to appear below while the substances that are less dense would tend to appear above.
Let us remind ourselves the densities of each of the substances as a hep to where we are going;
Water - 1 g/cm³
Mercury - 5.43 g/cm³
Kerosene - 0.82 g/cm³
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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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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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4Fe(s) + 302(g) → 2Fe2O3(g)
In a certain reaction, 42.9 g of iron is reacted with 27.5 g of oxygen.
How many grams of iron(III) oxide are produced in the reaction?
Taking into account the reaction stoichiometry, if 42.9 g of iron is reacted with 27.5 g of oxygen, 61.335 grams of iron(III) oxide are produced.
Reaction stoichiometryIn first place, the balanced reaction is:
4 Fe + 3 O₂ → 2 Fe₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Fe: 4 moles O₂: 3 molesFe₂O₃: 2 molesThe molar mass of the compounds is:
Fe: 55.85 g/moleO₂: 32 g/moleFe₂O₃: 159.7 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe: 4 moles ×55.85 g/mole= 223.4 gramsO₂: 3 moles ×32 g/mole= 96 gramsFe₂O₃: 2 moles ×159.7 g/mole= 319.4 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 96 grams of O₂ reacts with 223.4 grams of Fe, 27.5 grams of O₂ reacts with how much mass of Fe?
mass of Fe= (27.5 grams of O₂× 223.4 grams of Fe)÷ 96 grams of O₂
mass of Fe= 63.995 grams
But 63.995 grams of Fe are not available, 42.9 grams are available. Since you have less mass than you need to react with 27.5 grams of O₂, Fe will be the limiting reagent.
Mass of Fe₂O₃ formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 223.4 grams of Fe form 319.4 grams of Fe₂O₃, 42.9 grams of Fe form how much mass of Fe₂O₃?
mass of Fe₂O₃= (42.9 grams of Fe×319.4 grams of Fe₂O₃)÷ 223.4 grams of Fe
mass of Fe₂O₃= 61.335 grams
Then, 61.335 grams of Fe₂O₃ are produced.
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