A term for using radioactive decay to determine the age of once-living fossils is-------
Answer:
I believe the answer is carbon dating
Explanation:
3. During an experiment, 98 g of water is used in the Styrofoam cup. The initial temperature
of water was 23.7°C. A 39.9-g piece of metal with initial temperature of 100.3°C (after
removing from the boiling water) is added to the calorimeter. The final temperature of water
was 28.2°C.
Calculate the specific heat of the metal.
Identify the metal.
Calculate the percent of error.
Answer:
Explanation:
To solve this problem, we can use the equation:
q = mcΔT
where q is the heat absorbed or released, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature.
First, we can calculate the heat absorbed by the water:
q_water = (98 g) (4.18 J/g°C) (28.2°C - 23.7°C) = 1938.4 J
Next, we can calculate the heat released by the metal:
q_metal = -q_water = -1938.4 J
The negative sign indicates that the metal released heat to the water.
We can rearrange the equation to solve for the specific heat of the metal:
c = -q_metal / (mΔT)
c = -(-1938.4 J) / (39.9 g) (100.3°C - 28.2°C)
c = 0.387 J/g°C
Therefore, the specific heat of the metal is 0.387 J/g°C.
To identify the metal, we can compare its specific heat to known values for different metals. From the specific heat values of common metals, we can see that the metal is most likely aluminum (specific heat of 0.902 J/g°C), as it has a much lower specific heat than copper, iron, or lead.
To calculate the percent error, we can use the formula:
percent error = (|experimental value - accepted value| / accepted value) x 100%
The accepted specific heat of aluminum is 0.902 J/g°C.
percent error = (|0.387 J/g°C - 0.902 J/g°C| / 0.902 J/g°C) x 100%
percent error = 57.1%
Therefore, the percent error is 57.1%.
10.Henry is picking up a load identified as UN1449. According to Schedule 1, what is its subsidiary class?
UN1449 is a UN number that is used to identify a specific hazardous material or substance during transportation. To determine the subsidiary class of UN1449, we need to consult the relevant Schedule 1 of the UN Model Regulations or the applicable national regulations.
What are the properties and characteristics of hazardous materials?The subsidiary class of a hazardous material is determined by its properties and characteristics, such as its physical state, chemical composition, toxicity, flammability, and reactivity. These properties help to identify the potential risks and hazards associated with the material and inform the appropriate measures for safe handling, storage, and transport.
In general, the subsidiary class of a hazardous material is indicated by a numerical code following the primary class, such as Class 3, Flammable Liquids, Packing Group II (UN1263). However, the exact classification and labeling requirements for hazardous materials depend on various factors, including the mode of transport, quantity, packaging, and destination.
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Label the parts of the atom shown below?
A
B
C
The parts of the atom is as follows:
A.) Electrons
ElectronsB.) Neurons
ElectronsB.) NeuronsC.) Protons
What is an atom?An atom is defined as the indivisible part of an element that cannot further be broken down into smaller particles through a chemical process.
The various parts of an atom include the following:
Electrons: This is the outermost part of an atom of an element that are usually negatively charged.Neutrons: This is found in the inner nucleus of an atom and they do not bear an charges.Protons: They are also located at the nucleus of the atom and they are positively charged.Learn more about elements here:
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Answer:
A. electron
B. neutron
C. proton
Explanation:
Lightning struck a tree, causing it to break and crash to the ground. The tree broke off 12 feet above the ground and the broken part was 20 feet long. The broken tree formed a right triangle. Determine how far the tip of the tree is from the base of the tree.
Distance =_______ ft.
Distance 11.143 ft or thereabouts is Distance roughly how far the tree extends from its tip to its base.
How Far Is It?Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting and ending position.
We obtain a quadratic equation by simplifying and expanding the left side:
2y^2 - 288y + 144 = 0
The quadratic formula is used to solve for y, and the result is: y = [288 (2882 - 4(2)(144)]
/(2(2))
y = [288 ± √58368]
y = 0.857 ft or /4 y = 84 foot
The only viable answer is: y 0.857 ft since y cannot be higher than 12 ft (the whole height of the tree).
The result of changing this number for y in the equation x + y = 12 ft is: x + 0.857 ft = 12 ft x 11.143 ft
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CH3CHO was treated with a reagent X. The product formed upon hydrolysis in the presence of an acid gave propan-2-ol. The reagent X is :
( a ) Aqueous KOH
( b ) Alcoholic KOH
( c ) CH3MgI ( Grignard Reagent )
( d ) Alcoholic KCN
It should be noted that the right response is (b) Alcoholic KOH, which upon hydrolysis would produce the secondary alcohol propan-2-ol.
How to explain the reagentThe reagent X should be able to add a nucleophile to the carbonyl carbon of CH3CHO, and the product formed should be capable of being hydrolyzed to give propan-2-ol.
Option (c) CH3MgI (Grignard reagent) is a strong nucleophile and can add to the carbonyl carbon of CH3CHO to form a tertiary alcohol. However, the product formed will be propan-2-ol (2-methylpropan-1-ol) instead of propan-2-ol (propanol). Therefore, option (c) can be eliminated.
Option (d) Alcoholic KCN is a nucleophilic reagent that can add to the carbonyl carbon of CH3CHO to form an intermediate that can be hydrolyzed to give a carboxylic acid. Therefore, option (d) can be eliminated.
However, since the reaction conditions are not specified, it is not possible to determine which of the two options is the correct answer. If the reaction is carried out under basic conditions, then option (a) would be the correct answer. If the reaction is carried out under acidic conditions, then option (b) would be the correct answer.
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A metal has a specific heat of 0.424 J/gC. You have 85 g of the metal at an initial temperature of 25 C. You added 650 J of heat to the metal. What is the final temperature of the metal?
The maximum temperature of metal is 1,381,250 J/gC.
How can one measure temperature?The heat capacity is defined as the heat-to-temperature change ratio, or C.C=qΔTmC=(650J)(25∘C)(85)=1,381,250J∘/gCCan a substance withstand how much heat?The proportion of heat absorption to temperature change in a substance. Calories per degree are commonly used to express the amount of material being taken into account, which is frequently a mole (the molecular weight in grams). The heat capacity in calories per gram is referred to as specific heat.The heat capacity, also known as the thermal capacity, is the amount of heat necessary to induce a specific mass of material to change its temperature by a unit.For more information on heat capacity kindly visit to
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In an isosceles right triangle, the length of the hypotenuse is 6 units. Which measurement is NOT associated with the triangle?
a. 45° degrees
b. 90° degrees
c. 6√2
d. 3√2
(30 points)
Answer:
Therefore, the answer is none of the above; all options are associated with the triangle.
Explanation:
In an isosceles right triangle, the two legs are congruent, and each angle other than the right angle is 45 degrees. Since the hypotenuse of the triangle is 6 units, each leg has a length of:
leg length = hypotenuse / √2 = 6 / √2
This can be simplified by multiplying the numerator and denominator by √2:
leg length = (6 / √2) * (√2 / √2) = 6√2 / 2 = 3√2
Therefore, the length of each leg is 3√2 units.
Option (c) 6√2 is associated with the triangle as it is the length of the hypotenuse.
Option (a) 45° degrees is associated with the triangle as it is one of the acute angles of the isosceles right triangle.
Option (b) 90° degrees is associated with the triangle as it is the right angle of the isosceles right triangle.
Option (d) 3√2 is associated with the triangle as it is the length of each leg of the isosceles right triangle.
Therefore, the answer is none of the above; all options are associated with the triangle.
What mass of glucose can be produced from a photosynthesis reaction
6 CO2(g) + 6 H2O(l) →
C6H12O6(aq) + 6 O2(g)
that occurs using 11.5 mol CO2?
Answer in units of g.
345.53 g of glucose can be produced from the given reaction, using 11.5 mol of CO2.
What is Photosynthesis Reaction?
Photosynthesis is a process by which plants, algae, and some bacteria convert carbon dioxide (CO2) and water (H2O) into organic compounds, such as glucose, using sunlight as the source of energy.
6 CO2 + 6 H2O + energy (sunlight) → C6H12O6 (glucose) + 6 O2
From the balanced equation, we know that 6 moles of carbon dioxide react to form 1 mole of glucose. Therefore, we can calculate the moles of glucose produced from 11.5 moles of CO2:
moles of glucose = 11.5 mol CO2 / 6 mol CO2 per mole of glucose = 1.9167 mol glucose
Next, we can use the molar mass of glucose to calculate the mass of glucose produced:
mass of glucose = moles of glucose x molar mass of glucose
mass of glucose = 1.9167 mol x 180.156 g/mol
mass of glucose = 345.53 g
Therefore, 345.53 g of glucose can be produced from the given reaction, using 11.5 mol of CO2.
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Predict the missing component in the nuclear equation.
Answer:
B
Explanation:
this equation shows an alpha decay
12.For UN3090 LITHIUM METAL BATTERIES (including lithium alloy batteries), which special provision tells you what safety mark should be used?
The lithium metal batteries are used in many devices like cell phones, tablets and laptops. The special provision 149 tells you what safety mark should be used.
What is Lithium metal batteries?The primary batteries which have metallic lithium as an anode are called lithium metal batteries. Most of the lithium metal batteries are found to be non-rechargeable. There are three types of cells which are used in lithium batteries, they are cylindrical, prismatic and pouch cells.
The special provision 149 of the TDG regulations states that UN3090, LITHIUM METAL BATTERIES and UN3480 LITHIUM ION BATTERIES are forbidden for transport as cargo on a passenger aircraft.
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Calculate the number of CO2
molecules ( NCO2
) in 0.0734 mol
of CO2
Answer:
4.42 x 10^22 molecules
Explanation:
1 mole of CO2 has 6.022 x 10^23 molecules
=> 0.0734 x 6.022 x 10^23 = 4.420148 x 10^22 or 4.42 x 10^22
93.2 mL of a 2.03 M potassium fluoride (KF) solution is diluted to a total volume of 4.01 L what will be the molarity of the diluted solution
The molarity of the diluted solution is 0.047 M. Molarity is commonly used in chemistry to quantify the concentration of a solute in a solution and to calculate the amount of reactants required for a chemical reaction.
What is Molarity?
Molarity is a unit of concentration that measures the number of moles of a solute dissolved in one liter of a solution. It is expressed in units of moles per liter (mol/L or M). For example, a solution with a molarity of 0.5 M contains 0.5 moles of solute per liter of solution.
To find the molarity of the diluted solution, we can use the equation:
M1V1 = M2V2
Where:
M1 = initial molarity of the solution
V1 = initial volume of the solution
M2 = final molarity of the solution
V2 = final volume of the solution
We can rearrange the equation to solve for M2:
M2 = (M1V1) / V2
Plugging in the given values, we get:
M2 = (2.03 M x 93.2 mL) / 4.01 L
M2 = 0.047 M
Therefore, the molarity of the diluted solution is 0.047 M.
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Answer:
0.047
Explanation:
acellus
I need help with work
The limiting reactant is completely used up in the reaction. There will be an excess of other reactants at the end of the reaction. The limiting reactant dictates the amount of product.
What is limiting reactant?Reactant will be the limiting reactant depends on the molar ratios of all the reactants in the experiment (and the coefficients in the balanced reaction equation), so it will absolutely vary depending on the reaction setup and conditions, which is why it cannot always be the same for a given reaction.
Because the molar ratios of the reactants dictate which of them will be the limiting one, it is not true that the one with the lowest mass will always be the limiting reactant.
Therefore, The limiting reactant is completely used up in the reaction. There will be an excess of other reactants at the end of the reaction.
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Find the molar mass of BeCo3
Answer:
To find the molar mass of BeCo3, we need to find the atomic masses of each element and add them together in the correct ratio:
Be: 9.01 g/mol
Co: 58.93 g/mol
O: 16.00 g/mol (there are three oxygen atoms)
Molar mass of BeCo3 = (1 x Be atomic mass) + (1 x Co atomic mass) + (3 x O atomic mass)
Molar mass of BeCo3 = (1 x 9.01 g/mol) + (1 x 58.93 g/mol) + (3 x 16.00 g/mol)
Molar mass of BeCo3 = 9.01 g/mol + 58.93 g/mol + 48.00 g/mol
Molar mass of BeCo3 = 115.94 g/mol
Therefore, the molar mass of BeCo3 is 115.94 g/mol.
Phosphorus pentachloride decomposes according to the chemical equation
PCl5(g)↽−−⇀PCl3(g)+Cl2(g)c=1.80 at 250 ∘C
A 0.2377 mol
sample of PCl5(g)
is injected into an empty 3.45 L
reaction vessel held at 250 ∘C.
Calculate the concentrations of PCl5(g)
and PCl3(g)
at equilibrium.
[PCl5]=?
[PCl3]=?
The concentrations of PCl5(g) and PCl3(g) at equilibrium are 0.0524 M and 0.0165 M, respectively.
StepsFor the given reaction, the equilibrium constant (Kc) is 1.80 at 250 °C.
The concentration of PCl5(g) is 0.2377 mol/3.45 L = 0.0689 M at the beginning of the process.
Let x M be the PCl3(g) concentration at equilibrium. Hence, x M is likewise the concentration of Cl2(g) at equilibrium.
Using the equilibrium constant expression:
Kc = [PCl3][Cl2]/[PCl5]
1.80 = x * x / (0.0689 - x)
Solving for x using the quadratic formula:
x = [(-1) ± sqrt(1 + 4 * 1.80 * 0.0689)] / (2 * 1)
x = 0.0165 M or 0.0524 M
Therefore, at equilibrium:
[PCl5] = 0.0689 - x = 0.0524 M
[PCl3] = x = 0.0165 M
So, the concentrations of PCl5(g) and PCl3(g) at equilibrium are 0.0524 M and 0.0165 M, respectively.
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Compare myths and folklore, specifically the types of content they cover and how they are shared in a society. Which do you believe is culturally meaningful?
What I have so far.
myth is a story that is usually about a sacred person, while folklore is a group of fictional tales about people or animals. Superstitions and unfounded beliefs are key elements in the folklore tradition.
Really need help with the second part.
specifically the types of content they cover and how they are shared in a society. Which do you believe is culturally meaningful?
Folklore is a compilation of made-up stories about people or animals, as opposed to myth, which has as its central theme the origins of a people and is frequently sacred. Important components of the folklore practice include superstitions and unfounded notions.
What cultural connections do myths and folklore have?
A society's myths and folklore are frequently the foundation upon which its culture is constructed. The origins of most cultural practices and beliefs can be found in the myths of a community. The moral limits and fundamental rules for how members of a community should live are established by myths and legends.
Folktales are regarded as tales that have been handed down to current generations from the ancestors of a specific group of people. These typically offer a lesson. On the other hand, a myth is a traditional tale from early history or one that explains a natural occurrence, often involving supernatural entities.
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While experimenting with acid-base reactions, a student mixes lithium hydroxide (LiOH) and hydrofluoric acid (HF) together. The products of the reaction are
and
.
Answer:
hyrdrifluoric acid
Explanation:
How many grams of NaOH reacted
When 28g of Fe(OH)₃ are made in this reaction then 31.4g of NaOH forms.
What is Mole concept?
The mole concept is a convenient method of expressing the amount of a substance.
Avogadro's number is the number of units in one mole of any substance and equals to 6 .02214076 × 1023. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Given,
Mass of Fe(OH)₃ = 28g
We know that Molecular mass of NaOH = 40g
Molecular mass of Fe(OH)₃ = 106.8g
According to the equation given in question,
3 moles of NaOH forms 1 mol of Fe(OH)₃
Hence, 40×3 = 120g of NaOH forms 106.8g Fe(OH)₃
1g Fe(OH)₃ will formed by = 120÷106.8 g NaOH = 1.12g
28g of Fe(OH)₃ will formed by = 1.12×28 = 31.4g NaOH
Therefore, When 28g of Fe(OH)₃ are made in this reaction then 31.4g of NaOH forms.
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How much energy is stored in a spring that is compressed 0.850m if the spring constant is
500.N/m?
181J
425J
212J
361J
The energy is stored in a spring that is compressed 0.850m is 213.125 J
Energy stored in springPotential energy is the name for this accumulated energy. The accumulated potential energy as a result of a specific elastic object, such as a spring, deforming is known as the potential energy of the spring. It describes the labor involved in stretching the spring and is dependent on both the length of the stretch and the spring constant, k.
Given Data
Distance = 0.850mSpring constant = 500.N/mWe know that the expression for energy stored is given as
Energy = Ke
Substituting our given data we have
Energy = 0.5 x 500 N/m x (0.850m)2
= 0.5 x 500 N/m x (0.850m x 0.850m)
= 0.5 x 500 N/m x 0.7225m2
= 213.125 J
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Salt crystals, such as KCI hold together well. Which of the following provides a strong attraction to the potassium lon? A) Chlorine anlon B Chlorine cations Potasslum anlons D) Potassium cations
The Chlorine anlon provides a strong attraction to the potassium ion. That is option A.
What is an anion and a cation?An anion is defined as the negatively-charged ions which means that they have more electrons than protons due to having gained one or more electrons.
A cation is defined as the positively-charged ions which means that atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons.
The potassium is a cation while the chlorine atom is an anion in the crystal salts.
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Sodium hydroxide, NaOHNaOH, is a strong base that is used in industrial synthesis and processes such as making paper.
What is the mass of 2.20 x1022 formula units of NaOHNaOH (Molar mass = 40.0 g/molg/mol)?
Express the mass in grams to three significant figures.
Answer:
the mass of 2.20 x 10^22 formula units of NaOH is 1.46 grams to three significant figures.
Explanation:
To calculate the mass of 2.20 x 10^22 formula units of NaOH, we can use the following steps:
Calculate the number of moles of NaOH:
Number of moles = Number of formula units / Avogadro's number
Number of moles = 2.20 x 10^22 / 6.022 x 10^23
Number of moles = 0.0365 mol
Calculate the mass of NaOH:
Mass = Number of moles x Molar mass
Mass = 0.0365 mol x 40.0 g/mol
Mass = 1.46 g
Therefore, the mass of 2.20 x 10^22 formula units of NaOH is 1.46 grams to three significant figures.
Upgrading the usually speeds up the computer, while adding a(n) will increase the system’s storage capacity. Additional can improve the sound or video quality.
The statement is incomplete, but I assume the missing word is "graphics card" or "GPU" and upgrading the usually speeds up the computer.
Why adding a Graphics card can improve sound or video quality?
Adding a dedicated graphics card can indeed improve the sound or video quality by offloading the processing of graphics-intensive tasks from the CPU to the GPU. This can result in smoother video playback, faster rendering of 3D graphics, and improved overall system performance.
It's also worth noting that upgrading other components, such as the RAM or CPU, can also improve system performance, not just the speed of the computer. Adding more RAM can help with multitasking and running memory-intensive applications, while upgrading the CPU can improve overall processing power and speed.
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what id the Charge of element "X" in X3(PO4)2
Answer:
+2.
Explanation:
Each phosphate ion (PO43-) has a charge of -3. Since there are two phosphate ions in the formula, the total negative charge from the phosphate ions is -6.
In order to balance the negative charge, the sum of the positive charges from the X3+ ions must be +6.
the charge of element X can be calculated as follows:
X3+ × 3 = +6
X3+ = +2
So the charge of element X in X3(PO4)2 is +2.
The law of conservation of nucleon number says that the total number of _______ before and after the reaction.
A. neutrons
B. electrons
C. protons
D. nucleons
Answer:
The correct answer is D. nucleons.
The law of conservation of nucleon number, also known as the law of conservation of mass number, states that the total number of nucleons (protons and neutrons) in a closed system remains constant before and after a nuclear reaction. This means that the sum of the mass numbers of the reactants must be equal to the sum of the mass numbers of the products. Therefore, the total number of nucleons is conserved in a nuclear reaction.
So, the law of conservation of nucleon number says that the total number of nucleons (protons and neutrons) is conserved before and after the reaction.
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The mass of H2 produced is 0.657 g.
What is a chemical reaction?Generally, The balanced equation is:
2 HCl → H2 + Cl2
The molar mass of HCl is 36.5 g/mol (1+35.5).
First, we need to determine the number of moles of HCl:
23.8 g HCl × (1 mol HCl/36.5 g HCl) = 0.651 mol HCl
From the balanced equation, we can see that 2 moles of HCl produce 1 mole of H2:
2 mol HCl → 1 mol H2
So, we can calculate the number of moles of H2 produced:
0.651 mol HCl × (1 mol H2/2 mol HCl) = 0.326 mol H2
Finally, we can use the molar mass of H2 to convert the number of moles of H2 to grams:
0.326 mol H2 × 2.016 g H2/mol = 0.657 g H2
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1. What is the volume of a solution that has a density of 0.75 g/mL and a mass of 164 g?
The density of a substance is defined as its mass per unit volume. Therefore, we can use the formula:
density = mass / volume
to find the volume of the solution.
Rearranging this formula, we get:
volume = mass / density
Substituting the given values, we get:
volume = 164 g / 0.75 g/mL
volume = 218.67 mL
Therefore, the volume of the solution is 218.67 mL
Answer:the mass of the sample is 90 grams.
Explanation:
Existen los super-genes.
Group of linked genes acting as an allelic unit due to the suppression of crossing-over is called supergene.
What is meant by a supergene?Chromosomal region encompassing multiple neighboring genes that are inherited together because of close genetic linkage is called supergene.
The best examples of supergenes are the morphologically and genetically distinct sex chromosomes which has evolved independently in many groups of animals and plants. Sex chromosomes evolve from autosomes via mutation that causes its bearers to develop into a male or female.
Supergenes arise following the establishment of mutations at minimum of two sites, followed by sequential accumulation of additional mutations.
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Question: What is the meaning of supergene?
Injuries can also provide a blank of the suspect
Moreover, injuries may offer a hint or description of the culprit. The type and location of the injury may give away information about the suspect's physical attributes, such as height, weight, or age.
What do the injuries provide?Injuries can also reveal the suspect's method of operation, including whether they are right- or left-handed or if they used a certain kind of tool or weapon. To learn as much as they can about the crime and the parties involved, it is crucial for detectives to thoroughly examine any wounds that victims or suspects may have left behind.In forensic science, injuries can play a significant role in establishing the cause and manner of death or in locating the criminal. Investigators may be able to better understand the circumstances around a crime and recreate what actually happened with the help of the location and type of injury. Furthermore, the existence or absence of injuries can be used to support or refute witness accounts and other pieces of evidence.learn more about forensic science here
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5.0 mol Al reacts with 6.0 mol O2 to form Al2O3.
How many moles of Al2O3 form when all 5.0 moles of Al are used up?
Answer:
2.5 moles of aluminum oxide will form when all 5.0 moles of aluminum are used up.
Explanation:
The balanced chemical equation for the reaction between aluminum (Al) and oxygen (O2) to form aluminum oxide (Al2O3) is:
4 Al + 3 O2 → 2 Al2O3
This equation shows that 4 moles of aluminum react with 3 moles of oxygen to form 2 moles of aluminum oxide.
According to the problem, we have 5.0 mol of aluminum, which is more than enough to react with the oxygen available, and the limiting reagent in this reaction will be aluminum. Therefore, we need to use the mole ratio from the balanced equation to find out how many moles of aluminum oxide will form when all 5.0 moles of aluminum are used up.
From the equation, we can see that for every 4 moles of aluminum, 2 moles of aluminum oxide will form. Therefore, the mole ratio of aluminum to aluminum oxide is 4:2, or simplified, 2:1.
Using this mole ratio, we can calculate the number of moles of aluminum oxide that will form when all 5.0 moles of aluminum react:
5.0 mol Al × (2 mol Al2O3/4 mol Al) = 2.5 mol Al2O3
Therefore, 2.5 moles of aluminum oxide will form when all 5.0 moles of aluminum are used up.