Answer :
(a) The mass of [tex]Al_2O_3[/tex] produced is, 15.2 grams.
(b) The percent yield of the reaction is, 72.5 %
Explanation :
Part (a) :
Given,
Mass of [tex]Al[/tex] = 85.1 g
Molar mass of [tex]Al[/tex] = 27 g/mol
First we have to calculate the moles of [tex]Al[/tex]
[tex]\text{Moles of }Al=\frac{\text{Given mass }Al}{\text{Molar mass }Al}=\frac{85.1g}{27g/mol}=3.15mol[/tex]
Now we have to calculate the moles of [tex]Al_2O_3[/tex]
The balanced chemical equation is:
[tex]4Al+3O_2\rightarrow 2Al_2O_3[/tex]
From the reaction, we conclude that
As, 4 moles of [tex]Al[/tex] react to give 2 moles of [tex]Al_2O_3[/tex]
So, 3.15 moles of [tex]Al[/tex] react to give [tex]\frac{2}{4}\times 3.15=1.58[/tex] mole of [tex]Al_2O_3[/tex]
Now we have to calculate the mass of [tex]Al_2O_3[/tex]
[tex]\text{ Mass of }Al_2O_3=\text{ Moles of }Al_2O_3\times \text{ Molar mass of }Al_2O_3[/tex]
Molar mass of [tex]Al_2O_3[/tex] = 102 g/mole
[tex]\text{ Mass of }Al_2O_3=(1.58moles)\times (102g/mole)=161.2g[/tex]
Therefore, the mass of [tex]Al_2O_3[/tex] produced is, 161.2 grams.
Part (b) :
Now we have to calculate the percent yield of the reaction.
[tex]\text{Percent yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100[/tex]
Experimental yield = 116.9 g
Theoretical yield = 161.2 g
Now put all the given values in this formula, we get:
[tex]\text{Percent yield}=\frac{116.9g}{161.2g}\times 100=72.5\%[/tex]
Therefore, the percent yield of the reaction is, 72.5 %
A frisbee is moving at 11 m/s and has 3.6j of energy. how much does it weigh?
Answer:
0.06 kg
Explanation:
Given data:
Mass of frisbee = ?
Velocity of frisbee = 11 m/s
Energy of frisbee = 3.6 j
Solution:
K.E = 1/2 mv²
Now we will put the values in this formula.
3.6 J = 1/2 m(11m/s)²
3.6 j = 0.5 ×121m²/s² × m
3.6 j = 60.5 m²/s² × m
m = 3.6 j/60.5 m²/s²
m= 0.06 j.m⁻².s²
j = Kg.m².s⁻²
m= 0.06 Kg.m².s⁻² .m⁻².s²
m = 0.06 kg
Which statement is true about a polyatomic ion?
It forms metallic bonds with other ions.
It forms covalent bonds with other ions.
It is made of atoms that are covalently bonded together.
It has a charge that is distributed over part of the entire unit.
*
Answer:
It is made of atoms that are covalently bonded together.
Explanation:
For example the carbonate ion CO3++.
The carbon and oxygen atoms are held together by covalent bonds.
Answer:
"It is made of atoms that are covalently bonded together." (C)
Explanation:
Polyatomic ion is made of three atoms that are covalently bonded together
Edg. 2020 :)
what volume of oxygen gas is equal to 4.5 miles at STP
Answer:
i believe this is the answer The most common example is the molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.
Explanation:
When a chemical reaction occurs, _____.
a phase change takes place
the physical and chemical properties of the products are different from the reactants
the physical and chemical properties of the reactants are the same as the properties of the products
the compounds can be separated by physical means
Answer: When a chemical reaction occurs, _____.
a phase change takes place
the physical and chemical properties of the products are different from the reactants
Explanation:
A chemical change is like dynamite exploding or iron rusting. It's an actual change in the chemical makeup resulting in a new product
A chemical reaction results in the production of new substances with physical and chemical properties that are different from the reactants, unlike a physical change which does not alter the molecular structure of the substance.
Explanation:When a chemical reaction occurs, the physical and chemical properties of the products are different from the reactants. A chemical reaction involves a change in the composition of the substances in question where bonds between atoms are broken and/or formed, resulting in the production of new substances. These new products exhibit different physical and chemical properties such as melting point, color, taste, etc. This is in contrast to a physical change which only affects the appearance or form of a substance without altering its molecular structure. Chemical changes are often more difficult to reverse than physical changes. For example, combining hydrogen and oxygen to produce water is a chemical change because it results in the formation of a new substance with different properties than those of the individual reactants.
Consider the reaction below. 2 upper N subscript 2 upper O subscript 5 (g) double-headed arrow 4 upper N upper O subscript 2 (g) plus upper o subscript 2 (g).
Answer:
The concentrations of the products and reactants do not change.
Explanation:
The following information is missing:
If the reaction is at dynamic equilibrium at 500 K, which statement applies to the given chemical system?
The forward and reverse reactions no longer occur. The rates of the forward and reverse reactions are unequal. The concentrations of the products and reactants do not change. The forward reaction stops at 500 K.Dynamic equilibrium means that the rate of the forward and reverse reactions are equal and different from zero. Then, the concentrations of the products and reactants do not change.
Answer:
c
Explanation:
Describe the steps used to create Lewis dot structures to represent covalent bonds.
How many mL of 3.0M HCl are needed to make 300.0 mL of a 0.10M HCl?
a
0.001 mL
b
none of the above
c
10 mL
d
0.10 mL
Answer:
V₁ = 10 mL
Explanation:
Given data:
Initial volume of HCl = ?
Initial molarity = 3.0 M
Final molarity = 0.10 M
Final volume = 300.0 mL
Solution:
Formula:
M₁V₁ = M₂V₂
M₁ = Initial molarity
V₁ = Initial volume of HCl
M₂ =Final molarity
V₂ = Final volume
Now we will put the values.
3.0 M ×V₁ = 0.10 M×300.0 mL
3.0 M ×V₁ = 30 M.mL
V₁ = 30 M.mL /3.0 M
V₁ = 10 mL
A container has 21.5L of helium gas at a pressure of 245 kPa and a temperature
of 315K. How many moles of helium are in the container?
Answer:
There are 2, 01 moles of helium in the container
Explanation:
We use the formula PV=nRT. We convert of pressure the unit kPa into atm:
101,325 kPa---1 atm
245 kPa ----x= (245 kPa x 1 atm)/101,325 kPa=2,42 atm
PV= nRT ---> n=PV/RT
n= 2, 42 atm x 21, 5 L/ 0,082 l atm /K mol x315K
n=2, 012620871 mol
What is the frequency of a wave traveling at 5,000 m/s with a wavelength of .002 m/cycle?
Answer:
[tex]2.5\cdot 10^6 Hz[/tex]
Explanation:
The relationship between the speed of a wave, its frequency and its wavelength is given by the wave equation:
[tex]v=f\lambda[/tex]
where
v is the wave speed
f is the frequency of the wave, which is the number of cycles completed by the wave in one oscillation
[tex]\lambda[/tex] is the wavelength, which is the distance between two consecutive crests of the wave
For the wave in this problem we have:
v = 5000 m/s is the speed
[tex]\lambda=0.002 m[/tex] is the wavelength of the wave
Solving for f, we find the frequency:
[tex]f=\frac{v}{\lambda}=\frac{5000}{0.002}=2.5\cdot 10^6 Hz[/tex]
Please help I’m being timed In many thermodynamically favored reactions, the total bond energy of the products is lower than the total bond energy of the reactants. Therefore, thermodynamically favored reactions are often
A) exothermic
B) endothermic
C) conducted in warm conditions
D) conducted in cold conditions
A hangar is a _____.
A) storage area for planes
B) place of fame
C) place to hide jewels
D) a tool to hang clothes on
Answer:
a
Explanation:
a is the 100% correct answer
Please I really need help!!!!!!!
Which example is an exothermic reaction?
A. dissolving sugar in water
B. dissolving ammonium nitrate in water to cool the water
C. oxidation of iron
D. melting ice
An example of an exothermic reaction is : C. oxidation of iron. The Exothermic process involves the liberation of heat.
What is an exothermic reaction?An exothermic reaction is a chemical or physical reaction that gives heat. It takes out energy to its surroundings. The energy needed for the reaction to occur is less than the total energy released.
In the oxidation of iron, the heat is released while all the other processes are endothermic in which is heat is absorbed.
Thus, the correct option is C.
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If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the atomic mass of the atom?
Answer:
20.179
Explanation:
The answer is 20.179 because the element you are talking about is the element Neon, which has the atomic mass of 20.179.
Name four metals and non-metals, and state
one major use of each
Answer:
Metals
1) Sodium : It is used in the formation of table salt i. e. sodium chloride.
2) Copper : It is used in the wires of electricity due to better conduction.
3) Silver : It is used in wires and for making jewelry.
4) Aurum: It is used for making jewelry.
Non metals
1) Chlorine : It is used in the production of sodium chloride salt which is used in foods.
2) Flourine : It is used in making toothpaste.
3) Hydrogen : It is used in the formation of acids.
4) Oxygen : It is widely used in the production of steel and plastic.
Consider the three equations below. Superscript 14 subscript 7 upper N plus superscript 1 subscript 1 upper H right arrow superscript 15 subscript 8 upper O. Superscript 4 subscript 2 upper H e plus superscript 4 subscript 2 upper H e right arrow superscript 8 subscript 4 upper B e. Superscript 28 subscript 14 upper S i plus 7 superscript 4 subscript 2 upper H e right arrow superscript 56 subscript 28 upper N i. Which statement do these reactions best support?
Answer:
(D)Nuclear fusion plays an important role in making elements that are heavier than helium.Explanation:
The movement of water between the ground, the atmosphere, and bodies of water is called the
Final answer:
The hydrologic or water cycle is the term for the movement of water between the ground, atmosphere, and bodies of water. It occurs through processes like evaporation, transpiration, condensation, precipitation, surface runoff, and groundwater flow, primarily driven by solar energy and gravity.
Explanation:
The movement of water between the ground, the atmosphere, and bodies of water is called the hydrologic cycle or water cycle. This cycle describes the continuous movement of water as it is evaporated from surfaces like rivers, lakes, and oceans into the atmosphere, forms clouds, precipitates as rain or snow, and returns to the surface. The cycle is driven by solar energy and gravity, moving water through various states: liquid, solid (ice), and vapor.
Water reaches the atmosphere through evaporation, transpiration (from plants), and sublimation (ice to water vapor). It returns as precipitation and may flow over the land as surface runoff or infiltrate into the ground to become groundwater, which slowly moves and can discharge into other bodies of water or return to the ocean.
How many grams of CaF2 are present in 1.25 L of a 0.15 M solution of CaF2? How do I find the grams I am confused on that part?
Answer:
Mass = 14.64 g
Explanation:
Given data:
Volume of solution = 1.25 L
Molarity of Solution = 0.15 M
Mass of CaF₂ = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.
0.15 M = number of moles of solute / 1.25 L
number of moles of solute = 0.15 M × 1.25 L
number of moles of solute = 0.1875 mol/L × L
number of moles of solute = 0.1875 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.1875 mol ×78.07 g/mol
Mass = 14.64 g
The Mass of CaF₂ is 14.64 g. Molarity is the ratio of number of moles over the volume of solution.
Given:
Volume of solution = 1.25 L
Molarity of Solution = 0.15 M
To find:
Mass of CaF₂ = ?
What is Molarity?Molarity is used to describe the concentration of solution. It is given by number of moles divided by volume of solution in litres.
Molarity = number of moles of solute / L of solution
We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.
0.15 M = Number of moles of solute / 1.25 L
Number of moles of solute = 0.15 M * 1.25 L
Number of moles of solute = 0.1875 mol/L * L
Number of moles of solute = 0.1875 mol
Calculation of mass:
Mass = number of moles / molar mass
Mass = 0.1875 mol *78.07 g/mol
Mass = 14.64 g
Thus, the mass of CaF₂ is 14.64 grams.
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Which type of reaction occurs in the following equation?
2NO2(g) + 2OH"(aq) —— NO2(aq) + NO, (aq) +H2O(1)
a combination redox reaction
a displacement redox reaction
a synthetic redox reaction
a disproportionation redox reaction
Answer:
A disproportionation redox reaction
Explanation:
1. Assign an oxidation number to every atom in the equation
[tex]2\stackrel{\hbox{$\mathbf{+4}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O }}_{2} + 2\stackrel{\hbox{-2}}{\hbox{O}}\stackrel{\hbox{+1}}{\hbox{H}^{-}} \longrightarrow \, (\stackrel{\hbox{$\mathbf{+3}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O }}_{2})^{-} + (\stackrel{\hbox{$\mathbf{+5}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O}_{3}})^{-} +\stackrel{\hbox{+1}}{\hbox{H}}_{2}\stackrel{\hbox{-2}}{\hbox{O}}[/tex]
2. Identify the atoms that change their oxidation number
N in NO₂: +4 ⟶ +3 in NO₂⁻
N in NO₂: +4 ⟶ +5 in NO₃⁻
3. Identify the type of change
This is a disproportionation — a reaction in which one substance is simultaneously oxidized and reduced.
Answer:
D
Explanation:
a movable chamber has a volume of 18.5 L (at temperature of 18.5 C) assuming no gas escapes and the pressure remains constant what is the temperature when the chamber has a volume of 19.8 L
Answer:
[tex]39 ^\circ C[/tex]
Explanation:
Given,
V₁ = 18.5 L
T₁ = 18.5° C = 273 + 18.5 = 291.5 K
V₂ = 19.8 L
T₂ = ?
Pressure is constant
Using ideal gas equation
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
[tex]\dfrac{18.5}{291.5}=\dfrac{19.8}{T_2}[/tex]
[tex]T_2 = 312 K[/tex]
[tex]T_2 = 312 -273 =39 ^\circ C[/tex]
The temperature when the chamber has a volume of 19.8 L should be considered as the 39 degrees.
Calculation of the temperature:Since
V₁ = 18.5 L
T₁ = 18.5° C = 273 + 18.5 = 291.5 K
V₂ = 19.8 L
So here the final temperature should be
V1/T1 = V2/T2
18.5 L/291.5 = 19.8 / T2
So T2 = 312 k
= 312 - 273
= 39 degrees
hence, The temperature when the chamber has a volume of 19.8 L should be considered as the 39 degrees.
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An blank is a group of organisms that can mate and produce offspring that can mate
Answer: specie
Explanation:
A specie is the smallest group of organisms with similar characteristics and are capable of living with each other and breeding together freely. They give rise to young ones (offspring) that resembles the parents and can also breed with organisms of same species.
Examples of species include
- a group of lizards
- a group of human beings etc
A species is defined as a group of organisms that can mate
Explanation:A species is a fundamental unit of biological classification. It comprises individuals that can interbreed and produce fertile offspring, sharing common characteristics. Species diversity is vital to biodiversity and plays a central role in ecology and evolutionary biology studies.
Thus, a species is a group of individual organisms that interbreed and produce fertile, viable offspring. According to this definition, one species is distinguished from another when, in nature, it is not possible for matings between individuals from each species to produce fertile offspring. This reproductive isolation is an important factor in defining species.
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If you burned 4.10 x 10^24 molecules of butane (C4H10), what mass of ethane did you burn?
Answer:
Explanation:
Molar mass of C4H10 = 12x 4 + 1 x 10= 48+ 10=58g.
Also note that molar mass of a substance is equivalent to Avogadro's number (6.02 X 10^-23)
Hence,
6.02 X 10^-23 molecules of ethane was burned in 58g of ethane
So, 4.10 X 10^24 molecules of ethane will burn in xg of ethane.
Cross multiply:
6.02 X 10^-23x = 58 X 4.10 X 10^24
6.02 X 10^-23x = 2.378 X 10 ^26
Dividing both sides by the coefficient of 'x'
x = 2.378 X 10^26/(6.02X 10^-23)
x = 3.95 X10^48g approximately
x = 4.0 X 10^48g
Or
Mole = number of elementary
particless / Avogadro's number
Where,
No of elementary particles= 4.10 X 10^24 molecules
Avogadro's number= 6.02 x 10^-23
Therefore,
Mole = 4.10 X 10^24/ (6.02 X 10^-23)
= 6.81 X 10^ 46 moles.
But mole = mass / molar mass
Mass = mole x molar mass
where
Molar mass of C4H10 = 12x 4 + 1 x 10= 48+ 10=58g/mol
Mass= 6.81 X 10^46 X 58
= 3.95 X 10^48g approximately
= 4.0 X 10^ 48g.
Thanks
The Milky Way Galaxy is one of
in the known universe.
OA) hundreds
OB thousands
C) millions
D) billions
Answer:
there are billions, and more that we haven't yet explored, it is just let the sea only a lot more floaty!
hope this helps
In the following reaction, how many moles of H2O are created when 7 moles of oxygen are consumed?
A.3 mol of CO2
B.5 mol of O2
C.72.08 grams of H2O
D.6 moles of H2O
F.1 mol of C3H8
Answer:
C
Explanation:
You can see in the chemical equation that 7 [tex]O_{2}[/tex] are used up to produce 6[tex]H_{2}O[/tex]
Why is the piece of coal layered?
Answer:
Coal is layered because it is a type of sedimentary rock
Explanation:
How many moles of calcium atoms do you have if you have 3.00 × 10²¹ atoms of calcium. (The mass of one mole of calcium is 40.08 g.)
Answer:
4.98x10^-3 mole
Explanation:
According to Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 atoms. This greatly implies that 1 mole of calcium will also contain 6.02x10^23 atoms.
Now, if 1 mole of calcium contains 6.02x10^23 atoms,
then Xmol of calcium will contain 3x10^21 atoms i.e
Xmol of calcium = 3x10^21/6.02x10^23
Xmol of calcium = 4.98x10^-3mol
Therefore, 4.98x10^-3 mole of calcium contains 3x10^21 atoms
3.00 × 10²¹ atoms of calcium are equivalent to 4.98 × 10⁻³ moles of calcium atoms.
To convert atoms to moles we need a conversion factor: Avogadro's number. According to Avogadro's number: there are 6.02 × 10²³ calcium atoms in 1 mole of calcium atoms. The number of moles corresponding to 3.00 × 10²¹ atoms of calcium are:
[tex]3.00 \times 10^{21} atoms \times \frac{1 mol}{6.02 \times 10^{23} atoms} = 4.98 \times 10^{-3} mol[/tex]
3.00 × 10²¹ atoms of calcium are equivalent to 4.98 × 10⁻³ moles of calcium atoms.
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What seems to be the general relationship between an atom's atomic number and it’s placement on the Periodic Table?
Answer:number of protons in the nucleus and number of electrons in the different shell
explained : determine the position in the periodic table. ... Their position is decided by their Atomic Number which is the number of protons in the nucleus of the atom.
Students are investigating the relationship between pressure and temperature in gases. They have blown up a balloon with carbon dioxide from an air tank and
connected the balloon to a pressure gauge. The balloon is then submerged in ice or water baths at various temperatures in order to observe the pressure level
after several minutes. What is the flaw in the student's investigation, and how can the students improve their investigation to correctly determine the
relationship?
A The volume and density of the air in the balloon can change, therefore they need to use several different balloons at different volumes to account for
how density and volume affects pressure.
B. The volume of the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air
C. The volume of the balloon can change, therefore they need to use several different balloons at different volumes to account for how volume atteots
pressure.
D. The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air
Answer:
b
Explanation:
Describe the 3 categories that the periodic table can be divided into. Be prepared to provide this information for an element on the periodic table.
Answer:
Metal, non-metal , and metaliod
Explanation:
Answer:
metal, nonmetal and metalloid
Explanation:
What is the molarity of a solution made by dissolving 50.0 g of HBr in enough water to
make 600. mL of solution?
Answer:
1.06M
Explanation:
Given parameters:
Mass of HBr = 50g
Volume of water = 600mL
unknown:
Molarity of the solution = ?
Solution:
The molarity of a substance is the number of moles of solute in a volume of solution.
Mathematically;
Molarity = [tex]\frac{number of moles }{volume}[/tex]
Since the number of moles is unknown, let us solve for it;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of HBr = 1 + 80 = 81g/mol
Number of moles = [tex]\frac{50}{81}[/tex] = 0.64mole
Convert the volume to liters or dm³; 600mL = 0.6L or 0.6 dm³
Input the parameters and solve;
Molarity = [tex]\frac{0.64}{0.6}[/tex] = 1.06M
Which best describes nuclear fission?
A. the burning of carbon
B. the decay of radioactive isotopes
C. the splitting apart of atomic nuclei
D. the release of a tiny packet of energy
Answer:
It's C.
Explanation:
Firstly, the burning of carbon produces C02, a greenhouse gas. As nuclear fission does not produce carbon dioxide, it is not A. The decay of radioactive isotopes is not fission, or spliting into 2 parts.
As fission means to split, it is C.