The energy of 800 milimoles of photons is 1.38 * 10^-19 J.
What is excitation of electrons?We know that an electron can move from a lower to higher energy level according to the formula;
1/λ = RH(1/ni^2 - 1/nf^2)
RH = 1.097 * 10^7m-1
ni = 3
nf = 6
Thus;
1/λ = 1.097 * 10^7(1/3^2 - 1/6^2)
1/λ = 1.097 * 10^7(1/9 - 1/36)
1/λ = 1.097 * 10^7(0.11 - 0.03)
λ =1.14 * 10^-6 m
v = λf
f = v/λ
f = 3 * 10^8 m/s/1.14 * 10^-6 m
f = 2.6 * 10^14 Hz
Now
E = hf
E= 6.63 * 10^-34 * 2.6 * 10^14 Hz
E = 1.72 * 10^-19 J
Now;
1 mole of photons has 1.72 * 10^-19 J of energy
800 * 10^-3 moles of photons has 800 * 10^-3 moles * 1.72 * 10^-19 J/ 1 mole
= 1.38 * 10^-19 J
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108 g HCI reacts with excess AI. What mass of AICI3 forms?
The Answer to the question is 133.34 grams approximately.
As Al is in excess so, complete HCl will consume in reaction.
Molar Mass of HCl = Atomic mass of H + Atomic mass of Cl
Molar Mass of HCl = 1 + 35.45 = 36.45
Number of moles of HCl which reacting will excess Al are
moles = given mass / molar mass
moles = 108 / 36.45 = 2.96 moles of HCl
So 2.96 moles of HCl are taking part in reaction which is approximately 3 moles
The chemical reaction is as follows as:
3 HCl + (excess) Al → AlCl₃ + 3 H
It is clear from the reaction that 3 moles of HCl are making 1 mole of AlCl₃
So in our reaction also 3 mole of HCl is taking part which mean that it will form 1 mole of AlCl₃ .
1 mole AlCl₃ = mass formed AlCl₃ / molar mass of AlCl₃
mass formed AlCl₃ = molar mass of AlCl₃
mass formed AlCl₃ = 133.34 grams
So, approximately 133.34 grams of AlCl₃ is formed when we react 108 grams of HCl with excess AlCl₃.
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Beta particles are identical to Multiple Choice protons. helium atoms. hydrogen atoms. helium nuclei.
Correct option:
Beta particles are identical to "electrons".
What are particle beams:
There are various types of particle beams, such as (alpha) and (beta) particles, neutron beams, etc. While β-particles are electrons released from a nucleus, helium nuclei made up of two protons and two neutrons are known as α-particles.
When certain radionuclides undergo a process known as beta-decay, high-energy, high-speed electrons (e-) or positrons (p+) are released from the nucleus.
An electron and a beta particle share the same mass and charge.
Beta radiation in high doses can burn the skin, and beta emitters are dangerous if they penetrate the body. Thin sheets of metal or plastic may be able to stop beta particles.
Note: Your question is incomplete, but most probably your full question also includes one more option "Electron".
Beta particles are identical to
Multiple Choice
1. protons. 2. helium atoms. 3. hydrogen atoms. 4. helium nuclei. 5. electrons.
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Prepare a project report on various samples of
a) a mixture
b) a compound
c) an element ( metal or non metal)
( 2 from each ) highlighting the main characteristics features of elements, compounds and mixtures.
detailed answer plsss
This refers to the material that is made when different substances mix up physically and causes a reaction.
You can make on the project of Mixture -
1) Alloys2)Colloids3) Suspension4) SolutionB) CompoundThis refers to the chemical bond that holds different atoms tightly
You can make on the project of Compound -
1)Water2)Methane3)Carbon Dioxide4) Sulfuric AcidC) ElementsBased on the fact that the atom is the smallest indivisible part of an element, elements like phosphorous cannot be further broken down.
You can make on the project of Elements -
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Calculate the heat released when 12.5g of water, at its freezing point, freezes.
16700 J
8350 J
4170 J
12543 J
Answer:
4170 j
Explanation:
water has low melting point
K2CO3 = K2O +
How to complete this chemical equation so that the chemical reaction is decomposition
Answer:
K2CO3 = K2O + CO2
Explanation:
In a chemical equation, the number of atoms on the left needs to be balanced with the number of atoms on the right, and there has to be the same number of the same *type* of atom on both sides as well.
On the left:
2 K
1 C
3 O
and on the right,
2 K
1 O
On the right, there are a few atoms missing, specifically, 1 C and 2 O.
The missing atoms then should be added to the side missing the atoms, preferably in a stable molecule. Luckily, CO2 contains exactly 1 C, and 2 O s, and is quite stable. So, a "CO2" has to be added on the left
what is the maximum amount of CO2
(44.0095 g/mol) which could be formed from
9.31 g of C2H2 (26.0373 g/mol) and 3.8 g of
O2 (31.9988 g/mol)?
Answer:
10.6 g CO₂
Explanation:
You have not been given a limiting reagent. Therefore, to find the maximum amount of CO₂, you need to convert the masses of both reactants to CO₂. The smaller amount of CO₂ produced will be the accurate amount. This is because that amount is all the corresponding reactant can produce before it runs out.
To find the mass of CO₂, you need to (1) convert grams C₂H₂/O₂ to moles (via molar mass), then (2) convert moles C₂H₂/O₂ to moles CO₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles CO₂ to grams (via molar mass). *I had to guess the chemical reaction because the reaction coefficients are necessary in calculating the mass of CO₂.*
C₂H₂ + O₂ ----> 2 CO₂ + H₂
9.31 g C₂H₂ 1 mole 2 moles CO₂ 44.0095 g
------------------ x ------------------- x ---------------------- x ------------------- =
26.0373 g 1 mole C₂H₂ 1 mole
= 31.5 g CO₂
3.8 g O₂ 1 mole 2 moles CO₂ 44.0095 g
------------- x -------------------- x ---------------------- x -------------------- =
31.9988 g 1 mole O₂ 1 mole
= 10.6 g CO₂
10.6 g CO₂ is the maximum amount of CO₂ that can be produced. In other words, the entire 3.8 g O₂ will be used up in the reaction before all of the 9.31 g C₂H₂ will be used.
what happens if the same zero error occurs in every reading
Zero error occur in every reading means that the measuring instrument needs to recalibrated and adjusted.
What is Zero error?This error occurs when a measuring instrument reflects a digit which isn't zero despite the real value being zero.
When this occurs, only the zero screw on the device should be adjusted so as to correct this technical error. This is why recalibration should be the most appropriate solution.
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hi I really need help with this.
Balance the following neutralization reactions:
_______ HBr + _______ KOH _______KBr + _______H2O
_______ HF + _______ Fe(OH)3 _______FeF3 + ______ H2O
______HCl + _______ Ca(OH)2 _______CaCl2 + ______ H2O
Answer:
Explanation:
In order to balance equations, simply alter coefficients until all elements are equal on both sides of the reaction symbol ”—>”:
1HBr + 1KOH —> 1KBr + 1H2O
The reaction is already balanced
3HF + Fe(OH)3 —> FeF3 + 3H2O
To match the 3 Flluorines on the right hand side, add 3 to HF and then add 3 to H2O to compensate for the increase in hydrogens.
2HCl + Ca(OH)2 —> CaCl2 + 2H2O
The Chlorine must be balanced, and then hydrogen must be balanced.
Hope this helps! If it did, I would appreciate if you provided brainliest!
How many grams of carbon are contained in one mole of C3H8? (Report your
answer to two places past the decimal point. Moodle is looking for a number
only, no units.)
There are 44 grams of carbon contained in one mole of C3H8. Details about mass can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of a substance by its molar mass.
According to this question, one mole of propane (C3H8) was given.
Molar mass of C3H8 = 12(3) + 1(8) = 44g/mol
Mass of C3H8 = 44g/mol × 1 = 44g
Therefore, there are 44 grams of carbon contained in one mole of C3H8.
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A mass of 26.1 g of an element is known to contain 6.87 x 1023 atoms. What is the atomic mass of the element
Using Avogadro's law, we know the amount of moles in the sample is
[tex]\frac{6.87 \times 10^{23}}{6.022 \times 10^{23}}=1.1408170043175 \text{ mol}[/tex]
Therefore, the atomic mass is:
[tex]\frac{26.1}{1.1408170043175}=\boxed{22.9 \text{ g/mol (to 3 sf)}}[/tex]
chemistry
state two industrial uses of hydrogen
Answer:
refining petroleum, treating metals, producing fertilizer, and processing foods.
I2 (s) has a very low solubility in H2O (l) because the weak _____ forces between I2 and H2O are not strong enough to replace the _____ between the H2O molecules.
I2 (s) has very low solubility in H2O (l) because the weak dipole-induced dipole forces between I2 and H2O are not strong enough to replace the hydrogen bonds between the H2O molecules.
Dipole interactions are susceptible interactions that get up from the close association of permanent or precipitated dipoles. Collectively these forces are called Van der Waals interactions. Proteins incorporate a massive number of these interactions, which vary substantially in energy.
Solubility depends on the solvent's capacity to overcome the intermolecular forces in a solid. Red blood cells have an excessive concentration of dissolved ions. When positioned into pure water they rupture.
Polar species are soluble in water, whilst nonpolar species are soluble in oils and fats. Covalent solubility uses the like dissolves like a rule. This means that materials with an equal form of polarity might be soluble in one another. moreover, compounds with differing polarities might be insoluble in one another.
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what are the properties of most transition metals
Explanation:
The transition metals have the following physical properties in common:
they are good conductors of heat and electricity
they can be hammered or bent into shape easily
they have high melting points (but mercury is a liquid at room temperature)
they are usually hard and tough
they have high densities
The transition metals have the following chemical properties in common:
they are less reactive than alkali metals such as sodium
they form coloured ions of different charges
some are very unreactive (silver and gold)
many are used as catalysts
_______ can travel through solid, liquid, and gaseous materials, whereas _______ can travel only through solid materials.
Sound can travel through solid, liquid, and gaseous materials, whereas S-Waves can travel only through solid materials.
What is Sound ?Sound is a form of energy. Sound moves through matter that is solid, liquid, and gas. In a vacuum sound cannot travel. In solids sound can travel more quickly as compared to liquid and gases because in solids molecules are closer together.
What is S- Waves ?S-Waves are shear waves. These are the waves of high frequency and short wavelength. S- Waves can travel only through solid materials.
Thus from the above conclusion we can say that Sound can travel through solid, liquid, and gaseous materials, whereas S-Waves can travel only through solid materials.
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calculate no. of molecules in a spherical drop of water... radius = 0.1 mm and density of water = 1g/cm²
Answer:
1.49X10^20
Explanation:
hope this helps (´･ω･`)
What would this frequency become if the person's breathing passage were filled with carbon dioxide instead of air
What happens when carbon dioxide builds up in your lungs?
If the person's breathing passage were filled with carbon dioxide instead of air, it would lead to respiratory failure.
Signs of respiratory failure:
The symptoms of respiratory failure depend on the cause and the levels of oxygen and carbon dioxide in your blood.The inability to breathe in enough air and shortness of breath are both signs of low blood oxygen levels. Your fingernails, skin, and lips could all be blue in hue. Rapid breathing and confusion can occur when there is a high carbon dioxide level.Those who experience respiratory failure can lose consciousness or become extremely tired. Arrhythmia (irregular heartbeat) may also exist in them. If your brain and heart aren't getting enough oxygen, you can experience these symptoms.Learn more about respiratory failure here,
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A) If an atom has 13 protons how many electrons will it have justify your answer
B) nucleus of an atom consists electrons. Do you agree with this statement? Justify your answer
Answer:
13
Explanation:
because the number of protons and electrons in the atom are the same
Rank protons, neutrons, and electrons according to their mass. Identify the charge of each and their location
Answer:
discuss the successes and the short comings of the conservative reaction to the french rvolution as seen in the actions of the congress of vienna and the holy aliance?
Which kind of investigations allow for the control of variables?
Ohypothesis
O experimental
O descriptive
O comparative
Answer:
B.) Experimental
Explanation:
in an experimental investigation you have control over different variables you are testing so that makes this the most accurate answer.
The kind of investigation that allows for the control of variables is an experimental investigation.
In an experimental investigation, researchers manipulate or control certain variables while keeping others constant. This allows them to determine the cause-and-effect relationship between variables.
To conduct an experimental investigation, researchers typically follow these steps:
1. Formulate a hypothesis: A hypothesis is a testable statement that predicts the relationship between variables. It provides the basis for the experiment.
2. Identify variables: Variables are the factors or conditions that can be manipulated or measured in an experiment. In an experimental investigation, researchers typically have an independent variable and a dependent variable .
3. Control variables: In order to isolate the effect of the independent variable on the dependent variable, researchers need to control or keep constant other variables that could potentially influence the results. This ensures that any changes observed in the dependent variable can be attributed to the independent variable.
4. Design the experiment: Researchers design an experiment that allows them to manipulate the independent variable and measure the dependent variable. They may use control groups, randomization, and other techniques to minimize bias and ensure reliable results.
5. Collect and analyze data: Researchers collect data by conducting the experiment and measuring the dependent variable. They then analyze the data using statistical techniques to determine if there is a significant difference between groups or conditions.
By controlling variables in an experimental investigation, researchers can draw valid conclusions about the relationship between the independent and dependent variables. Thus, the correct answer is experimental investigations.
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Step 8: Measure Pressure and Volume with the Book
and 3 kg of Weight
Total the mass on the syringe. Record it in the
correct row of the data table.
kg
According to Boyle's law of gases, the volume of the gas will decrease when increasing the pressure of the gas in the syringe by adding weights above the syringe.
What is the statement of Boyle's law?Boyle's law of gases states that the pressure of a given mass of gas is inversely proportional to the volume of the gas.
In the given, increasing the pressure of the gas in the syringe by adding weights above the syringe will result in a decrease in the volume of the gas.
On the other hand, decreasing the pressure will result in an increase in the volume of the gas.
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Answer:
1. 3.498
2. 1.37
3. 37.5
4. 51.4
Explanation:
The table shows the nature of the reactants and products formed in a certain type of chemical reaction. Nature of Reactants and Products Reactants Products Ionic compound + Ionic compound Ionic compound + Ionic compound Which of the following is true about this type of chemical reaction? (4 points) Group of answer choices It is a single replacement reaction, and all four compounds are different. It is a double replacement reaction, and all four compounds are different. It is a single replacement reaction, and each compound has the same set of ions. It is a double replacement reaction, and each compound has the same set of ions.
The given reaction is a double replacement reaction; option B.
What is a chemical reaction?A chemical reaction is a reaction in which chemical changes occurs in the atoms of reactants which results in the formation pf products.
The given reaction is as follows:
Ionic compound + Ionic compound ---> Ionic compound + Ionic compoundSince exchange of ions occur, it is a double replacement reaction.
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A solution is made by dissolving 3.14 g of NaCl in 79.9 mL of water. What is the concentration of sodium chloride in units of weight/volume percent? Group of answer choices 3.78% (w/v) NaCl 96.1% (w/v) NaCl 3.93% (w/v) NaCl 0.0393% (w/v) NaCl
The concentration of sodium chloride in units of weight/volume percent is 3.93g/ml
Given that
3.93 (w/v) NaCl
Weight NaCl = 3.14g
Volume of water = 79.9mL
W/V is usually represented in g/mL, so no need to change anything
3.14g/79.9mL *100 = 3.93 g/mL (%)
One mole of NaCl contains 6.022 x 10 23 NaCl formula units.
• Use the mole quantity to count formulas by weighing them.
• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023
• The mass of an atom in amu is numerically the same
as the mass of one mole of atoms of the element in grams.
• One atom of sulfur has a mass of 32.07 amu;
one mole of S atoms has a mass of 32.07 g.
Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g
Mass of 1 mole of H atoms:
1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g
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25. An equilibrium mixture of SO2 (g), O2 (g), and SO3 (g) is transferred from a 1.00L flask to a 2.00-L flask. In which direction does the reaction proceed to restore equilibrium
This chapter deals with chemical equilibrium, or how far chemical reactions proceed. Some reactions convert reactants to products with near 100% efficiency but others do not.
Chemical equilibrium is a dynamic process and occurs when the rates of two opposing processes (reactions) become the same. Unless conditions are somehow changed, the concentrations of both reactants and products remain constant after equilibrium is achieved.
Consider the decomposition reaction in which N2O4 (g) ' 2 NO2(g) What happens to the concentration of each, based upon the rate equations, as the reaction proceeds
Assuming reversible elementary processes, Rate (forward) = k (forward) x [N2O4] and rate (reverse) = k (reverse) x [NO2]2As [N2O4] decreases, rate forward decreases, and, as [NO2] increases, rate reverse increases, but more quickly.
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Determine the partial pressure and number of moles of each gas in a 15.75-L vessel at 30.0 C containing a mixture of xenon and neon gas only.
The Partial pressure of Xe and Ne will be 4.95 atm and 1.55 atm. The number of moles of Xe and Ne will be 3.13 and 0.981
Computation of partial pressure and number of moles:
Let the total pressure of the vessel= 6.5 atm and mole fraction of Xenon= 0.761
As we know,
[tex]\chi_{Ne} + \chi_{Xe} = 1\\\chi_{Ne}= 1- 0.761\\\chi_{Ne}= 0.239[/tex]
According to Dalton's Law of partial pressure-
[tex]P_i=\chi_i\times P_{total}[/tex]
Where,
[tex]P_i=[/tex]The pressure of the gas component in the mixture
[tex]\chi_i=[/tex] Mole fraction of that gas component
[tex]P_t=[/tex] The total pressure of the mixture
[tex]P_{Xe}=(0.761)\times(6.5)\\P_{Xe}= 4.95 atm\\\\\\P_{Ne}=(0.239)\imes (6.5)\\P_{Ne}= 1.55 atm[/tex]
Calculation:
To calculate the number of moles,
PV=nRT
[tex]n=\frac{PV}{RT}[/tex]
[tex]n_{Xe}= \frac{4.95\times 15.75}{0.0821\times303 }\\ n_{Xe}= \frac{77.96}{24.87} \\n_{Xe}= 3.13\,mole \\\\\\n_{Ne}= \frac{1.55\times 15.75}{0.0821\times303 }\\\\n_{Ne}=\frac{24.41}{24.87}\\ n_{Ne}=0.981 \,mole[/tex]
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A 1.50 g sample of a pure compound, containing only carbon and hydrogen, was
combusted in a carbon-hydrogen combustion analyzer. The combustion
produced 2.7 g of water (H₂O) and 4.4 g of carbon dioxide (CO₂.)
Calculate the mass of hydrogen.
Select one:
a. 2.001 g
b. 0.001 g
c.0.302 g
d. 1.192 g
The mass of the hydrogen is obtained as 0.302 g.
What is the mass of hydrogen?A hydrocarbon is a compound that contains only carbon an hydrogen. The amount of the carbon and the hydrogen can be found by combustion.
The mass of hydrogen can be obtained as follows;
Number of moles of hydrogen =2.7 g/18 g/mol * 2 = 0.302 moles
Now the mass of hydrogen is obtained from;
0.302 moles * 1 g/mol = 0.302 g
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1. How many grams of iron (II) oxide can be produced from 3.4 g of iron in this balanced equation?
4Fe +3022Fe₂O3
2. How many grams of magnesium carbonate is produced from 6.7 g of magnesium oxide in this
balanced equation?
MgO + CO₂ → MgCO3
3. How many grams of calcium hydroxide is produced from 9.4 g of calcium chloride in this balanced
equation?
CaCl₂ + 2NaOH → 2NaCl + Ca(OH)2
Answer:
3.12g FeO3
14.33g MgCO3
5.92g Ca(OH)2
Explanation:
For the first problem, convert grams of Fe to mols of Fe.
molar mass of Fe: 55.845
Grams of Fe: 3.4g
3.4/55.845 = 0.06 mol Fe
There are 4 Fe for every 2 FeO3
So.. 0.06(2/4) = 0.03 mol FeO3
Multiply the mols by the molar mass of FeO3
Molar mass of FeO3: 103.845
0.03 * 103.845 = 3.12 g FeO3
1.25 grams of unknown acid was dissolved in 15.00 mL of water and then titrated with 0.100 M NaOH(aq). The
equivalence point was reached after 20.00 mL of the NaOH solution had been added. Using the data determine
What is the molar mass of the acid?
The molar mass of the acid, given the data is 625 g/mole
What is equivalence point?This is a point is a titration reaction where the amount of the acid added is enough to neutralize the base
This simply implies that the number of mole of the acid used is equal to the number of mole of the base.
How to determine the mole of the baseVolume of base (NaOH) = 20 mL = 20 / 1000 = 0.02 LMolarity of base (NaOH) = 0.1 MMole of base (NaOH) = ?Mole = molarity × volume
Mole of base (NaOH) = 0.1 × 0.02
Mole of base (NaOH) = 0.002 mole
How to determine the molar mass of the acidMole of base (NaOH) = 0.002 moleMole of acid = Mole of base (NaOH) = 0.002 moleMass of acid = 1.25 gMolar mass of acid =?Molar mass = mass / mole
Molar mass of acid = 1.25 / 0.002
Molar mass of acid = 625 g/mole
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1
How many individual oxygen atoms are contained in a sample of P₂O5 that also
contains 0.620 moles of P? (Input your answer with scientific notation using "e
9.331 x [tex]10^{23}[/tex] many individual oxygen atoms are contained in a sample of P₂O5 that also contains 0.620 moles of P.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
[tex]P_2O_5[/tex] → [tex]2P^+{^5} + 5O{^-^2}[/tex]
Given:
0.620 moles of P
Let us assume a mole of oxygen atoms.
2÷0.620 = 5÷a Cross Multiply
2a = 0.620 x 5 Divide both sides by 2
a= 0.310 x 5 Combine
a = 1.55 moles of oxygen.
Atoms are there in 1.55 moles of oxygen:
1 mole of anything contains 6.02 x [tex]10^{23}[/tex] items of that mole
1.55 moles of oxygen contain x atoms of oxygen
1÷1.55 = 6.02 x [tex]10^{23}[/tex] ÷x Cross multiply
1 x a = 1.55 x 6.02 x [tex]10^{23}[/tex] Combine
a = 9.331 x [tex]10^{23}[/tex]
Hence, 9.331 x [tex]10^{23}[/tex] many individual oxygen atoms are contained in a sample of P₂O5 that also contains 0.620 moles of P.
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2. A gas is confined in a syringe. When the volume of the cylinder is 750 L the pressure is
150 kPa. What will the volume of the cylinder be when the pressure has risen to 250
kPa?
Answer:
450 L
Explanation:
Because you are dealing with pressure and volume, you want to use Boyle's Law to find your missing value. The equation looks like this:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and temperature. To find the final volume, you can plug the given values into the equation and simplify.
P₁ = 150 pKa P₂ = 250 pKa
V₁ = 750 L V₂ = ? L
P₁V₁ = P₂V₂ <----- Boyle's Law equation
(150 pKa)(750 L) = (250 pKa)V₂ <----- Insert variables
112500 = (250 pKa)V₂ <----- Multiply 150 and 750
450 L = V₂ <----- Divide both sides by 250
A garbage collector collects food wrappers and aluminum cans from a park. what type of waste is the garbage collector collecting?
Answer:
Explanation:
Food wrappers and aluminium wrappers are widely use for packing various eatable items.
For example, in our homes our mother wraps our food for lunch in aluminium foil.
As it helps in keeping the food warm for hours.
Thus, we can conclude that out of the given options, a packaging waste is the garbage collector collecting.