Answer:
d. Valence electrons are found in the nucleus.
Explanation:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom.
The other 3 statements are correct.
What process is being shown in this diagram?
precipitation
metathesis
dissolution
combustion
The process shown in the given diagram is the dissolution process. Therefore, option (C) is correct.
What is the dissolution process?When a solid solute will be added to a solvent, the solute particles will dissolve in the solvent and this process is called dissolution. Solute particles collide with each other in the solution and particles get separated out, this process is called crystallization.
A state of dynamic equilibrium can be established between these two processes and the number of solute molecules entering the solution becomes equal to the number of particles leaving.
No more solute can dissolve in the solvent at a given temperature is said to be a saturated solution as the solution consists of the maximum amount of solute. If more solute can be added to a solution is known as an unsaturated solution.
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Electrons further from the nucleus are partially shielded from the pull of the nucleus.
True
False
6. What is the enthalpy of vaporization of a compound that has a vapor pressure of 157 mmHg at 253
K and 0.358 mmHg at 191 K? (R-8.31 J/(K mol))
3.13 kJ/mol
0.838 kJ/mol
815 kJ/mol
39.4 kJ/mol
389 kJ/mol
a)
b)
d)
e)
The enthalpy of vaporization can be determined using the Clausius -Clapeyron equation. For the given conditions, the enthalpy of vaporization is 39 kJ/mol.
What is Clausius -Clapeyron equation?Clausius -Clapeyron equation relates the enthalpy of vaporization with the change in pressure and temperature by the expression given below:
[tex]\rm ln \frac{P_{2}}{P_{1}} = \frac{\Delta H }{R} [\frac{1}{T_{1}} - \frac{1}{T_{2}} ][/tex]
Given that, P1 = 157 mmHg
P2 = 0.358 mmHg.
T1 = 253 K and T2 = 191 K.
Apply all these values in Clausius -clapeyron equation
[tex]\rm ln \frac{157 mmHg}{0.358 mmHg} =\frac{\Delta H}{8.31 J/(K mol)} [\frac{1}{253 K} - \frac{1}{191 K} ][/tex]
ΔH = 39 KJ/mol.
Therefore, the enthalpy of vaporization of the compound is 39 KJ/mol.
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suppose 0.086 mol of br2 is placed in a 1.26 l flask and heated to 1756 k, a temperature at which the halogen dissociates into atoms:
The halogen dissociates into atoms at 1756 K : the dissociation is 3.7 %. The value of Kc is 3.8 × 10⁻⁴.
the reaction is given as:
Br₂(g) ⇄ 2Br(g)
moles of Br₂ = 0.086 mol
volume = 1.26 L
concentration of [Br₂] = 0.086 / 1.26
= 0.0682 M
Br₂(g) ⇄ 2Br(g)
initial 0.0682 0
-x 2x
eq. 0.0682 - x 2x
the dissociation = 3.7 %
x = 0.0682 × 0.037
x = 0.00252
the equilibrium constant Kc is given as :
Kc = [Br]² / [Br₂]
Kc = ( 2 × 0.00252 )² / ( 0.0682 - 0.00252 )
Kc = 3.8 × 10⁻⁴
Thus, suppose 0.086 mol of Br₂ is placed in a 1.26 l flask and heated to 1756 k, a temperature at which the halogen dissociates into atoms: the dissociation is 3.7 % .then the value of Kc is 3.8 × 10⁻⁴.
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what species are present in solution following the complete neutralization of sulfuric acid with potassium hydroxide?
Answer:
H2SO4 + 2KOH → K2SO4 + 2H2O
Explanation:
In a neutralization reaction between an acid and a base, the positive ion from the base and the negative ion from the acid usually form a salt. In this case, the positive potassium ion (K+) bonds with the polyatomic sulfate ( S O 2 4 ) to form the salt K 2 S O 4.
The water H O H or H 2 O is formed by the positive hydrogen (H + ) ion from the acid and the negative hydroxide ion (OH) from the base.
How many moles is equal to 44.27 grams of CO2?
Answer: 1.005919176541433
Explanation:
44.27 grams of CO2 is 1.0059 moles
as per given in the question,
the mass of [tex]Co_{2}[/tex] is given as 44.27g
need to find how many moles are equal to 44.27g
The molar mass of 1 mole of
[tex]Co_{2}[/tex]= Molar mass of C +2 x Molar mass of O
[tex]Co_2[/tex] = 12 + 2 x 16
[tex]Co_2[/tex]= 12 + 32 = 44 g
=> 44 gm of [tex]Co_2[/tex] = 1 mole of [tex]Co_2[/tex]
so, now 44.27 g of [tex]Co_2[/tex] is equal to [tex]\frac{given\ weight}{weight\ of \ 1 mole\ of\ compound }[/tex]
i.e,
number of moles of [tex]Co_2[/tex] = [tex]\frac{44.27}{44}[/tex]
number of moles of [tex]Co_2[/tex] = 1.0059 moles
the number of moles of 44.27 grams of [tex]Co_2[/tex] is 1.0059 moles
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This graph shows the melting and boiling points of the alkali metals. Think about Francium, do you think it would have a higher or lower melting/boiling
point than lithium? Why? Can you predict it from the data?
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, due to larger atomic size, francium has lower melting and boiling point than lithium.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Francium has lower melting and boiling point than lithium because of the larger atomic size, due to which lattice energy becomes low.
Therefore, due to larger atomic size, francium has lower melting and boiling point than lithium.
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F
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1
2
3
4
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ab-ad-pradజి *06 C
Return
3 points
You are starting your own business. Congratulations! A bank has reviewed your business plan with you and has created a model of the expected value of your
company. The graph shows the expected value (y) in hundreds of thousands of dollars over bx years.
What are the zeros of the function and what do they mean for your company?
Answer:yes
Explanation:
Question 8
How many grams are in 3.9 moles of C3H5C13?
1
Answer:
Explanation:
To determine the number of grams in 3.9 moles of C3H5C13, we need to first determine the molar mass of C3H5C13. The molar mass of a substance is the mass of one mole of the substance, and it is calculated by adding up the atomic weights of all the atoms in the molecular formula.
In the case of C3H5C13, the molar mass is calculated as follows:
Molar mass of C3H5C13 = (3 x 12 g/mol) + (5 x 1 g/mol) + (13 x 35.5 g/mol) = 106.5 g/mol
Next, we need to multiply the molar mass by the number of moles to determine the number of grams:
3.9 moles x 106.5 g/mol = 421.05 g
Therefore, there are 421.05 grams in 3.9 moles of C3H5C13.
What do I write for 3
The above model is a good representation of a molecule because it clearly displays the atoms (white and black circles) and the chemical bond sticks that are present in the atom.
A drawback of the above model is that it does not show clearly the various freedom of movement that may be found in molecules nor does it show the movement of electrons.
The model can be improved by designing it to have relative freedom between the bond to indicate the freedom of movement of bonds.
What are scientific models?Scientific models are structures that are used to represent or explain scientific concepts.
Scientific models may be pictures, three-dimensional objects, illustrations., etc.
Scientists use different models to represent concepts or ideas. For example, the planetary model of the atom, and the ball and stick model of molecules.
The ball and stick model shows the atoms and the bonds that are present in the compound.
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which of the indicated protons in the following compound would appear most upfield in the 1h nmr spectrum?
P1 proton in the compound appear most upfield in the 1H NMR spectrum.
What is the main principle of NMR?
The foundation of NMR is the idea that all nuclei are electrically charged and that many of them have spins. Energy can go from the base energy to a higher energy level if an external magnetic field is provided.
The protons are most shielded ones among all the four types of protons as they experience +I effect from adjacent CH2 groups and are also situated far away from carbonyl group. therefore the -I effect is very less compared to the protons 2, 3 and 4. all these factors makes the proton 1 the most shielded and hence they will have very low delta value that is upfield.
Therefore, P1 proton in the compound appear most upfield in the 1H NMR spectrum.
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identify the types of business activities or operation
The types of business activities or operation are:
operatinginvesting financing.What are types of business activities ?The main types of business activities can be seen as the operating, investing, as well as the financing.
Investing business activities can be described as one that is capitalized over more than one year and it involves how the purchase of long-term assets is made and it can be recorded as a use of cash in the section.
Operating activities can be described a the daily activities of a company which could encompass the process of producing and selling its product, generating revenues, a which can aswell involves the maintenance activities.
Financing activities can be described as the transactions between a business as well as the lenders and owners to acquire or return resources it can be seen as the activities to fund the company, repay lenders.
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what’s is the answer?
The energy of the photon of light can be obtained as 6.27 * 10^-20 J.
What is the energy of the photon?We know that a photon has to to do with a particular unit of light. We know that light can be said to be composed of very tiny corpuscles and these corpuscles of light is what we call the photon of the light.
We can be able to us the equation that is derived by Max Plank to be able to get the value of the energy of the photon of light. Now we know that a photon of light can have an energy that is able to be obtained by;
E = hf
h = Plank's constant
f = Frequency
Then;
E = 6.6 * 10^-34 Js * 9.5 * 10^13 Hz
= 6.27 * 10^-20 J
Thus as we can see from the parameters in the question, the energy of the photon is 6.27 * 10^-20 J.
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What is the
S.I
units for 2NO₂
Answer: SI unit: joule); P is pressure
Explanation: i thinks this is right
How much is 3040mmHg in atm? round to the nearest whole number
A pressure of 3040 mmHg is almost 4 atm.
Define ATM pressure?Atmospheric pressure (atm) is the unit of measurement corresponding to the mean atmospheric pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit). Atmospheric pressure is most commonly approximated by the hydrostatic pressure caused by the weight of the air above the point of measurement. Atmospheric pressure decreases with altitude because the air mass above decreases as altitude increases. Since the atmosphere is thin relative to the Earth's radius (especially the dense atmospheric layers at low altitudes), gravitational acceleration as a function of altitude can be approximated as constant and contributes little to this decrease. Pressure is measured as force per unit area in SI units of Pascal (1 Pascal = 1 Newton per square meter, 1 N/m²). Atmospheric pressure at sea level is 760 cm Hg.
Given the,
3040mmHg pressure
1 mmHg = 0.00131579 atmospheres
3040 mmHg = 3040 x 0.00131579 atmospheres
3040 mmHg = 4.0000016 atmospheres
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If an unknown mass of aluminum dropped into a solution of CuCl2 * 2H20, and the temperature change was 11 degrees Celsius, what would have been its mass
Aluminum and copper(II) chloride react very vigorously, causing the reaction mixture to become extremely hot as heat is produced, the aluminum foil to disintegrate, a reddish brown solid to appear, and gas bubbles to be released.
What is copper chloride ?The chemical compound with the formula CuCl2 is copper(II) chloride. Anhydrous form is yellowish brown, but it slowly takes on moisture to become a dihydrate that is blue-green. The extremely uncommon minerals tolbachite and eriochalcite both naturally occur in the anhydrous and dihydrate forms.
The limiting reagent will be copper (II) chloride. The mole ratio is the most crucial tool you'll have to tackle this problem, or any other stoichiometry problem, for that matter. Keep in mind that in order to make 3 moles of copper from 3 moles of copper (II) chloride, you need 2 moles of aluminum.
Thus, Aluminum and copper(II) chloride react very vigorously, causing the reaction mixture to become extremely hot as heat is produced.
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Which statement is Wrong regarding retrograde motion?
A. Earth has retrograde motion observing from Mars
B. It is readily explained by Heliocentric model
C. Mars has retrograde motion observing from Earth
D. It is apparent motion of the planets in the opposite direction
When viewed from Mars, the Earth is moving backward. The Heliocentric model easily explains it. ОB. When seen from Earth, Mars is moving backward.
What's the right way to explain retrograde motion?In astronomy, retrograde motion refers to a body's actual or apparent motion in the opposite direction from the majority of solar system objects or other astronomical systems having a favored direction of motion.
When Mars is retrograde, does it actually alter course?Mars will pivot to journey westward instead of its customary eastward through the constellations when it enters retrograde motion. All of the outer planets of the solar system occasionally experience this orientation change, a few months before they come into opposition.
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How is density different than weight?
Answer:
Density is the substance's mass per unit of volume. The symbol most often used for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume.
Weight is a body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing.
Consider an electrochemical cell formed from a Cu(s) electrode submerged in an aqueous Cu(NO_3)_2 solution and a Cd(s) electrode submerged in a Cd(NO_3)_2(aq) solution. The two electrodes are connected by a wire and the two solutions are connected by a salt bridge containing NaNO_3(aq). The following reaction takes place: Cu^2+(aq) + Cd(s) rightarrow Cu(s) + Cd^2+(aq) Which statement describes how the electrons or nitrate ions will flow? electrons will flow from Cu(s) to Cd(s) nitrate ions will flow from Cu compartment to Cd compartment nitrate ions will not flow between compartments nitrate ions will flow from Cd compartment to Cd compartment
Option B is the right answer, Nitrate ions will flow from Cu compartment to Cd compartment.
Define electrochemical cell.
An electrochemical cell is a device that uses electricity to induce a nonspontaneous process or to generate electricity from a spontaneous oxidation-reduction reaction.
Since in the given reaction Cu2+ is going to reduce to Cu and Cd is going to oxidize to Zn2+ . Electrons and cadmium ions will move towards cathode where reduction occurs.
And nitrate ions will move towards anode to maintain a neutral charge, where oxidation occurs.
So, nitrate will flow from Cu compartment to Cd compartment.
Therefore, option B is the right answer, Nitrate ions will flow from Cu compartment to Cd compartment.
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A metallic ion is known as a..
which of the following cofactors would be required to transfer a carboxyl group onto pyruvate to form oxaloacetate?
The cofactors would be required to transfer a carboxyl group onto pyruvate to form oxaloacetate is biotin.
What is pyruvate carboxylase?Pyruvаte cаrboxylаse (PC) is а mitochondriаl enzyme bound to biotin thаt cаtаlyzes the conversion of pyruvаte to oxаloаcetаte when аbundаnt аcetyl CoА is аvаilаble, replenishing Krebs cycle intermediаtes in the mitochondriаl mаtrix. PC pаrticipаtes in gluconeogenesis, lipogenesis, аnd neurotrаnsmitter synthesis.
Pyruvate carboxylase is found in the mitochondria and catalyzes the following reaction:
Pyruvate + CO2 + ATP → oxalacetate + ADP
Your question is incomplete, but most probably your full question was
Which of the following cofactors would be required to transfer a carboxyl group onto pyruvate to form oxaloacetate?
A. Thiamine pyrophosphate
B. Tetrahydrofolate
C. Ascorbic acid
D. Cobalamin
E. Biotin
Thus, the correct answer is E.
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Which of the following statements is true for ideal gases but is not always true for real gases?
(Select all that apply.)
a) Average molecular kinetic energy increases with temperature.
b) Replacing one gas with another under the same conditions has no effect on pressure.
c) There are no attractive forces between molecules.
d) Pressure is caused by molecule-wall collisions.
Replacing one gas with another under the same conditions, has no effect on pressure is true for ideal gases but is not always true for real gases.
What are ideal gases?A theoretical gas known as an ideal gas is made up of several randomly drifting point particles with no interparticle interactions. Because it complies with the ideal gas law, a condensed state equation and can be examined using statistical mechanics, the ideal gas concept is helpful.
Is nitrogen an ideal gas?Therefore, at room temperature (273 K), nitrogen is an acceptable "ideal gas," although CO2 and H20 may both be condense into liquids at the same temperature by applying pressure.
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How many calories from alcohol are in a Margarita containing 12 grams of alcohol? Select the correct formula from the drop-down menu and read the units carefully. a. 12 g x 7 kcals/g = 84 kcals b. 12 g x 10 kcals/g = 120 kcals c. 12g x 6 kcals/g = 72 kcals d. 12 g x 4 kcals/g = 48 kcals e. 12 g x 5 kcals/g = 60 kcals f. 12 g x 9 kcals/g = 108 kcals
The calories from alcohol are in a Margarita containing 12 grams of alcohol is 84 kcals. Hence, option A is correct.
Margarita can be served on the rocks (with ice) or frozen. Margaritas can be also made with different flavors, such as strawberry, raspberry, or mango. The alcohol content present in margarita can vary from 0% (a vir.gin margarita) to 55% (a super-sized margarita). But basically the average alcohol content of a margarita is around 18-25%.
Calories per gram of alcohol = 7 kcal
Here, the Margarita contains 12 g of alcohol in it.
Hence, total calories of alcohol = 12 x 7 = 84 kcals.
Hence, the calories from alcohol are in a Margarita containing 12 grams of alcohol is 84 kcals.
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In what order would you put these stages of melting candle wax, for the correct answer?
Liquid wax heating
Melting
Boiling
Gaseous wax heating
Solid Wax heating
Answer:
The correct order for the stages of melting candle wax is:
Solid wax heatingMeltingLiquid wax heatingBoilingGaseous wax heatingExplanation:
An inlet stream consisting of 20% CH, and 80% water is fed into a continuous evaporator. The substances after the reaction will pass through the condenser, knowing the condenser's output consists of two streams, the steam stream containing C, H, CH3OH and water; dong long consists of the remains of C2H, CHOH and water. The vapor leaving the condenser cell will be recirculated and mixed with the original inlet stream before entering the reaction cell. Let the reaction take place as follows:
The vapor leaving the condenser cell will be recirculated and mixed with the original inlet stream before entering the reaction cell.
What is Thermal pollution?Thermal pollution is a term use to describe the final result caused from the water used as a coolant by power plants and/or industrial companies. It changes the water temperature and its quality. The substances after the reaction will pass through the condenser.
It is usually caused from humans or companies especially manufacturing companies - They use it for their personal needs. The end product of the water after being discarded is Thermal Pollution.
Therefore, The vapor leaving the condenser cell will be recirculated and mixed with the original inlet stream before entering the reaction cell.
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Calculate the number of particles in 5.60 moles of ammonium sulfate.
The number of particles in 5.60 moles of ammonium sulfate is equal to 5.06 × 10²⁵ atoms.
What is Avogadro's number?Avogadro’s number expresses the number of chemical entities in one mole of a given substance. Generally, Avogadro’s number can express electrons, protons, molecules, atoms, and ions, depending upon the type of chemical reaction or reactant.
The value of Avogadro’s constant is found to be approximately equal to 6.022× 10²³ mol⁻¹.
Given, the number of moles of ammonium sulfate. = 5.60 mol
The molecular formula of ammonium sulfate is (NH₄)₂SO₄.
Number of molecules of ammonium sulfate in one mole = 6.022 × 10²³
The number of atoms in ammonium sulfate in one molecule = 15
Number of atoms of ammonium sulfate in one mole = 15× 6.022 × 10²³
The number of particles in 5.60 mol in (NH₄)₂SO₄ = 15× 6.022 × 10²³×5.60
= 5.06 × 10²⁵ atoms
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What mass (in grams) of fructose (C6H12O6) is contained in 125ml of a 0.500M fructose solution?
Taking into account the definition of molarity and molar mass, the mass of fructose contained in 125ml of a 0.500M fructose solution is 11.43 grams.
Definition of molarityMolarity is a measure of the concentration, which indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
molarity= number of moles of solute÷ volume
Molarity is expressed in units moles/L.
Molar massThe molar mass of substance is defined as its mass per unit quantity of substance. In other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of fructoseIn this case, you have:
Molarity: 0.500 MNumber pf moles of fructose= ?Volume= 125 mL= 0.125 mL (being 1000 mL= 1 L)Replacing in the definition of molarity:
0.500 M= number of moles of fructose÷ 0.125 L
Solving:
0.500 M× 0.125 L= number of moles of fructose
0.0635 moles= number of moles of fructose
Being the molar mass of fructose 180 g/mole, the mass of the compound can be calculated as:
mass= molar mass× number of moles of fructose
mass= 180 g/mole× 0.0635 moles
mass= 11.43 grams
Finally, the mass of fructose is 11.43 grams.
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Which of the following is not one of the metal ores formed by contact metamorphism?
A) Zinc B) Lead C) Bauxite D) Copper
a)Zinc is not one of the metal ores formed by contact metamorphism.
what is metamorphism?
The process of metamorphism involves changing the protolith, an existing rock, into a new rock with a different mineral composition or texture. The rock remains essentially solid throughout the metamorphism process, which happens at temperatures between 150 and 200 °C (300 and 400 °F), as well as frequently at high pressures or in the presence of chemically active fluids. Weathering and diagenesis, which are changes that occur at or near the Earth's surface, are not the same as metamorphism. Metamorphism can take many different forms, such as regional, contact, hydrothermal, shock, and dynamic metamorphism. The typical temperatures, pressures, and rates at which they occur, as well as the degree to which reactive fluids are involved, vary between these.
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Vibrations of the hydrogen molecule can be H2modeled as a simple harmonic oscillator with the spring constant k=1.13x10^3N/m and mass m=1.67x10^-27 kg (a) What is the vibrational frequency of this molecule? (b) What are the energy and the wavelength of the emitted photon when the molecule makes transition between its third and second excited states?
The vibrational frequency of this molecule is 8.23×10¹⁴.
The energy of the emitted photon is 0.542eV.
The wavelength is 2290 nm.
The vibrational angular frequency:
W= √k/m = 8.23×10¹⁴
B) Energy difference= hw
∆E = 0.542eV
C) Wavelength = 1240/0.542 = 2290 nm
What is Wavelength?
Wavelength is equally commensurable to frequence, which refers to the number of surge cycles per second. The advanced the frequency of the signal, the shorter the wavelength. A sound surge is a disturbance pattern caused by the movement of energy through a medium, similar as air, water, or any other liquid or solid, as it propagates down from the sound source. A water surge is an illustration of a surge that involves a combination of longitudinal and transverse stir. An electromagnetic surge is created as a result of climate between an electric field and a glamorous field.To know more about Wavelength, click the link given below:
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One mole of carbon has a mass of 12 grams. One mole of sulfur has a mass of 32 grams. Why does one mole of each element not have the same mass?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, one mole of each element not have the same mass as mole is directly proportional to the given mass.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
For carbon For sulfur
number of moles of carbon= 1 number of moles of sulfur=1
mass of 1 mole of carbon=12g mass of 1 mole of sulfur=32 gram
From calculation
Molar mass of carbon=12g/mol Molar mass of sulfur=32g/mol
Therefore, one mole of each element not have the same mass as mole is directly proportional to the given mass.
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