The law of conservation of mass is always followed in a balanced chemical equation. This law states that the mass of the products and the mass of the reactants must be equal.
How does the law of conservation apply?
Physical and chemical changes can cause matter to transform into different forms, but no matter what happens, matter is always conserved. There is no creation or destruction of matter; the amount of matter is the same before and after the transformation. The Law of Conservation of Mass is the name given to this idea.
Because each chemical equation must be balanced and the number of atoms of each element on the reactant side must equal the number of atoms of each element on the product side, chemical equations serve as examples of the law of conservation of mass.
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Mno2(s) + 4hcl(aq) → mncl2(aq) + cl2(g) + h2o how many grams of hcl are required to produce 11.2g cl2 ?
28.0 grams of HCl are required to produce 459.5 g grams of Cl2.
To find out how many grams of HCl are required to produce 11.2 grams of Cl2, we need to use the balanced equation for the reaction between MNO2, HCl, MnCl2, and Cl2.
MNO2(s) + 4HCl(aq) → MnCl2(aq) + Cl2(g) + H2O
From the balanced equation, we can see that 1 mole of MNO2 reacts with 4 moles of HCl to produce 1 mole of Cl2.
To convert the mass of Cl2 to moles, we use the molar mass of Cl2, which is 35.5 g/mol:
11.2 g Cl2 / 35.5 g/mol = 0.316 mol Cl2
Since the reaction requires 4 moles of HCl for every 1 mole of Cl2, we can use the ratio between moles of HCl and moles of Cl2 to find the number of moles of HCl:
4 moles HCl / 1 mole Cl2 = 4 moles HCl/ 0.316 moles Cl2 = 12.6 moles HCl
To convert moles to grams, we use the molar mass of HCl, which is 36.46 g/mol:
12.6 moles HCl x 36.46 g/mol = 459.5 g HCl
Therefore, 28.0 grams of HCl are required to produce 11.2 grams of Cl2.
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Which event is occurring because of increasing carbon dioxide levels in the atmosphere?.
The atmosphere's rising carbon dioxide concentrations are causing an increase in the greenhouse effect.
The greenhouse effect is a result of the interaction between the sun's energy and the greenhouse gases found in the Earth's atmosphere, such as methane, carbon dioxide, nitrous oxide, and fluorinated gases. The greenhouse effect causes a rise in global temperatures.Gases in the atmosphere, such as carbon dioxide, trap heat in a similar way to a greenhouse's glass roof.During the day, the Sun radiates through the atmosphere. The Earth's surface warms in the sunlight. At night, as the Earth's surface cools, heat is transferred back to the atmosphere. However, a portion of the heat is trapped by greenhouse gases in the atmosphere.To learn more about greenhouse effect from given link
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identify two ways to increase the current in a simple circuit
The two primary methods for increasing current in an electrical circuit are to increase the voltage or to decrease the resistance.
What are the factors affecting current?The flow of electricity in an electronic circuit, as well as the amount of electricity flowing through a circuit, are referred to as electric current. It is expressed in amperes. The greater the value in amperes, the more electricity flows through the circuit.A circuit's current is proportional to the electric potential difference impressed across its ends and inversely proportional to the total resistance provided by the external circuit. The higher the battery voltage(v), the higher the current.The electrical current (I) flowing in a circuit is proportional to the voltage and inversely proportional to the resistance, according to Ohm's law. As a result, increasing the voltage causes an increase in current as long as the resistance(R) of the circuit remains constant.To learn more about current refer to :
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B. Identify the type of molecule from the name of the molecule. (2 point) Name of Molecule Type of Molecule Hexanol Iobutyl acetate Octanal Propanoic acid Benzophenone Dimethyl ether Chlorpheniramine
Answer: Hexanol -> Alcohol, Isobutyl acetate -> Ester, Octanol -> Alcohol, Propanoic acid -> Carboxylic Acid, Benzophenone -> Ketone, Dimethyl ether -> Ether, Chlorpheniramine -> N-Base.
What are functional groups?
A functional group in organic chemistry is a collection of atoms in a molecule that binds together to react predictably. Examples of functional groups include hydroxyl, ketone, amine and ether groups.
Hexanol -> Alcohol Isobutyl acetate -> EsterOctanol -> Alcohol Propanoic acid -> Carboxylic AcidBenzophenone -> KetoneDimethyl ether -> EtherChlorpheniramine -> N-BaseTherefore, the above are the types of the molecules derived from the name of the molecule.
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1. Determine the concentration of a solution made by dissolving 1.0 moles of potassium flouride (KF) to make .10 L of total solution.
2. 28g (grams) of NH3 is dissolved in 500 mL of water. What is the concentration (in M) of the resulting solution?
3. Claude wants to make 2L of 0.5 solution of AgCl. How many grams of solution does he need?
1.0 mole of Potassium fluoride is mixed to get 0.10 L of solution is 10 M and 17.85 mole / L is the concentration of resulting solution of NH₃
Evaluating :Molarity = mol solute / L solution
= 1.0 mol/0.10 L
= 10 mol/L
= 10 M.
2 .28g (grams) of NH3 is dissolved in 500 mL of water. result of concentrating solution :
Molarity, M= number of moles/ volume of solution
M= n/ V
Number of moles, n= mass /molar mass
Molar mass of NaOH=500L/mole
Mass=28g
n= 500/28
= 17.85 mole/ L
3. Claude wants to make 2L of 0.5 solution of AgCl , grams needed for solution :
0.5 mole/ 2 liter x 180 grams/mole x 2 liter
= 180 g
How does potassium fluoride work?KF is the chemical formula for the compound potassium fluoride. KF is the most widely used source of fluoride ions in chemical and manufacturing processes, surpassing hydrogen fluoride. Carobbiite, a rare mineral, is where you can naturally find potassium fluoride, an alkali halide. Potassium fluoride is a white, crystalline, salty-tasting powder. It looks like sand. utilized as an insecticide, preserver, and etchant for glass.
KF is the chemical formula for the compound potassium fluoride.KF is the primary source of fluoride ions, following hydrogen fluoride.Potassium fluoride is the most widely used source of fluoride ions in chemical and manufacturing processes after hydrogen fluoride.Learn more about potassium fluoride :
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Please help me!!!!!!!
You can apply the straightforward formula to determine the average atomic mass.
How can I determine the average atomic mass of isotopes?You can apply the straightforward formula to determine the average atomic mass.AM = f1 m1 + f2 m2 +... + fn mn.AM stands for average atomic mass, fn for natural abundance of isotope number n, and mn for isotope number n's atomic mass.Add the atomic masses of each isotope to the natural abundance.Add up all the items you got in step one.The resulting value is the element's average atomic mass.The existence of isotopes for elements can be explained by their average atomic mass. It provides us with the average atomic masses of all the element's isotopes.It is advantageous since its value is equal to the molar mass of an element. Additionally, being aware of the tooth.To learn more about average atomic mass refer to:
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What is the goal of captive breeding programs?
A to increase the population size of a species
B to restore the animal kingdom
C to restore germ cells or genes
D to restore the population of a species
Answer:
D. To restore the population of a species
Explanation:
Captive-breeding programs breed endangered species in zoos and other facilities to build a healthy population of the animals. Species-survival plans coordinate with zoos around the world to bring species together for breeding that ensures genetic diversity.
How many molecules are in 3 moles of H2O?.
There are 18.066 x 10^23 molecules of H2O.
1 mole of a substance is defined as the amount of that substance that contains Avogadro's number of entities, which is 6.022 x 10^23. This number is also known as Avogadro's constant.
It is important to note that Avogadro's constant is specific to the number of entities (atoms, molecules, ions, etc.) and not the mass or volume of a substance.
In the case of H2O (water), each molecule of water is made up of 2 hydrogen atoms and 1 oxygen atom. Therefore, 1 mole of H2O contains 6.022 x 10^23 molecules of H2O, each containing 2 hydrogen atoms and 1 oxygen atom.
So, when we have 3 moles of H2O, we have 3 x 6.022 x 10^23 = 18.066 x 10^23 entities of H2O. As each molecule of H2O contains 2 hydrogen atoms and 1 oxygen atom, this means that we have 18.066 x 10^23 molecules of H2O.
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There is 368g of Rb2S, how many moles are there?
To find the number of moles of a substance, you need to divide the mass of the substance by its molar mass.
The molar mass of Rb2S is (2x85.468 + 32.06) g/mol = 212.996 g/mol
So, to find the number of moles of Rb2S in 368g, you would divide 368g by 212.996 g/mol :
moles = 368 g / 212.996 g/mol = 1.73 moles
There are 1.73 moles of Rb2S in 368g.
How many chlorine atoms does 7.30 g sample of iron (II) chloride contain? MM FeCl2= 126.8 g/mol
To determine how many chlorine atoms are present in a 7.30 g sample of iron(II) chloride (FeCl2), you can use the molar mass of FeCl2 and the given mass of the sample.
First, you need to convert the mass of the sample from grams to moles using the molar mass of FeCl2:
mass (g) / molar mass (g/mol) = moles
7.30 g / 126.8 g/mol = 0.0578 moles
Iron(II) chloride is composed of one atom of Iron and two atoms of chlorine, so for every 1 mole of FeCl2, there are 2 moles of chlorine atoms.
To find the number of chlorine atoms in the sample, we need to multiply the number of moles of FeCl2 by the number of chlorine atoms per mole:
moles of FeCl2 x (number of chlorine atoms / 1 mole of FeCl2) = moles of chlorine atoms
0.0578 moles x 2 = 0.1156 moles
To convert moles of chlorine atoms to the number of atoms, we need to multiply by Avogadro's number which is 6.022 x 10^23 atoms/mol
0.1156 moles x 6.022 x 10^23 atoms/mol = 6.93 x 10^22 atoms of chlorine.
So 7.30 g sample of iron (II) chloride contains 6.93 x 10^22 atoms of chlorine.
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Particle derives its name from the fact that it has no electrical charge; it is neutral and found in the nucleus of an atom called
The word particle comes from the fact that a neutron, which is what is found in the nucleus of an atom, has no electrical charge and is therefore electrically neutral.
Describe neutrons.
The term "particle" refers to a neutron, which makes up the atom's nucleus and is electrically neutral because it has no electrical charge.Neutrons are one of the three main subatomic particles found in atoms, which have a negative charge, along with protons and electrons.They prevent the protons in the atom's nucleus from repelling one another, which would otherwise happen, due to their positive charge.Additionally, neutrons play a role in defining an atom's structure and some types of radioactive decay.To learn more about neutrons refer to:
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classify the compounds according to whether they are conjugated or non‑conjugated.
Conjugated dienes are two double bonds separated by a single bond. Nonconjugated Dienes are two double bonds are separated by more than one single bond.
In general , p-orbitals were used to identify conjugation. These p-orbitals are significantly used to make double bonds, so a lone pair is present in p-orbitals if it is conjugate . Hence, To be a conjugated atom it must have three or more p-orbitals in a row.
If we talk about Conjugated system, the covalent chemical compound, a group or chain of atoms that carries valence electrons and they are not engaged in single-bond formation so they modify the behavior's of each other atoms present in the vicinity .
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What is the vapor pressure of a solution made from 23.5 g of glycerin in 130 g of methanol at 50 °c? the vapor pressure of pure methanol at 50 °c is 400 torr. report your answer in torr and round to the first decimal place?
The vapor pressure of the solution can be calculated using the expression of Clausius-Clapeyron equation. Putting the value of 23.5g of glycerin in 130g of methanol in the equation we get the result.
The vapor pressure can be defined as the force that an evaporating substance exerts against the walls of a sealed container.
ln (P1/P2) = (ΔHvap. /R) (1/T2 - 1/T1)
Here where P1 and P2 are the vapor pressures at two temperatures T and T2 . Clausius - Clapeyron equation allows to estimate the vapor pressure at another temperature if the vapor pressure is known at some temperature and if the enthalpy of vaporization is known. The partial vapor pressure of a component in a mixture is equal to the vapor pressure of the component at that temperature multiplied by the component's mole fraction.
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fill in the words to complete each step in liquid spill cleanup.
1. Surround the area with absorbent material, then cover the spill.
2. Scoop up the material and place in a plastic bag.
3. Place the bagged waste in a solid waste container.
4. Wipe down the area with detergent and water
Each blank is filled with the correct word from the given options as follows: 1: Surround the area with B: absorbent material, then cover the spill; 2: Scoop up the material and place in a A: plastic bag; 3: Place the bagged waste in a D: solid waste container; and 4: Wipe down the area with C: detergent and water.
A spill in the workplace can yield a variety of hazards and risks to workers so, in essence, it is essential that they understand how to clean up liquid spills that otherwise can be hazardous. So, such materials are needed to be appropriate disposed of. Following steps can be followed to clean up liquid spills properly:
1: Surrounding the area with absorbent material, then covering the spill;
2: Scooping up the material and placing in a plastic bag;
3: Putting the bagged waste in a solid waste container;
4: Wiping down the area with detergent and water
"
Complete question is as follows:
Fill in the words to complete each step in liquid spill cleanup.
options:
A: plastic bag...
B: absorbent material...
C: detergent and water...
D: solid waste container...
1. Surround the area with _________, then cover the spill.
2. Scoop up the material and place in a ________
3. Place the bagged waste in a _________
4. Wipe down the area with _________
"
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If you have a ound wave moving at 340 m/ and a frequency of 100 what i the wavelength
If you have sound wave moving at 340 m/s and a frequency of 100 Hz , the wavelength is 3.4 m.
Given that :
The velocity of the sound wave = 340 m/s
The frequency = 100 Hz
The wavelength expression is given as :
Wavelength = velocity / frequency
where,
velocity = 340 m/s
frequency = 100 Hz
Wavelength = 340 / 100
Wavelength = 3.4 m
Thus, the wavelength is 3.4 m if the sound wave velocity is 340 m/s and the velocity is 100 Hz. The wavelength is the distance between crests in the adjacent cycles of the waveform.
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The thin‑layer chromatography (TLC) plate shown was developed with 20% ethyl acetate in hexanes. (4)Suppose the plate had instead been developed with 5% ethyl acetate in hexanes. Determine whether each plate is a possible result of the adjusted development process
In thin‑layer chromatography (TLC) plate 1: possible
middle: dot on top
dot w/circle on bottom
rest: impossible
Non-volatile mixtures can be separated using the chromatography technique known as thin-layer chromatography (TLC). A sheet of an inert substrate, such as glass, plastic, or aluminum foil, is used for thin-layer chromatography. This substrate is covered with a thin layer of an adsorbent material, often silica gel, aluminum oxide (alumina), or cellulose. In the TLC process, a solvent or combination of solvents serves as the mobile phase. You've come to the correct site if you want to learn more about the thin layer chromatography process. Here, we'll talk about its basic idea, how it works, and how it may be used in many fields of business.A line is often drawn 0.5–1.0 cm from the bottom of a thin layer chromatography plate, which is typically 5-7 cm high. You will place your mixes along that line for separation.
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what happens to the co2 that is produced in the reaction?
Carbon dioxide reacts with water in a reversible reaction to form carbonic acid (H2CO3).
What is meant by Carbon dioxide ?
Carbon dioxide is used as a refrigerant, in fire extinguishers, to blow coal, foam rubber and plastics, inflate life rafts and life jackets, blast coal, promote plant growth in greenhouses, immobilize animals before slaughter, and in carbonated drinks.When animals breathe or decay (decompose), carbonate rocks are worn, forest fires happen, and volcanoes erupt, carbon dioxide is naturally released into the atmosphere.Human activities such as the combustion of fossil fuels, the destruction of forests, and the manufacture of cement all contribute to the atmospheric addition of carbon dioxide.Two oxygen atoms and one carbon atom make up the chemical structure of the gas known as carbon dioxide (CO2).Its capacity to absorb infrared waves makes it a significant greenhouse gas.To learn more Carbon dioxide about refer to
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Rutherford created a planetary model for atoms after his experiments. Imagine if Rutherford’s idea that electrons radiate energy while orbiting around the nucleus was true which other model or scientific idea would have been strengthened by this?
If Rutherford's idea that electrons radiate energy while orbiting around the nucleus was true, it would have strengthened the idea of the Bohr model of the atom, which also proposed that electrons occupy specific energy levels or orbitals around the nucleus.
What is the basis of Rutherford's experiment?This model was developed by Niels Bohr in 1913 and was based on the idea that electrons move in quantized orbits around the nucleus, similar to how planets orbit the sun.
The Bohr model was able to explain the observed spectral lines of hydrogen and was able to predict the energy levels of other atoms. Thus, the Rutherford's planetary model and the Bohr model would have been consistent with each other.
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How do you find the velocity of a ball?.
The velocity of the ball is calculated by the formula v = Δs/Δt.
that is [tex]\overline{v}={\frac{\Delta x}{\Delta t}}[/tex]
Velocity is the direction at which an object is moving and serves as a measure of the rate at which its position is changing as seen from a specific point of view and as measured by a specific unit of time (for example, 60 km/h northbound). In kinematics, the area of classical mechanics that deals with the motion of bodies, velocity is a fundamental idea.
A physical vector quantity called velocity must have both a magnitude and a direction in order to be defined. Speed is the scalar absolute value (magnitude) of velocity; it is a coherent derived unit whose quantity is measured in metres per second (m/s or m/s1) in the SI (metric system). In contrast to "5 metres per second east," which is a vector, "5 metres per second," for instance, is a scalar.
By dividing the distance by the time, the ball's speed is determined. The average speed will be 60/3, or 20 feet per second (6.1 metres per second), if the time was 3 seconds.
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what type of chemical bond forms between two atoms bearing opposite charges?
The type of bond formed between two atoms having opposite charges is an ionic bond.
There are mainly two types of bonds formed between two atoms depending upon the way in which the combining atoms attain an octet structure in their valence shell.
First is, Ionic bonds. These are formed by the transfer of one or more valence shell electrons from a metal atom to the valence shell of a non-metal atom both containing opposite charges. Ionic compounds exist as ions also.
Next is Covalent bonds. These bonds are formed by the mutual sharing of electrons between the two combining atoms and they contribute an equal number of electrons for sharing. Covalent compounds only exist as molecules.
Other than these there are other types of bonding as well.
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light amplification by stimulated emission of radiation
Light Amplification by Stimulated Emission of Radiation, or "LASER," is the abbreviation for this process. It applies to any apparatus that produces and amplifies a coherent, focused, narrow beam of light.
Amplification of light - what does that mean?Increasing the amplitude of an electromagnetic light wave is the process of light amplification. Three main categories—laser, parametric, and scattering—are commonly used to describe this process.Light Amplification by Stimulated Emission of Radiation, or "LASER," is the abbreviation for this process. It applies to any apparatus that produces and amplifi es a coherent, focused, narrow beam of light.The energy from an electrical current or light is absorbed by the electrons in the atoms of optical materials like glass, crystal, or gas, which results in the formation of a laser. The additional energy "excites" the electrons to the point that they change their orbits around the atom's nucleus from one with a lower energy to one with a higher energy.To learn more about Light Amplification refer to:
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Chem Reaction: B2H6 + 3O2 --> B2O3 + 3H2O
1. How many grams of liquid oxygen would a rocket have to carry to burn 50g of diborane (B2H6) completely?
According to the stoichiometry of the given chemical equation, 24,295 g of liquid oxygen would a rocket have to carry to burn 14 kilograms (14,000 g) of diborane completely.
What is stoichiometry?The measurement of element or compound amounts in a chemical process is known as stoichiometry. The laws of conservation of mass and merging weights and volumes serve as the foundation for the linked relationships.In quantitative analysis, stoichiometry is used to calculate the concentrations of various substances in the sample.
It helps make solutions with different concentrations that can be used in titrations and balance chemical equations. 48 g oxygen gives 27.66 g diborane thus, for 14000 g diborane 14000×48/27.66= 24,295 g oxygen is required.
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describe the temperature, moisture and air pressure associated with a continental polar air mass.
The variance in the US continental region is brought on by the shift in daytime and nighttime weather patterns.
Continental polar air mass -Cold, dry, and stable air masses are found in the continental polar (cP) or continental arctic (cA) regions. Radiative cooling causes these air masses to form over northern Canada and Alaska. They travel south, then east via the Plains and the Rockies.
During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south. Low humidity and temperature are both present.
These factors contributed to the polar air mass:
Breezeextreme humiditythe evening's low temperatureDuring the colder months of the year, continental polar air typically forms over vast land masses.
A cool breeze blows across the upper section of the area, while a warm breeze blows through the lower part.
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How do the atomic radius and metallic properties of sodium compare to the atomic radius and metallic properties of phosphorus?
Answer:
The atomic radius of sodium (Na) is larger than the atomic radius of phosphorus (P). This means that the atoms of sodium are larger in size than the atoms of phosphorus.
In terms of metallic properties, sodium is a metal while phosphorus is a nonmetal. Metals typically have a shiny appearance, high thermal and electrical conductivity, and are typically malleable and ductile. Nonmetals are typically dull, poor conductors of heat and electricity, and are typically not malleable or ductile.
Sodium is a highly reactive metal and is usually found in nature as a compound rather than a pure element. It has a low melting point and boiling point, and is a good conductor of heat and electricity. Phosphorus is a nonmetal that can exist in different allotropic forms, white phosphorus is highly reactive, and red phosphorus is less reactive. It has a low melting and boiling point and is a poor conductor of heat and electricity.
In summary, the atomic radius of sodium is larger than that of phosphorus and sodium is a metal while phosphorus is a nonmetal. Sodium has properties of high reactivity, low melting point and boiling point and good conductivity of heat and electricity while Phosphorus has properties of low reactivity, low melting and boiling point and poor conductivity of heat and electricity.
explain the process that creates chemical elements lighter than iron, including evidence
Nuclear fusion is the process that creates chemical elements lighter than iron. Helium is created when two hydrogen atoms join in a star at a speed that is almost as fast as light.
What is element?A material is considered an element if it cannot be divided into two or maybe more simpler compounds by any kind of chemical process, including the use of light or heat. For instance, when a piece of gold is melted, the gold element still melts and is there.
The lightest element is hydrogen. Helium is created when two hydrogen atoms join in a star at a speed that is almost as fast as light. The star keeps doing this until there are no more hydrogen atoms available. When this occurs, the star produces Beryllium by fusing the Helium atoms. When the helium runs out Carbon is created by combining Beryllium in the star. This procedure keeps going until the star produces iron. The star then explodes. Our dwellings and buildings are made out of all those atoms.
Therefore, nuclear fusion is the process that creates chemical elements lighter than iron.
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Which manufacturing process is shown in the photograph?
A. Combining
B. Forming
C. Separating
D. Conditioning
Answer:
looks like separating
Explanation:
cutting the fabric with scissors
Look at the graph of the same data. Between which minutes was the speed of the car fastest? What was its speed in meters per minute then? Between which minutes was the speed of the car slowest? What was its speed in meters per minute then?
if u can pls put an explanation bc my teacher is pretty strict about that
The minutes in which the car was fastest were 1 to 4 and the speed was 733 meters per second , and the minutes in which the car was the slowest were 4 to 5 and the speed was 100 meters per second.
How to identify the speed of the car?The speed can be calculated using a simple formula: distance /time. Moreover, in a graph, you can know whether the car is going fast or slow depending on the slope of the line.
When did the car go the fastest?From minute 1 to minute 4 as the distance covered was 2200, then 2200 / 3 = 733 meters per second.
When did the car go the slowest?From minute 4 to minute 5 as the distance was only 100 meters, then 100/1 = 100 meters per second
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what is the similarities of comets and asteroids
which nonmetal is the only one that is liquid at room temperature ?
O mercury
O oxygen
O bromine
O helium
Bromine is the only non metal that exists in liquid state at the room temperature.
Bromine belongs to the member of halogen group. Heavy, volatile, mobile etc are some of the characteristics of it. Bromine is quite dangerous.
It has red brown color at room temperature. It is very reactive as it evaporates quickly to form a similar colored gas.
Bromine molecules depicts strong inter-molecular force so that's why it doesn't evaporates at room temperature. It also shapes up diatomic molecules and Van Der Walls interactions are highly strong.
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Answer:
helium
Explanation:
When hydrogen sulfide gas is bubbled into a solution of sodium hydroxide, the reaction forms sodium sulfide and water.
How many grams of sodium sulfide are formed if 1.80 g of hydrogen sulfide is bubbled into a solution containing 2.40 g of sodium hydroxide, assuming that the sodium sulfide is made in 93.0 % yield?
The amount of sodium sulfide formed would be 2.18 grams..
Stoichiometric problemHydrogen sulfide and sodium hydroxide react according to the following equation:
[tex]2 NaOH (aq) + H_2S (g) -- > 2 H_2O (l) + Na_2S (aq)[/tex]
Mole equivalent of 1.80 g hydrogen sulfide = 1.80/34.1 = 0.05 mol
Mole equivalent of 2.40 g of sodium hydroxide = 2.40/40 = 0.06 mol
From the equation of the reaction, the mole ratio of sodium hydroxide to hydrogen sulfide is 2:1. This means that 0.06 mol sodium hydroxide is limiting while 0.05 mol hydrogen sulfide is in excess.
The mole ratio of sodium hydroxide to sodium sulfide is 2:1. Thus, the equivalent mole of sodium sulfide produced would be:
0.06/2 = 0.03 mol
Mass of 0.03 mol sodium sulfide = 0.03 x 78 = 2.34 grams
At 93.0% yield = 0.93 x 2.34
= 2.18 grams
In other words, the amount of sodium sulfide formed at 93.0% yield would be 2.18 grams.
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