What mass of reactants are used
during the reaction?
Iron + Sulfur➜ Iron Sulfide
27.50 g
? g
Give your answer to the correct number of
significant figures.
(g) Iron + Sulfur
Answers
Answer:
27.50 g
Explanation:
Unless weight was somehow gained/lost during the reaction, the products should weigh as much as the reactants. Since this isn't specified the mass of the reactants should be equal to the mass of the products.
Related Questions
A sealable bag holds 3.79 L of
gas. How many moles of H₂
gas are needed to fill the bag
at 1.0 atm and 293 K?
Answers
The H₂ gas are needed 0.157moles to fill the bag .
For solving this problem we use the ideal gas equation. It is also called the general gas equation . This equation use for a hypothetical ideal gas. . It has several limitations. It was first stated by Benoit Paul Emile Clapeyron in 1834 . The ideal gas law is written by an empirical form:
PV = n R T
where-
P = Pressure
V = volume
T = Temperature
n = The amount of substance
R = Ideal gas constant
Now we have the values of these terms as-
P = 1 atm , V = 3.79L , T = 293K
and R = 0.0826 L/atm
For getting moles of hydrogen we can use the values of variables in ideal gas equation as -
P V = n R T
Now (1 atm) × ( 3.79L ) = n × ( 0.0826 L/atm) × ( 293K)
n = (1 × 3.79) ÷ (0.0826 x 293)
= 0.157 moles
So that the 0.157moles of H₂ gas are needed for fill the bag .
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The AP Biology teacher is measuring out 638.0 g of dextrose (C6H12O6) for a lab. How many moles of dextrose is this equivalent to?
Answers
The AP Biology teacher is measuring out 638.0 g of dextrose (C6H12O6) for a lab the moles of dextrose is this equivalent to is 3.6888 moles.
What are moles?A mole is described as 6.02214076 × 1023 of a few chemical unit, be it atoms, molecules, ions, or others. The mole is a handy unit to apply due to the tremendous variety of atoms, molecules, or others in any substance.
To calculate molar equivalents for every reagent, divide the moles of that reagent through the moles of the restricting reagent. The calculation is follows:
655/12 x 6 + 12+ 16 x 6 = 655/ 180 = 3.6888 moles.Read more about moles:
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Eric pours some iced tea into a glass. When he puts the iced tea in the glass, the energy of the glass decreases. What must be true of the energy of the iced tea?
Answers
Iced tea's energy increases while the energy of the glass decreases.
What is energy?Energy is the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other forms
Iced tea's energy increases while the energy of the glass decreases because the ice is getting warmer so the glass is also getting warmer. meaning that the glass is decreasing in energy while the ice tea is increasing in energy.
Hence, iced tea's energy increases while the energy of the glass decreases.
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Which of the following is a ketone?
Answers
Answer:
b
Explanation:
b is the ketone because it is and that's a fact
Answer:
D
Explanation:
Ketones are a class of organic compounds that have an Oxygen double bonded to the middle of the main carbon chain.
Option A is not a ketone (despite having an Oxygen double bonded to the middle of the main carbon chain) because it has an adjacent single bonded Oxygen in the main carbon chain. This type of compound is classified as an "Ester".
Option B is not a ketone, but is instead classified as an aldehyde, a group of compounds with their Oxygen double bonded at the end of the main carbon chain.
Option C is not a ketone (despite having an Oxygen double bonded to the middle of the main carbon chain), but is instead classified as an Carboxylic Acid, because it has an adjacent single bonded Oxygen in the main carbon chain, and both of these pieces (with the single bonded O pointing outward) are at the end of the main carbon chain.
Option D is a ketone because it does have an Oxygen double bonded somewhere to the middle of main carbon chain, not at an end, and not with another Oxygen single bonded adjacently in the carbon chain. Specifically, this ketone is "2-pentanone" or "methyl propyl ketone"
How does nuclear fission occur?
A) Protons gather in the nucleus of Uranium atoms and cause the nucleus to explode and release energy in the form of heat.
B) Neutrons smash into the nucleus of Uranium atoms. The neutrons are then split in half and release the energy in the form of heat .
Answers
Since it is the nucleus that splits and not the the neutrons
G identify which substitution product is expected to be favored. explain. the product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile. the inverted product is expected to predominate slightly, due to sn2 competition. the inverted product is expected to predominate slightly, as a result of ion pairs. the product with retention of configuration is expected to predominate slightly, because the leaving group attracts the nucleophile.
Answers
The substitution product that is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.
What is a substitution product?A substitution product is a product that is gotten from a reaction in which a group of reactants is replaced by another group in the reaction.
Therefore, the substitution product is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.
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What is the answer to this question? I need help!!
Answers
Answer:
[tex]\fbox {C}[/tex]
Explanation:
By repeating the experiment with new amounts of each reactant, this conflict can be resolved as we can see the effect of a reactant on the final amount of product formed.
Convert a speed of 88 m/s to its equivalent in cm/s.
pls help i don’t get it.
Answers
Answer:
8800 cm / s
Explanation:
There are 100 cm / m
so: 88 m/s * 100 cm / m = 8800 cm/s
( see how the 'm' cancels out and you are left with cm /s ?)
There are two common oxides of copper; one is 80% copper and the other is 89% copper by weight. Calculate the formula and name each compound.
Answers
Cupric oxide (CuO) and cuprous oxide (Cu2O) are the names of two oxides of copper.
Why both Cupric oxide (CuO) and cuprous oxide differ from one another?Both Cupric oxide (CuO) and cuprous oxide are different from one another because of the presence of number of copper atom. In one compound, copper is bonded with oxygen in 1:1 form whereas in the other compound, the copper is bonded with 2:1 form.
So we can conclude that Cupric oxide (CuO) and cuprous oxide (Cu2O) are the names of two oxides of copper.
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All of the following are anthropogenic greenhouse gases except Group of answer choices a. carbon dioxide. b. molecular oxygen. c. chlorofluorocarbons (CFCs). d. methane.
Answers
Answer:
c
Explanation:
its not a plant based gas
Which of the following compounds would make a good electrolyte?
Select one:
O a. ethanol
O b. carbon dioxide
O c. sodium chloride
O d. water
Answers
Answer:
C. Sodium Chloride.
Explanation:
Because when NaCl dissolved in water, it will dissociate to produce 2 ions Na+ and Cl-.
How many sublevels inn the second energy level?
Answers
There are two subshells that are s and p, which are present in the second energy level.
The energy level can be defined as the fixed distances from the nucleus of an atom where electrons may be found. Each energy level is divided into some Subshells. These subshells are known as s-subshell, p-subshell, d-subshell, and f-subshell. This subshell contains some orbitals, these orbitals are the place where there is the maximum probability of getting the electrons. In one orbital, a maximum of two electrons can be present.
Hence, there are two subshells in the second energy level.
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A 126.1-gram block of granite at 92.6°c is dropped into a tub of water at 24.7°c in an isolated system. the final temperature of both the granite and the water is 51.9°c. the specific heat capacity of granite is 0.795 joules/gram degree celsius, and the specific heat capacity of water is 4.186 joules/gram degree celsius. the granite block transferred of energy, and the mass of the water is .
Answers
The granite block transferred 4,080 joules of energy, and the mass of the water is 35.8 grams.
How we calculate heat transfer of any system ?Heat transfer in any system can be calculated as follow:
q = mCΔT
Given ;
m = mass of granite = 126.1 g C = specific heat of granite = 0.795 joules/gram degree CelsiusΔT = change in temperature of granite = 51.9 °C - 92.6 °C = -40.7 °CPutting all the values in folowing equation,
q = mCΔT
we get
q = 126.1 × 0.795 × -40.7 = -4080 J
Now by using same formula, we can also calculate the mass of water in the following way:
m = q / CΔT
where
C = specific heat of water = 4.186 joules/gram degree Celsius ΔT = change in temperature of water = 51.9 °C – 24.7 °C = 27.2 °CPutting all these values ;
m = -4080 / 4.186 × 27.2 = 35.8 g.
Hence, 4,080 joules of energy is transferred by granite block and 35.8 g is the mass of water.
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why can't amylase digest other substances?
Answers
Explanation:
saliva contains and amylase which randomly hydrogen all the one is equal to 4 glycosidic bonds of stars except it's out most bones and those next the branches on the hand glycogen being a highly branched molecule it is evident that amylase won't be a good animal eyes to digest it due to physical structure constance
What is the volume of a
0.40 M Nal solution that contains
0.20 moles Nal in it?
Answers
Answer:
500ml or 0.5l
Explanation:
The concentration is 0.40 M so there are 0.40 moles in 1 l of the solution.
0.40 moles -> 1 l
but we have to go to 0.20 moles, 0.40/2 = 0.20 moles but we have to divide the volume also by 2 that makes 0.5 liters.
Answer: 0.5
Explanation:
The concentration is 0.40 M so there are 0.40 moles in 1 l of the solution.
0.40 moles -> 1 l
but we have to go to 0.20 moles, 0.40/2 = 0.20 moles but we have to divide the volume also by 2 that makes 0.5 liters.
Lead (II) acetate reacts with sodium hydroxide to produce lead (II) hydroxide and sodiumacetate. Please write the chemical equation and *don't* balance the sides!
Answers
The chemical equation is:
Pb(CH₃COO₎₂ + NaOH ---> Pb(OH)₂ + CH₃COONaWhat is a chemical equation of a reaction?A chemical equation of a reaction is an equation which shows the reactants and products of a reaction using their chemical formulae.
The chemical equation when Lead (II) acetate reacts with sodium hydroxide to produce lead (II) hydroxide and sodium acetate is given below:
Pb(CH₃COO₎₂ + NaOH ---> Pb(OH)₂ + CH₃COONa
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The theoretical yield of NaBr from
2.36 mol FeBr3 is 7.08 mol NaBr.
What is the percent yield if 6.14 mol
NaBr were collected?
[?]%
Answers
Taking into account definition of percent yield, the percent yield for the reaction is 100%.
Reaction stoichiometryIn first place, the balanced reaction is:
2 FeBr₃ + 3 Na₂S → Fе₂S₃ + 6 NaBr
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
FeBr₃: 2 moles Na₂S; 3 molesFе₂S₃: 1 mole NaBr: 6 molesMoles of NaBr formedThe following rule of three can be applied: if by reaction stoichiometry 2 moles of FeBr₃ form 6 moles of NaBr, 2.36 moles of FeBr₃ form how many moles of NaBr?
[tex]moles of NaBr=\frac{2.36 moles of FeBr_{3}x6 moles of NaBr }{2 moles of FeBr_{3}}[/tex]
moles of NaBr= 7.08 moles
Then, 7.08 moles of NaBr can be produced from 2.36 moles of FeBr₃.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
[tex]percent yield=\frac{actual yield}{theorical yield}x100[/tex]
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this caseIn this case, being the molar mass of NaBr 102.9 g/mole, you know:
actual yield= 7.08 moles× 102.9 g/mole= 728.532 gramstheorical yield= 7.08 moles× 102.9 g/mole= 728.532 gramsReplacing in the definition of percent yields:
[tex]percent yield=\frac{728.532 grams}{728.532 grams}x100[/tex]
Solving:
percent yield= 100%
Finally, the percent yield for the reaction is 100%.
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Answer: 87%
Explanation:
several balls and sticks glued together to represent a molecule
Answers
Answer:
The different elements are represented by their symbols one line shows a single bond and two lines show a double bond. This written representation is called a structural diagram
if earth has an oxidizing environment, what would you expect to happen to if left to sit over time?
Answers
If the earth is completely an oxidizing atmosphere, materials would ignite spontaneously when they are exposed to air.
What would happen if the earth is an oxidizing environment?Let us recall that oxidation has to do with an increase in oxidation number. If the earth is left as an oxidizing atmosphere without any attenuation, we can not have pure substances.
Secondly, materials would ignite spontaneously when they are exposed to the oxidizing atmosphere of the earth.
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I need the answer asap
Answers
Answer:
The energy will be added
Explanation:
what has the highest volume 1kg lead, 1kg of iron, 1kg of gold, or 1kg of copper
Answers
Answer:
1kg gold because when it's mined it needs stronger machines
1kg gold because when it's mined it needs stronger machines.
What is volume?The amount of space occupied by a three-dimensional figure as measured in cubic units.
Gold is called a heavy metal because of its high density, which comes from the fact that each of its atoms is individually very heavy.
Hence, 1kg gold because when it's mined it needs stronger machines.
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Figure 2 shows what happens to the electrons in the outer shells when a sodium atom reacts with a fluorine atom.
The dots (•) and crosses (x) represent electrons.
Describe, as fully as you can, what happens when sodium reacts with
fluorine to produce sodium fluoride.
Answers
Sodium reacts with fluorine to make a covalent bond between them. A covalent bond is formed when there is a mutual sharing of electrons between the two adjacent atoms.
Here, Sodium is metal and fluorine is non-metal. So, the bond between them may be an ionic bond, but as the Sodium has one valence electron and fluorine is highly electronegative. Sodium wants to lose electrons and fluorine wants to gain electrons to form a chemical bond. Therefore, the sodium donates its valence electron to fluorine, forms a cation, and fluorine accepts the electron and forms an anion and they distribute the difference in the charge between them.
So, we can say that when sodium and fluorine react to form sodium fluoride with a covalent bond.
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What is the source of energy in nuclear power plants?
Answers
Answer:
URANIUMExplanation:
What is the source of energy in nuclear power plants?
Uranium is the fuel most widely used by nuclear plants for nuclear fission. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart.
Explain how you know it must be oxygen. Where
did the oxygen come from?
Intro
Previous Activity
I
000
O Tutoring Help
Answers
Answer:
oxygen is a present in our atmosphere and mixed with other gases on the surrounding screen plants are also measure source of getting oxygen they take carbon dioxide from making their food by for the cities and give away oxygen in return
Explanation:
most of the earth oxygen comes from tiny Ocean plants are called phytoplaston
Warning signs are sometimes placed on aerosol cans to prevent people from throwing them into a fire. What is true about the gas in the aerosol can after it is placed in a fire? Check all that apply.
Answers
Answer:
If the gas in the aerosol is placed in a fire then the volume will remain constant.
Explanation:
Avogadro's Law provides the formula needed to determine the relationship between the gas amount and volume present in a container.
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The table describes solids and plasmas.
-
Which statement can be placed in the blank cell to make the information in the table accurate?
can be crystalline
can be amorphous
are made of charged particles
are made of neutral particles
Answers
The statement that can be placed in the blank cell to make the information in the table accurate is Plasma : (D). are made of neutral particles
Meaning of plasmaPlasma can be defined as a form of matter, though its not as common as the three major forms of matter.
Plasma displays more of the features of a gas but it is not a gas. it has more density than a gas and is less dense than liquid and solid
In conclusion, The statement that can be placed in the blank cell to make the information in the table accurate is Plasma : (D). are made of neutral particles
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Answer:
Answer is (D) or fourth option
Explanation:
Plasmas are made of neutral particles
According to the concept of entropy, what will likely happen to most molecules over time?.
Answers
They're going to fall apart.
What most molecules will likely experience over time?A system's entropy cannot decrease unless heat is being lost from it. This indicates that entropy cannot decrease in a closed system (i.e., nothing enters or leaves, and that means nothing at all), so it must either remain constant or rise. Entropy can decrease, rise, or stay constant in an open system when movement between the system and its surroundings is conceivable. Both of these outcomes leave open the option of a constant state.
Entropy:-
The quantity of atom-alignment combinations that can exist in a system is known as entropy. The quantity of energy that cannot be used for work can also be calculated from an object's entropy.
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Use the following scenario to calculate the carbon flux in the atmosphere. The amount of carbon that enters the atmosphere through natural processes is 211.6 GtC/yr and the amount that leaves the atmosphere through natural processes in 213.8 GtC/yr. The amount of carbon released by burning fossil fuels is 5.5 GtC/yr. What is the carbon flux in the atmosphere
Answers
The amount of carbon flux in the atmosphere will be 3.3 GtC/yr
Carbon flux calculationThe carbon flux in the atmosphere can be calculated by:
1. Removing the amount of carbon that leaves the atmosphere from the amount that enters the atmosphere.
2. Adding the amount of carbon released by fossil fuel burning.
Thus,
Carbon flux = 211.6 - 213.8 + 5.5 = 3.3 GtC/yr
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what is the percent yield of sulfur dioxide if the burning of 25.0 g of carbon disulfide produces 40.5 g of sulfur dioxide?
Answers
Answer:
25-54-46-36 619-73 77-88-50
(a) write the net acid-base reaction that occurs when hi is added to water. (use the lowest possible coefficients. omit states-of-matter in your answer.)
Answers
The net acid-base reaction that occurs when HI is added to water is HI(aq) + H2O(l) ⇄ H3O^+(aq) + I^-(aq).
What is an acid base reaction?A acid base reaction involves the transfer of a proton in the Bronsted- Lowry sense. In this case, the acid is the lone pair donor while the base is the lone pair acceptor.
Thus;
HI(aq) + H2O(l) ⇄ H3O^+(aq) + I^-(aq). This the net acid-base reaction that occurs when HI is added to water.
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The net acid-base reaction that takes place when HI is added to water is HI(aq) + H2O(l) ⇄ H3O^+(aq) + I^-(aq).
What is an acid-base reaction?
An acid-base reaction involves the shift of a proton in the Bronsted Lowry sense. The acid is the lone pair giver while the base is the lone pair acceptor(takes the lone pair). The acid and base reaction will rely upon the strength of the acid and base. This eventually means if the reaction is between a strong acid and a weak base then its result will differ from the reaction between a strong acid and a strong base or a weak acid and a weak base.
Therefore; HI(aq) + H2O(l) ⇄ H3O^+(aq) + I^-(aq).
The above-mentioned equation is the net acid-base reaction that occurs when HI is added to water.
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