How many moles of a gas are contained in 2.085 L at STP?
A. 0.0931 mol
B. 10.8 mol
C. 10.3 mol
D. 1.11 mol
Answers
A.0.0931 mol
from ideal gas equation ,
We have ,
PV = nRT
Where P stands where pressure of gas.
We know that pressure of gas at STP = 1 atm
V stands for volume of gas , given Volume is 2.085 L
R stands for gas constant , R = 0.0821
And T stands for absolute temperature and measured in kelvin,T=273K
Now ,
PV = nRT
n = PV/RT
Refer attachment for working
Related Questions
Compare the temperature change for cold sand and cold water when the same amount of hot water was added. what do you discover?
Answers
When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
What is specific heat capacity?Specific heat capacity is the quantity of heat required to raise a unit mass of a substance by 1 kelvin.
Specific heat capacity of water and sandWater, c = 4,200 J/kg⁰C
Sand, c = 830 J/kg⁰C
Q = mcΔθ
where;
Δθ is temperature changeQ is quantity of heat addedΔθ = Q/mc
Thus, for an equal mass of water and sand, when the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
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Answer:t
Explanation:
a student used a vernier magnetic field sensor to measure the strength of the magnetic field generated by a bar magnet. at which position is the
strength of the magnetic field strongest point a or point b?
Answers
The position is the strength of the magnetic field strongest is is the place where the magnetic field leaves, being point A.
What generates a magnetic field?When an electrically charged particle moves, it creates a magnetic field. According to the laws of electromagnetism, this magnetic field originates from the variation of the electric field strength.
In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense.
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1-3 gas stoichiometry! please help and put in steps in every problem. please help if u can
Answers
Answer:
um Im not sure what the heck that is
What is the volume of a sample of mercury, a liquid metal, if it has a density of 14 g/ml and a mass of 28 g?
Answers
Density of sample of mercury = 14g/mL
Mass of sample of mercury = 28 g
We know that ,
Density = mass/volume
Hence ,
Volume = mass of sample/density of sample
Volume of sample of mercury , V = 28g/14g/mL
Volume = 2mL
What is the pH of a solution that contains 0.0003 moles of KOH in 410 mL of solution?
Answers
Answer: 10.865
Explanation:
The molarity of the solution is [tex]\frac{0.0003}{0.410}=0.0007317073 \text{ M}[/tex].
So, the pOH is [tex]-\log(0.0007317073)=3.135[/tex]
Since pH + pOH = 14, the pH is 14-3.135, which is about 10.865
Based on table n, uranium-238 and uranium-235 have different
a)decay modes
b)half lives
c)number of protons
d)number of electrons
Answers
According to table N, the isotopes uranium-238 and uranium-235 have different half lives.
What are radioactive nuclides?Radioactive nuclides are those nuclides that are able to undergo radioactive decay. They have specific modes of decay that is peculiar to each isotope.
Hence, according to table N, the isotopes uranium-238 and uranium-235 have different half lives.
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Match the phase to the correct definition.
1.
Anaphase
2.
Prophase
3.
Metaphase
4.
Telophase
a.
Chromosomes line up at the center of the cell.
b.
The DNA is organized into connected rods called chromosomes.
c.
New cells begin to form.
d.
The chromosomes are separated and move to opposite sides of the cell.
Answers
Answer:
1.) Anaphase ------> D.) The chromosomes are separated and move to opposite sides of the cell.
2.) Prophase -------> B.) The DNA is organized into connected rods called chromosomes.
3.) Metaphase -------> A.) Chromosomes line up at the center of the cell.
4.) Telophase ------> C.) New cells begin to form.
When adding sugar to tea, it was observed that the sugar kept dissolving. After a
minute, all of the sugar was completely dissolved, as no extra particles can be
added and be seen floating around. The mixture is then considered to be
Answers
Answer: When adding sugar to tea, it was observed that the sugar kept dissolving. After a minute, all of the sugar was completely dissolved, as no extra particles can be added and be seen floating around. The mixture is then considered to be
Explanation:
The molecule of mixture cannot be seen hence, it will be considered as homogeneous mixture.
What is molecule?
A molecule is just a collection of more than two atoms bound together by chemical bonds; depending on the context, the phrase doesn't have to include ions that meet this requirement.
What is homogeneous mixture?Solids, liquids, as well as gases, can all be homogeneous mixtures. Through, they have almost the same look and chemical makeup.
When sugar will be dissolved, the sucrose molecules get separated from one another. The materials that make up individual molecules stay together like sucrose molecules sucrose molecules, so the molecule will not break up.
Therefore mixture can be considered as molecule and homogeneous mixture.
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Which refers specifically to a heated solution that holds more dissolved solution than it can hold at a lower temperature?.
Answers
Answer:
Supersaturated solution
Explanation:
Weren't there any options?
Anyways, the best I can think of right now is a supersaturated solution.
What differences do you notice when you heat up the brick and the iron at same temperature?
Answers
After heating the brick and the iron, it is observed that the brick heats up quicker and the brick releases energy quicker.
What is thermal energy?Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
The iron has more energy than the brick even though it is at the same temperature. That means that the iron must have more particles than the brick.
Iron and brick are both solids and have the same volume, so the difference in total energy must be due to atomic composition.
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A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder?
Answers
The number of molecules of oxygen in the cylinder is 6.02×1023 molecules
Data obtained from the question
Number of mole of oxygen = 1 mole
Number of molecule of oxygen =?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×1023 molecules. This implies that 1 mole of oxygen contains 6.02×1023 molecules.
Since the cylinder contains 1 mole of oxygen, then the number of molecules of oxygen present in the cylinder is 6.02×1023 molecules.
A solution of potassium nitrate is made when potassium nitrate dissolves in water.
Describe a method you could use to obtain crystals of potassium nitrate from
potassium nitrate solution.
You should include an explanation of the process by which the crystals are produced
from the solution.
[6 marks]
Answers
Answer:
Boil the water and stir in potassium nitrate. If it doesn't all dissolve, you can cook it on the stove or microwave it until the water boils again. Remove the solution from heat, but let it cool slowly for the best crystal formation.
What kind of scientist would study how mistletoe harms trees
Answers
Answer:
A Dendrologist! They are the type of Scientist that studie trees.
How does engineering affect the amount of human labor needed to harvest rice?
Answers
Answer:
Yes
Explanation:
The first step of harvesting is draining the paddy. Next, farmers cut the plants -- with a scythe or sickle if by hand -- and transport them elsewhere to be laid out and dried for two or three days. Rice can be cut by hand or machine. In the developed world, harvesting by hand is still very common.
Select the correct answer.
a sample of an element was poured from one container into a second container. it took on the shape of the second container. it was then
cooled. after cooling, the element was removed from the container and kept its new shape. what happened to the atoms of the element wt
they were cooled in the second container?
oa. they began to escape into the air.
ob. they stopped being attracted to nearby atoms.
oc. they stopped moving past the atoms around them.
od. they began to move more quickly.
Answers
Identify which substitution product is expected to be favored. Explain. The inverted product is expected to predominate slightly, due to SN2 competition. The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
Answers
The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
What is substitution product?Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.
Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
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The elaboration likelihood model emphasizes the use of __________ persuasion and __________ persuasion methods. a. direct . . . elaborative b. peripheral . . . elaborative c. direct . . . peripheral d. indirect . . . direct
Answers
The elaboration likelihood model emphasizes the use of direct persuasion and peripheral persuasion methods.
What is direct persuasion and peripheral persuasion?
This theory involves a dual process which explains how attitudes are changed in individuals through persuasion.
These methods help in the formation of attitude which makes, in this case, option use of direct persuasion and peripheral persuasion.
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Answer:
C. direct . . . peripheral
Explanation:
Because I said so.
ANS THIS SMALL QUESTION
Answers
What errors did the chemistry teacher make in planning to this demonstration and how could checking her work have made a difference?
*THERE ARE A TOTAL OF 4 ERRORS* NEED HELP ASAP BEFORE 11:59 PM
With the hope of sharing an explosive combustion reaction demonstration in class
for her students, a chemistry teacher decides to synthesize water. This process
occurs when oxygen gas (O₂) in the air is combined with hydrogen gas, H₂, in the
presence of a spark or small flame. Like the reactants, the water (H₂O) product is
also a gas.
She knew she didn't want the demonstration to create too much water product,
only 180.0 grams.
Since the oxygen reactant is abundantly present in the air, she needed only to
determine how much hydrogen gas to prepare before class.
She used the following chemical equation to make her predictions:
O2(g) + H2(g) → H₂O(g)
Answers
The teacher used have used standard temperature and pressure values in her calculations of volume of hydrogen gas required.
What is the equation for the synthesis of water?The equation for the synthesis of water is given below as follows:
[tex]2 H_2 + O_2 \rightarrow 2H_2O[/tex]
Based on the planned steps of the synthesis of hydrogen gas by the teacher, the following errors were committed by the teacher:
She used temperature in degrees Celsius for her calculations She used the mass of water required instead of moles of water in her calculation using the ideal gas equation She did not use standard temperature and pressure measurement in her calculations She used an unbalanced chemical equation for her calculationTherefore, in calculation molar volume of gases, the measurements should be taken at standard temperature and pressure values.
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Sodium hydroxide (NaOH) is a strong base that is very corrosive. What is the mass of 2.75 × 10-4 moles of NaOH?
3.24 x 10–3 g NaOH
1.10 x 10–2 g NaOH
6.10 x 10–2 g NaOH
6.50 x 10–2 g NaOH
Answers
The mass of 2.75 × [tex]10^{-4}[/tex]moles NaOH will be 1.1 x [tex]10^{-2}[/tex] grams
Mass/mole relationshipRecall that:
Mole = mass/molar mass.
Thus, mass = mole x molar mass.
In this case, the mole is 2.75 × [tex]10^{-4}[/tex] moles and the molar mass of NaOH is 40 g/mol.
Mass = 2.75 × [tex]10^{-4}[/tex]x 40 = 1.1 x [tex]10^{-2}[/tex] grams
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Answer:
Answer is option B or:
1.10 x 10–2 g NaOH
Explanation:
hope this helps! (edge)
PLS I WILL GIVE BRAINLY How do the number of violence electrons of the light metals compared to those heavier than boron
Answers
The valence electron of the light metals are all in the range of 1 to 3.
What are Valence electron ?Valence Electron is the number of electrons in the outer shell of an atom which participate in bond formation.
Number of Valence Electron in Boron is 3 and other light metals lighter than Boron have 1 , 2 of Lithium and Beryllium respectively,
The valence electron of the light metals are all in the range of 1 to 3.
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Check Your Learning
What mass of CO is required to react with 25.13 g of Fe2O3
according to the equation Fe₂O3 + 3 CO2 Fe + 3CO₂?
Answers
Answer:
convert the 25.13 g of Fe2O3 into moles by dividing by its molar mass (159.69) to get that. When looking at the stoichiometric coefficients, we can see that for every 1 mole of Fe2O3, there needs to be 3 moles of CO.
Explanation:
if energy can neither be created nor destroyed, into what kinds of energy have these resources been transformed?
Answers
Answer:
Heat, Sound
Explanation:
I am pretty sure you are addressing mechanical energy and machine efficiency. So you are probably aware a machine can't achieve 100% efficiency because of the first and second laws of thermodynamics. This energy is lost to friction and air resistance. They convert some gravitational potential energy to heat and sound energy rather than all to kinetic energy, and vice versa.
Based on Charles's law, which of the following statements is true for an ideal gas at a constant pressure and mole amount?
The number of collisions is independent of volume.
The number of collisions decreases with increase in volume.
Volume is directly proportional to absolute temperature.
Volume is inversely proportional to absolute temperature.
Answers
Answer:
the number of collisions is independent of Volume.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
What is Charles's law?Gases have a propensity to expand while heated, according to Charles' law, an innovative gas law.
What is collisions?A collision would be any situation in where two or even more bodies quickly number of factors on one another.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
Therefore, the correct answer will be option (A).
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If the pressure starts at 36 Kia what is the final pressure
Answers
answer:
is Well-Known Member. For a 35" you should be in the 28-32 range on road.
Explanation:
your welcome make brainlist
Name all these please I need help. Write the names of the fallowing accoring to the IUPAC rules.
Answers
#1
You used red pen highlight which made things messier
The correct name should be.
9-methyl dec-1,2-dieneAs a methyl group attached with 9th carbon
#2
methyl group at 4
double bond at 2
4-Methyl Pent-2-ene#3
Three methyl groups are present
Double bond at 2
2,5,5-Trimethyl Hex-2-ene#4
2,5-Dimethyl Hept-3,5-diene#5
2,5-Dimethyl Hex-3-ene
Identify the polarity of an H-I bond and the polarity of an S-S bond?
Answers
Answer:
5095 JULLITET LI\
Explanation:
One atomic mass unit ( 1 amu)
is equal to the mass of a carbon-12 atom multiplied by the quantity
Answers
Answer: 1/12
Explanation:
A carbon-12 atom has a mass of 12 amu, so multiplying this by 1/12, we get 1 amu.
How many atoms are in 3.2 moles of N2
Answers
Answer:
38.54 x 10^23 atoms of N2
Explanation:
Each mole contains Avagadro's Number ( 6.022 x10^23) of particles
3.2 x 6.022 x 10^23 = 19.27 x 10^23 MOLECULES
N2 is TWO atoms soooo 2 x 19.27 x 10^23 = 38.54 x 10^23 atoms
Write the balanced equations for the following nuclear reactions.
ASAPPP
Answers
[tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.
What are balanced equations?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products
Uranium-233 is produced by the neutron irradiation of thorium-232. When thorium-232 absorbs a neutron, it becomes thorium-233, which has a half-life of only 22 minutes.
Hence, [tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.
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