The molar mass of the unknown gas in the 500 mL flask at stp is 89.7 g/mol
We'll begin by calculating the number of mole of the gas that occupied 500 mL at stp.
Recall at stp:
22400 mL = 1 mole of the gas
Therefore,
500 mL = 500 / 22400 = 0.0223 mole of gas.
Finally, we shall determine the molar mass of the gas. This can be obtained as follow:
Mass of gas = 2 g
Mole of gas = 0.0223 mole
Molar mass of gas =?Molar mass = mass / mole
Molar mass of gas = 2 / 0.0223
Molar mass of gas = 89.7 g/molTherefore, the molar mass of the unknown gas is 89.7 g/mol
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Answer them please thanks
Answer:
(3) sorry if I'm wrong
7. (1-fertilization [sorry if wrong again]
8. (4-mitosis
Explanation:
I'm learning about this right now...Sorry if I'm wrong but I'm pretty sure they're right! Hope this helps tho! if I'm right maybe mark me brainliest?
A 2 kg ball is thrown into the air with a velocity of 10 m/s2. What is the kinetic energy of the ball?
a:60
b:90
C:50
D:100
Answer:
D
Explanation:
k.E= ½mv²
= ½×2×10²
=100
An excess of oxygen reacts with 451.4 g of lead, forming 374.7 g of lead(II) oxide. Calculate the percent yield of the reaction.
Answer: The percent yield of the reaction is 77.0 %
Explanation:
[tex]2Pb+O_2\rightarrow 2PbO[/tex]
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
[tex]\text{Number of moles of lead}=\frac{451.4g}{207.2g/mol}=2.18moles[/tex]
[tex]\text{Number of moles of lead oxide}=\frac{374.7g}{223.2g/mol}=1.68moles[/tex]
According to stoichiometry:
2 moles of [tex]Pb[/tex] produces = 2 moles of [tex]PbO_2[/tex]
2.18 moles of [tex]Pb[/tex] is produced by=[tex]\frac{2}{2}\times 2.18=2.18moles[/tex] of [tex]PbO_2[/tex]
Mass of [tex]PbO_2[/tex] =[tex]moles\times {\text {Molar mass}}=2.18\times 223.2g/mol=486.6[/tex]
percent yield =[tex]\frac{374.7g}{486.6g}\times 100=77.0\%[/tex]
PLEAE HELP ASAP WILL MARK BRAINLYLIST! Question 2 the answers are under 2
Answer:
Alkali Metals
Explanation:
They're the most reactive elements in group one.
A chemical equation is shown:
Al + O2 A1203
According to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction?
6
5
3
2
Answer:
Well the answer of 1 and 3 is WRONG based on the 1 star review and the answer of 3 is wrong too I just took a test with this question.
Explanation:
Sorry...
Answer:
it's 6
Explanation:
I just took the test and got it right
Why do the elements get smaller as you move from the left side to the
right side of the periodic table?
Which material is found in asteroids?
Answer:
Asteroids are made of rock, metals, and other elements. Some even contain water. Asteroids that are mostly stone sometimes are more likely to lose piles of rubble. Asteroids that are mostly iron are more rock-solid.
Explanation:
Answer:
asteriods are made of rocks. asteroids that are mostly iron are more, well, rock-solid
Explanation:
Helium only needs _____ electrons to fill its outer level.
A sample of 87.6 g of carbon is reacted with 136 g of
fluorine gas to produce carbon tetrafluoride. Using
the balanced equation below, predict which is the
limiting reactant and the maximum amount in moles
of carbon tetrafluoride that can be produced.
C +2F2 → CF4
A. fluorine, 1.79 moles
B. carbon, 7.29 moles
C. fluorine, 6.72 moles
D. carbon, 4.63 moles
Answer:
A. fluorine, 1.79 moles
Explanation:
Given parameters:
Mass of carbon = 87.7g
Mass of fluorine gas = 136g
Unknown:
The limiting reactant and the maximum amount of moles of carbon tetrafluoride that can be produced = ?
Solution:
Equation of the reaction:
C + 2F₂ → CF₄
let us find the number of the moles the given species;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
C; molar mass = 12;
Number of moles = [tex]\frac{87.7}{12}[/tex] = 7.31moles
F; molar mass = 2(19) = 38g/mol
Number of moles = [tex]\frac{136}{38}[/tex] = 3.58moles
So;
From the give reaction:
1 mole of C requires 2 moles of F₂
7.31 moles of C will then require 2 x 7.31 moles of F₂ = 14.62moles
But we have 3.58 moles of the F₂;
Therefore, the reactant in short supply is F₂ and it is the limiting reactant;
So;
2 moles of F₂ will produce mole of CF₄
3.58 moles of F₂ will then produce [tex]\frac{3.58}{2}[/tex] = 1.79moles of CF₄
How does the VSEPR theory explain molecular shape?
A. Valence electrons modify core electron orbitals.
B. Intermolecular forces distort electron bonds.
C. Electron pair attractions pull atoms together.
D. Electron pairs repelling each other push atoms apart.
Answer:
D. Electron pairs repelling each other push atoms apart
Explanation:
Hope this helps :) I just got it wrong on ap3x so I'm sure this is right
The VSEPR theory explain molecular shape by stating that the Electron pairs repelling each other push atoms apart. Hence, Option (D) is correct
What is VSEPR theory ?
Valence shell electron pair repulsion (VSEPR) theory, is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.
It is also named the Gillespie-Nyholm theory after its two main developers, Ronald Gillespie and Ronald Nyholm.
Therefore, The VSEPR theory explain molecular shape by stating that the Electron pairs repelling each other push atoms apart. Hence, Option (D) is correct.
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Present day glaciers are found primarily in_____
A. Canada and Greenland
B. Canada and Iceland
C. Antarctica and Greenland
D. Antarctica and Iceland
C. Antarctica and Greenland
7th grade help me plzzzzz
Answer:
A & B
Explanation:
The answer for the first one is A because the proton is found in the nucleus with the neutron
The answer for the second was is B because the Neutrons, protons and electrons are all subatomic particles, as they are the main particles that make up an atom.
Proton = Positive Charge (+)
Neutron = Neutral charge (=)
Electron = Negative Charge (-)
Answer:
1- positive
2- A
3-A
Explanation:
A commonly held idea about influenza is that it is a disease that occurs primarily in cold weather. Doctors report incidences of illness, such as influenza, to the Centers for Disease Control (CDC). The graph below shows data for three flu seasons. Note that this graph shows data from October, week 40, of one year to July, week 28, of the following year.
Which evidence supports this idea?
The graph line for 2008-09 has the highest peaks for flu.
All three graph lines show different patterns throughout the year.
The graph line for 2008-09 has a peak in week 44.
All three graph lines peak over the same few weeks of winter.
Answer:
D.All three graph lines peak over the same few weeks of winter.
Explanation:
took the test
What Happens When Stress builds faults? O Energy is Absorbed O Rock can bend and break O Plates form on the lithosphere O Earthquakes develop at Earths surface
Answer:
Rock can bend and break
Explanation:
Btw I got it right
When stress builds faults, what happens is that: B. Rock can bend and break.
A rock can be defined as a solid naturally occurring landform that is made up of various minerals.
In Geology, stress can be defined as a force that acts on a rock per unit area.
There are four (4) main types of of stress associated with rocks and these are:
Tension: it is a stress typically caused by rocks pulling apart, which makes them to either increase in length or break apart.Shearing: it is a stress typically caused by rocks being pushed in opposite direction due to the effect of parallel forces.Compression: this is a stress that is caused by rocks pushing together, which makes them to either bend (fold) or fracture (break).Confining stress: it is a stress typically caused by rocks being pushed down by the weight of any material atop it.In conclusion, rocks can bend and break when stress builds up faults in them.
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PLEASE HELP!! I WILL MARK THE 1st ONE BRAINLIEST!
Answer:
I hope you do well on the test good luck
Explanation:
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!
WRITE A SHORT PASSAGE ON HOW FIBRES ARE SPUN
HELPPP WILL MARK AS BRAINLIEST
Answer: Spun yarn is made by twisting staple fibers together
To make a cohesive thread Or “single”. Twisting fibers, into yarn in the process called spinning can be dated back to the upper Paleolithic. Yarn spinning was one of the first processes to be industrialized.
Explanation:
C3H8+5o2--->3co2+4H2o. How many moles of o2 are there? Help
Answer:
what is the question i don't understand
Why do you need to use soap when you wash oil from your hands
Answer:
Germs stick to the oil on your hands, and washing with just water doesn't work because oil and water don't mix, but soap dislodges the germs and oil from your hands
Explanation:
Answer:
You need soap to wash the oil off your hands because oil and water don't mix well and makes it difficult to remove
Explanation:
Which of the following macromolecule is the main energy source for most living organisms?
A. Nucleic Acids
B. Carbohydrates
C. Lipids
D. Proteins
Answer:
Carbohydrates
Explanation:
Living things use carbohydrates as their main source of energy. The breakdown of sugars, such as glucose, supplies immediate energy for cell activities. Plants, some animals, and other organisms also use carbohydrates for structural purposes.
How many protons does zinc have in its atom?
a. 65
b. 35
C. 30
d. 95
Answer:
35
Explanation:
Answer:
C. 30
Explanation:
Use APE
Atomic number = Protons = Electrons
30=30
Type in the name of the following compounds. Be sure to use the periodic table if needed.
Answer: Sulfuric Acid
Explanation: correct on edg
Answer:
Sulfuric Acid
Explanation:
correct on edg
Calculate the pH in the titration of 25.0 mL of 0.100 M acetic acid by sodium hydroxide after the addition to the acid solution of 10.0 mL of 0.100 M NaOH. (Ka for acetic acid is 1.8x10-5.)A.8.72B. 12.22C. 7.14D. 4.57
Answer:
see the pic for more detail
The pH of the solution after the titration has been 1.318.
pH can be defined as the negative logarithmic values of the hydrogen ion concentration in the solution.
The remaining acid solution has been responsible for the pH of the solution.
The moles of acid can be given by:
Moles = Molarity × Volume
Moles of acetic acid = 0.1 M × 0.025 L
Moles of acetic acid = 0.0025 moles
Moles of NaOH = 0.1 M × 0.01 L
Moles of NaOH = 0.001 moles.
By the neutralization reaction, the moles of acid remaining has been:
Mole of acid remaining = Moles of acid - Moles of NaOH
Moles of acid remaining = 0.0025 - 0.001
Moles of acid remaining = 0.0015 moles.
The hydrogen ions liberated by the acetic acid have been equivalent to the moles of acetic acid.
Thus, the moles of hydrogen ions = 0.0015 mol.
The concentration of hydrogen ions has been:
Molarity = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]
Molarity of hydrogen ion = [tex]\rm \dfrac{0.0015}{0.025\;+\;0.01\lL}[/tex]
Molarity of the hydrogen ion has been = 0.0428 M.
The pH of the solution has been:
pH = -log [Hydrogen concentration]
pH = -log (0.0428)
pH = 1.318.
The pH of the solution after the titration has been 1.318.
For more information about the pH of titration, refer to the link:
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We must __________ forces to calculate net force if the forces are going in OPPOSITE directions.
options:
add
or
subtract
Answer:
subtract
Explanation:
To find the net force of two bodies going in opposite directions, we must subtract the forces this is because they are not additive forces.
The net force is the resultant force acting on a body. This resultant force is the single force that will produce the same effects as all given forces. When forces are directed oppositely on a body, they are subtracted from each other to find the net force.Explain why methyl propyl ether forms both methyl iodide and propyl iodide when it is heated with excess HI.
Answer:
Methyl propyl ether protonates at oxygen, and this makes the oxygen a good leaving group for [tex]SN2[/tex] attack by iodide ion which is a good nucleophile.
We are aware that [tex]SN2[/tex] prefers 1 degree carbocation and here both methyl , propyl group is 1 degree.
So we have two possible carbon atoms to react with iodide which are methyl group and propyl group. They will react with iodide at similar rates, and so there is no great preference of one over the other.
As [tex]HI[/tex] is present in excess the hydrogen of [tex]HI[/tex] protonates the oxygen which leads to cleavage that can happen on both sides either methyl or propyl side leading to different products.
The reaction proceeds in the manner
[tex]CH3-O-CH2CH2CH3[/tex] + [tex]HI[/tex] → CH3I + CH3CH2CH2OH
OR
[tex]CH3-O-CH2CH2CH3[/tex] + [tex]HI[/tex] → CH3OH + CH3CH2CH2I
1. A student is titrating 0.61 M KOH with 14.5 mL of 0.47 M H2SO4
ii. What volume of 0.61 M KOH is needed to titrate the H2SO4?
ii. What mass of water can be produced if 131 g of the H2SO4 solution react with 225 mL
of 0.61 M KOH?
Can someone help me with this?
Answer:
M KOH = 0.61 M
V H2SO4 = 14.5 ml
M H2SO4 = 0.47 M
Volume KOH = ?
( V . M . valensi) KOH = (V . M . valensi) H2SO4
V . 0.61 . 1 = 0.47 . 14.5 . 2
V KOH = (0.47 . 14.5 . 2) / 0.61
V KOH = 22.34 ml
see more the answer at the pic
Identify whether each of the following is a reason for peer review or a problem with peer review.
Rejects new methods:
Identifies sources of errors:
Directs funding:
Takes time:
Sometimes fails:
Answer:
hope this helps you
Explanation:
Rejects New Methods: problem with peer review
Identifies sources of errors: reason for peer review
Directs funding: reason for peer review
Takes time: problem with peer review
Sometimes fails: problem with peer review
Answer:
Rejects new methods:
✔ problem with peer review
Identifies sources of errors:
✔ reason for peer review
Directs funding:
✔ reason for peer review
Takes time:
✔ problem with peer review
Sometimes fails:
✔ problem with peer review
Explanation:
Pls pls pls pls pls pls help
which subatomic particles have no charge (they are neutral)?
Answer:
neutron
Explanation:
Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge
Answer:
neutrons
Explanation:
protons are positive and electrons are negative
Transmission occurs when waves pass through...
a mirror.
aluminum foil.
plastic wrap.
a steel beam.
Draw and name the structures of the carboxylic acids and esters you put together using molecular models.
Answer:
This question is incomplete
Explanation:
However, when the carboxylic acids and esters put together are obtained, the procedure below can be followed in drawing and naming them.
For carboxylic acid,
1) it should be noted that the functional group here is -COOH which is drawn as -C = OH
|
OH
2) The carbon of the functional group is included among the carbon to be counted when naming the structure. For example, the compound below is propanoic acid.
CH₃CH₂COOH - As you can see that there are 3 carbons linked chain there.
3) As can be seen in (2) above, the suffix "oic" is used to name carboxylic acids
4) The carbon chain here is saturated (meaning there is no double or triple bond within the carbon chain)
Example of a structure of carboxylic acid is
H₃C - CH₂ - CH₂ - C = OH
|
OH
The structure above is a butanoic acid
For ester
1)The functional group here is -COO- . which can be drawn as
- C = O
|
O -
(meaning one oxygen atom is double bonded to the carbon and the other oxygen atom is bonded to another carbon chain)
2) The alkyl group attached to the oxygen atom is first of all mentioned before the carbon chain attached from the left is mentioned. For example, CH₃CH₂CH₂COOCH₂CH₃ is ethyl butanoate
3) As seen from (2) above, the suffix "oate" is used to end the name of esters
4) As also seen from (2) above, the carbon of the functional group is also included while counting the carbon chain of the parent name (butanoate).
5) The carbon chains here are also saturated.
Example of this ester is
CH₃CH₂C = O
|
O - CH₂CH₃
The name of this compound is ethyl propanoate