Answer:
146.5g/mol
Explanation:
The volume of gas effused is directly proportional to the square root of its relative molecular mass.
Let the volume of oxygen gas be V1
Let the volume of the unknown gas be V2
Let the molar mass of oxygen be M1
Let the molar mass of the unknown gas be M2
V1/V2 =√M2/M1
7.88/3.69 = √M2/32
2.14 = √M2/32
(2.14)^2 = M2/32
4.58 = M2/32
M2 = 32*4.58
M2 = 146.5g/mol
The temperature of a 10g sample of iron was raised by 25.4ᵒC with the addition of 114 J
of heat. What is the specific heat of iron?
Answer:
28956J
Explanation:
Specific heat capacity is equal to mass × heat capacity × temperature change
Shc = mCtheta
= 10 × 114 ×25.4
= 28956J
The partial pressure of F2 in a mixture of gases where the total pressure is 1.0 atm, is 0.33 atm. What is the partial pressure of the other gases in the container?
Answer:
Partial Pressure Formula
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.
Explanation:
You have a 5M stock solution of NaCl (Formula Weight: 58.44g/mole), a 0.25M stock solution of glucose (Formula Weight; 180.156g/mole), and a bottle of solid Tris base (Formula Weight: 121.1g/mole). How would prepare (be specific) 250mL of a single solution containing 150mM Tris, 25mM glucose, and 150mM NaCl. g
Answer:
4.54g of Tris base,25mL of the 0.25M stock solution of glucose and 7.5mL of the 5M stock solution of NaCl must be added and complete the volume in a volumetric flask to 250.0mL
Explanation:
To prepare the single solution we need to find the moles of each solute (Tris, glucose and NaCl) from the stock solutions anf the solid:
Moles Tris:
0.250L *(0.150mol / L) = 0.0375moles Tris * (121.1g/mol) = 4.54g of Tris base must be added
Moles glucose:
0.250L * (0.025mol/L) = 6.25x10⁻³mol glucose * (1L / 0.25mol) = 0.025L = 25mL of the 0.25M stock solution of glucose must be added
Moles NaCl:
0.250L * (0.150mol / L) = 0.0375mol NaCl * (1L / 5mol) = 0.0075L =
7.5mL of the 5M stock solution of NaCl
You must add:
4.54g of Tris base,25mL of the 0.25M stock solution of glucose and 7.5mL of the 5M stock solution of NaCl must be added and complete the volume in a volumetric flask to 250.0mL
Many food chains together create a______
For the formula C4H9Cl , calculate the index of hydrogen deficiency (IHD) and select all the types of unsaturation that might be present in the molecule based on the IHD.
Answer:
IHD = 0; no unsaturation in the formula
Explanation:
The IHD is also known as the degree of unsaturation formula. This formula is commonly used to get an idea of how many unsaturations a molecule has, and in this way, we can get an approach of the type of compound we are treating. For example, if this number is 1, it means that the compound has at least one unsaturation and it could be a double bond or just cyclical compound.
The IHD is calculated using the following expression:
IHD = (a + 1) - (b + x - c)/2 (1)
Where:
a: number of carbon
b: number of hydrogens
c: humber of nitrogens
x: number of halogens.
Now, we have the formula C₄H₉Cl, let's identify a, b, c and x:
a: 4 carbons; b = 9 hydrogens; C = none; X: 1 chlorine
Replacing in (1) we have:
IHD = (4+1) - (9+1)/2
IHD = 5 - (10/2)
IHD = 0So this number is 0, which means that the molecule does not have any kind of unsaturation (Non double bond, multi bond or cyclical).
Hope this helps
WHAT IS A PLACE WHERE BOOKS ARE CLASSIFIED! I NEED HELP!
Answer:
From the Online Catalog to the Shelf
Libraries in the United States generally use either the Library of Congress Classification System (LC) or the Dewey Decimal Classification System to organize their books. Most academic libraries use LC, and most public libraries and K-12 school libraries use Dewey.
Explanation:
Answer:
From the Online Catalog to the Shelf
Libraries in the United States generally use either the Library of Congress Classification System (LC) or the Dewey Decimal Classification System to organize their books. Most academic libraries use LC, and most public libraries and K-12 school libraries use Dewey.
Convert 65.4 m to mm.
Helppp please
Answer:65.4 meters= 65400 millimeters
What are the missing coefficients for the skeleton equation below? Cr(s) + Fe(NO3)2(aq) → Fe(s) + Cr(NO3)3(aq)
Answer:
2 3 3 2
Explanation:
Where does the light that makes the moon visible come from?
A. another planet
B. the moon
C. Earth
D. the sun
Organelles_____are specialized structures that carry out particular jobs and functions?
Answer:
Cell or cellular
Explanation:
Heyy!! Not sure, but cell and cellular are the same. They carry out particular jobs and functions. Hope this helps, thank you :) !!
xAl(OH)3 + yH2SO4 ⟶ zAl2(SO4)3 + kH2O?
Answer:
2Al(OH)3 + 3 H2SO4 = Al2(SO4)3 + 6H2O
Explanation:
Name each of the following species for the following acid-base reactions. (The equilibrium lies to the right in each case, i.e., the product side is favored. If the species is an ion, include the word "ion" in the name. Use systematic names such as "methanol" instead of archaic names like "methyl alcohol" or "wood alcohol".)
(a) H3O+ (hydronium ion) + CH3O- (methoxide ion) <--> *reverse reaction arrow*
acid:?
base:?
conjugate acid:?
conjugate base:?
(b) CH3CH2O- (ethoxide ion) + HCl (hydrogen chloride) <--> *reverse reaction arrow*
acid:?
base:?
conjugate acid:?
conjugate base:?
(c) NH2- (amide ion) + CH3OH (methanol) <--> *reverse reaction arrow*
acid:?
base:?
conjugate acid:?
conjugate base:?
Answer: a) [tex]H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O[/tex]
acid : hydronium ion
base : methoxide ion
conjugate acid : methanol
conjugate base: water
b) [tex]CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-[/tex]
acid : hydrogen chloride
base : ethoxide ion
conjugate acid : ethanol
conjugate base: chloride ion
c) [tex]NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-[/tex]
acid : methanol
base : amide ion
conjugate acid : ammonia
conjugate base: methoxide ion
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
The species accepting a proton is considered as a base and after accepting a proton, it forms a conjugate acid.
The species losing a proton is considered as an acid and after loosing a proton, it forms a conjugate base
For the given chemical equation:
a) [tex]H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O[/tex]
acid : hydronium ion
base : methoxide ion
conjugate acid : methanol
conjugate base: water
b) [tex]CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-[/tex]
acid : hydrogen chloride
base : ethoxide ion
conjugate acid : ethanol
conjugate base: chloride ion
c) [tex]NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-[/tex]
acid : methanol
base : amide ion
conjugate acid : ammonia
conjugate base: methoxide ion
.
What is the biggest difference between thermal energy and temperature?
Answer:
Heat deals more with thermal energy whereas temperature deals with molecular kinetic energy.
How does an atom become a positively charged ion?
How many grams of KCl are produced if 25g of KCIO3 decompose?
2KCIO3
2KCI
+
302
Answer:
15 g
Explanation:
The reaction that takes place is:
2KCIO₃ → 2KCI + 3O₂First we convert 25 g of KCIO₃ to moles, using its molar mass:
25 g ÷ 122.55 g/mol = 0.204 mol KCIO₃Then we convert KCIO₃ moles to KCl moles, using the stoichiometric coefficients:
0.204 mol KCIO₃ * [tex]\frac{2molKCl}{2molKClO_3}[/tex] = 0.204 mol KClFinally we convert KCl moles to grams, using the molar mass of KCl:
0.204 mol KCl * 74.55 g/mol = 15.2 gThe octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8H18). Like most hydrocarbons, octane reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is
Answer:
C₈H₁₈(l) + O₂(g) ⇒ CO₂(g) + H₂O(l)
Explanation:
Let's consider the unbalanced equation for the combustion reaction of octane.
C₈H₁₈(l) + O₂(g) ⇒ CO₂(g) + H₂O(l)
We can begin balancing H atoms by multiplying H₂O by 9, and C atoms by multiplying CO₂ by 8.
C₈H₁₈(l) + O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l)
Finally, we get the balanced equation by multiplying O₂ by 12.5.
C₈H₁₈(l) + 12.5 O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l)
Answer:
The coefficents will be 2, 25 --> 16, 18
Explanation:
Convert 0.859 mg to cg.
Help me plz :(
Answer:
0.0859
Explanation:
Landon is investigating the coastal area near where he lives. He has found that one end of the coastal area without barrier islands is losing beach area, but the other end that is bordered with barrier islands has a beach area that has remained the same size. Why is the size of the beach decreasing on the end without barrier islands?
Answer:
Explanation:
Barrier Islands act just as the name states, they are barriers that protect the beaches. They exist to absorb the majority of the external energies that waves, hurricanes, storms, etc. Without it, the beaches begin to become absorbed by the ocean, due to the destructive energy these factors apply, as well as eroding away all rocks into the ocean. This is mainly why the beach with a barrier island is completely protected while the one without a barrier island is decreasing in size.
Island barriers grow near the continent protecting the coasts from erosive factors. The beach with no islands decreases in size because there are no physical limitations that protect the continent from erosion.
------------------------
Barrier islands are deposition of material -sand or any other substrate- that lay on a rocky surface. They get formed near the continent, parallel to the coasts. They play a significant role in avoiding the erosion process.
These islands receive the direct impact of storms, winds, and waves action. Their shape is very dynamic, being constantly modeled by these erosive factors.
These barriers protect the continent from winds, waves, tides, streams, storms, hurricanes, and any other meteorological event that might cause erosion and destruction.
They absorb the energy produced by erosive factors. They also provide a protected area behind them that allows the formation of estuaries and swamps.
A wide diversity of species inhabit these islands, becoming significant spots to protect their biodiversity.
The beach is decreasing on the end without the barrier islands because there is no physical limitations that can protect the continent from the action of waves, tides, and winds, among others. The coasts get eroded, and the beach gets smaller.
----------------------------------
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After mixing the solutions in a separatory funnel, the stopper should be ________and the liquid should be ________and the layers allowed to separate. When you get close to the interface between the layers, ________the funnel and________until the first layer______ is collected. _______to collect the second layer.
Answer:
The answer is below
Explanation:
The separation technique is used for separating immiscible liquids.
When separating, the stopper has to be removed when draining the lower layer so as to prevent a vacuum. If vacuum is allowed, the draining rate will reduce and stop.
The liquid should be mixed by shaking the funnel and then opening the stopcock so as the vent out gases.
When near interface between the layers, you should set your eye level so that you do not drain up to the second layer.
After completely draining the first layer, the second layer should be collected in a new flask.
After mixing the solutions in a separatory funnel, the stopper should be removed and the liquid should be mixed thoroughly and the layers allowed to separate. When you get close to the interface between the layers, get eye level with the funnel and slow the draining until the first layer is collected. Switch to a new flask to collect the second layer.
After mixing the solutions in a separatory funnel, the stopper should be removed and the liquid should be mixed thoroughly and the layers allowed to separate. When you get close to the interface between the layers, get eye level with the funnel and slow the draining until the first layer is collected. Switch to a new flask to collect the second layer.
Separatory funnel:It is used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities.The lab apparatus majorly used for the separation of the two immiscible solutes in the given mixture. For example, oil and alcohol. It is applicable to separate the solvent which are immiscible and which cannot be separated by steam distillation. This method is useful for liquids only.Learn more:
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Calculate the work done when 1.000 mole of a perfect gas expands reversibly from 1.0 L to 10 L at 298.0 K. Then, calculate the amount of work done when the gas expands irreversibly against a constant external pressure of 1.00 atm. Compare the two values and comment.
Answer:
See explanation
Explanation:
For work done at constant temperature;
w = -nRTln(V2/V1)
V1 = 1.0 L
V2 = 10 L
w = -(1 * 8.314 * 298) ln(10/1)
w = -5704.8 J
When the gas expands irreversibly against a constant external pressure;
w = -(PΔV)
w = -(1.00 (10 - 1))
w = - 9 J
During expansion of a gas in which the initial and final limits of volume are given, the constant pressure process produces more work than the isothermal process as we have seen above.
This molecule can be synthesized from an alkyne anion and an alkyl bromide. However, there are two ways in which this molecule can be formed. One way uses a higher molecular weight alkyne anion (Part 1) and the other uses a lower molecular weight anion (Part 2). Draw the two versions in the boxes below. Omit spectator ions.
For Part 1: Draw the reactants (i.e., alkyne anion and alkyl bromide) needed for the pathway that uses a higher molecular weight alkyne anion:
For Part 2: Draw the reactants (i.e., alkyne anion and alkyl bromide) needed for the pathway that uses a lower molecular weight alkyne anion:
Answer:
See explanation below
Explanation:
First of all, we need to know the molecule that need to be synthesized. In the first picture attached, we have the molecule.
Now, according to that, the molecule can be formed in two ways. Both ways are rather different but we have one thing in common in both ways, and it's the fact that both ways requires the reaction with an alkyne. In one way, with the higher MW and the other with the lowest.
For the first way, when we need to use the higher MW, all we need to do is to put the triple bond in the highest molecule, in this case, a molecule that include the benzene ring, and the other reactant will be the alkyl bromide. You can see the picture of this product below, (Picture 2).
For the second way, the triple bond should be located in the lowest MW, in this case an ethyl group, instead of the benzene ring, and the molecule with the benzene ring would have the bromide. In both cases we will have the same product. See picture 2 for this.
Hope this helps
what is the force on a 1,000 kg elevator that is falling freely at 9.8 m/s2
Answer:
The only force on it is its weight, w=9800N
Explanation:
How many formula units are in 4.52 moles of H3SO3?
Type your answer
Answer:
The answer is 98.07848. We assume you are converting between grams H2SO4 and mole. You can view more details on each measurement unit: This compound is also known as Sulfuric Acid. The SI base unit for amount of substance is the mole. 1 grams H2SO4 is equal to 0.010195916576195 mole.
Quick conversion chart of moles H2SO3 to grams
1 moles H2SO3 to grams = 82.07908 grams
2 moles H2SO3 to grams = 164.15816 grams
3 moles H2SO3 to grams = 246.23724 grams
4 moles H2SO3 to grams = 328.31632 grams
5 moles H2SO3 to grams = 410.3954 grams
6 moles H2SO3 to grams = 492.47448 grams
7 moles H2SO3 to grams = 574.55356 grams
8 moles H2SO3 to grams = 656.63264 grams
9 moles H2SO3 to grams = 738.71172 grams
10 moles H2SO3 to grams = 820.7908 grams
Which of the following statements is NOT true about practice?
When something heats up, new energy is created, and when something cools down, energy is destroyed. Please help! this is science not chemistry.
Answer:
False
Explanation:
This isn't true. Energy is neither created nor destroyed. Heating something makes the particles move faster, but no new energy is created. Cooling results in slower particles, but once again, no energy loss.
The given statement "when something heats up, new energy is created, and when something cools down, energy is destroyed" is absolutely false.
Why energy is not destroyed in a closed system?According to the first law of thermodynamics which states that the energy of a closed system must always remain constant. It can neither be created nor destroyed without any interference from outside. This is the principle of physics.
The same concept is described by chemistry through the name known as The law of conservation of energy. This states that in a chemical reaction energy can never be created or destroyed.
When you heat up something, the movement of particle increase, not energy. Similarly, when you cool down something, the movement of particles or atoms within that decreases, not energy.
Therefore, the given statement "when something heats up, new energy is created, and when something cools down, energy is destroyed" is absolutely false.
To learn more about the Law of conservation of energy, refer to the link:
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A sample of a mixture of salt and sugar has a total mass of 0.8920 g. If the sample contains 0.0982 g of salt, what percent of the sample is sugar?
Answer:
89%
Explanation:
The computation of the sample percentage is sugar is shown below:
As we know that
The mass of the total sample mixture is
= Mass of salt + mass of sugar
= 0.8920
And, the mass of salt is 0.0982 g
So, the mass of sugar is
= 0.8920 - 0.0982
= 0.7938 g
Now the percentage of the sample is sugar is
= 0.7938 ÷ 0.8920
= 89%
A biologist explored a remote island and discovered a new living organism. After several observations were made of the
organism, the biologist claimed that it was a vascular plant. His notes are listed below.
"I have found a new organism during my explorations. The organism was found low to the ground and is green. Based on
experiments, the organism seems to require sunlight to survive. Small, oval seeds were
found on the organism; they grew
into identical organisms when put in the soil. The organism had sharp spikes around the main body, most likely for
protection. The organism was able to absorb water from the surrounding soil. It was also observed that the organism used
specialized veins to carry water throughout its body. Based on these observations and experiments, I have determined that
this organism is a vascular plant."
Which of the following observations LEAST supports his claim?
A)
The organism is low to the ground.
B)
The organism reproduces with seeds.
The organism requires sunlight.
D)
The organism was able to transport water through specialized veins.
A student says that since the atomic theory is just a theory, it should not be considered useful. Which statement best argues against the student's opinion? (2 points) Scientific theories change over time. Scientific theories are the results of many experiments and observations. Scientists often do not agree about specific details of scientific theories. Scientists often propose competing theories. Scientific theories do not become Scientific Laws.
Answer:
Scientific theories are the results of many experiments and observations.
Explanation:
I think this is ti sorry if I'm wrong :|
What is the mass of an object if its potential energy is 800 J and it is 2.0 m above the ground?
Answer:
potential energy = mgh put values and get your answer
2. How do chemical weathering and deposition contribute to the formation of the features shown here?
answer asap
Answer:
Explanation:
Chemical weathering of rocks and minerals is a key factor that mitigates acidic deposition and affects water chemistry. It supplies cations and alkalinity to the surface water, groundwater, ion-exchange complex, and vegetation in the watershed.
Hopefully this will help