2.911 grams of ethanol C2H5OH is burned and produces how many grams of water vapor?
Please help me or I'm dead.
Answer:
3.4g
Explanation:
Given parameters:
Mass of ethanol = 2.911g
Unknown:
Mass of water vapor = ?
Solution:
To solve this problem, let us write the balanced reaction equation first;
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
Now find the number of moles of ethanol;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol
Number of moles = [tex]\frac{2.911}{46}[/tex] = 0.06mole
So;
1 mole of ethanol will produce 3 moles of water vapor
0.06mole of ethanol will produce 0.06 x 3 = 0.19moles of water vapor
Mass of water vapor = number of moles x molar mass
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of water vapor = 0.19 x 18 = 3.4g
A molecular formula shows the arrangement of the atoms in a molecule. True or False?
Answer:
The answer is true
Explanation:
Electrical cords are made up of two layers. The wire inside is made of metal. This is surrounded by a cover made of plastic or rubber. How do the wire and cover compare in their ability to conduct or insulate electricity? A. The wire is a conductor, and the cover is an insulator. B. The wire is an insulator, and the cover is a conductor. C. Both the wire and the cover are insulators. D. Both the wire and the cover are conductors.
Answer:
A
Explanation:
The correct answer would be that the wire is a conductor and the cover is an insulator.
The wire inside an electrical cord is made up of metals and metals are generally considered to be good conductors of heat and electricity. The cover which is made of plastic or rubber, however, are known to be poor conductor of electricity. Hence, the wire are considered to be conductors of electricity while the rubber covers act as insulators to protect users from getting electrocuted.
The correct option is A.
So simple distillation is used to separate a mixture of two immiscible liquids (for example acetone and water) When we are boiling the mixture in the distilling flask, and we reach the boiling point of one of the liquids (example: 56 degrees boiling p of acetone), how do we maintain this temperature and not allow the liquid to gain higher temperature?
Answer:
reduce the heat
Explanation:
the heat should be reduced to prevent the water to reach it's boiling point(70°).
List two examples of items that undergo sublimation
Answer:
Examples of solids that sublime are dry ice (solid carbon dioxide), iodine, arsenic, and naphthalene (the stuff mothballs are made of).
Explanation:
Compare these examples of matter. Which of these is a pure substance and why? A Milk, because every portion of the matter is the same, and its components can only be separated chemically. B Coffee, because every portion of the matter is the same, and its components can only be separated chemically. C Salt water, because every portion of the matter is the same, and its components can only be separated chemically. D Carbon dioxide, because every portion of the matter is the same, and its components can only be separated chemically.
Answer:
B. Coffee
Explanation:
Coffee, because every portion of the matter is the same, and its components can only be separated chemically.
The matter is present everywhere. The matter can be a pure substance, mixture, etc. Coffee is a pure substance that is characterized by constant composition. Thus, option B is correct.
What is a pure substance?A pure substance is defined by the elements and molecules that have the same composition and definite properties and characteristics. All elements and molecules are pure substances.
Coffee is a pure substance that by any physical method cannot be separated into its constituents. They have characteristic chemical and physical properties with a definite composition.
Milk is a colloidal mixture and not a pure substance made of more than combinations. Salt-water is a mixture made of various salts dissolved in water. Similarly, carbon dioxide is a compound made of molecules.
Therefore, option B. coffee is a pure substance.
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Can a stable compound be made from lithium and oxygen
Answer:
No, because oxygen wants two electrons to become stable and lithium will only give up 1 electron.
What effect does pressure have on a gas in a
closed container?
Answer:
La presión de un gas en un recipiente cerrado es inversamente proporcional al volumen del recipiente, cuando la temperatura es constante.LÑÑ
Explanation:
El volumen es inversamente proporcional a la presión: Si la presión aumenta, el volumen disminuye. Si la presión disminuye, el volumen aumenta.
Physical weathering caused by the action of freezing water
Answer:
Frost action involves the ~weathering~ processes caused by repeated cycles of freezing and thawing.
Explanation:
Answer: Physical weathering is caused by the effects of changing temperature on rocks, causing the rock to break apart. The process is sometimes assisted by water. Freeze-thaw occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.
Explanation:
True or false? Salt water takes a shorter time to boil than regular water.
Send help!!!!
Answer:
false
salt water does the oppsotie
Explanation:
THIS is SO easy PLEASE help ME ! ill ALSO mark YOU brainliest !
Tanya planted seedlings in her garden over the weekend. The instructions that came with the seedlings stated that they need to be planted 0.2 meters apart. Tanya has a measuring tape that has values in centimeters. Help Tanya convert meters to centimeters. Determine the ratio to use: . Tanya should plant the saplings 20 centimeters apart. 1 meter is equal to 100 centimeters. Multiply the given value by the ratio: . answer it right now
Answer:
put them 205 centimeters apart
Explanation: i just know
Answer:
1 Meter is equal to 100 centimeters
Determine the ratio to use 100cm/1m
Multiply the given value by the ratio: 0.2m * 100cm/1m
Tanya should plant the saplings 20 centimeters apart
Explanation:
What mass of copper sulphate dissolves in 100g of water at 70 °C
The answer mass of copper sulphate is
46g
The pressure is changed from 500 kPa to 250 kPa. What would you expect the new volume to be if the initial volume is 200 mL?
Answer:
The answer is 400 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
So we have
[tex]V_2 = \frac{500000 \times 200}{250000} = \frac{100000000}{250000} = \frac{10000}{25} \\ [/tex]
We have the final answer as
400 mLHope this helps you
Compared to orange light, violet light
I: has a longer wavelength
II: has a higher frequency
III: has a higher energy
IV: has the same speed
Group of answer choices
II, III
I,III
II, III, IV
I, IV
Answer:
i think it was lll,lV ㄸㄸㅇㅊㅎㅍㅋ
what is at the anode and cathode for Silver carbonate(Ag2CO3)
Answer:
bla bla bla bla hahahhaa jokers
Which situation demonstrates dormancy?
A plant germinates in the spring.
A plant grows leafs laterally.
A plant closes its flowers at night.
A plant becomes inactive and stops growing.
Answer:
Your answer is D
Explanation: Have a nice day or night
(❁´◡`❁)
Answer:
A plant becomes inactive and stops growing!!!
(aka D)
I got it right if you got it right leave a like
Explanation:
HELP
2. The Kinetic Energy of a particle can be represented by _______________.
(2 Points)
A. mass x speed
B. 1/2 mass x velocity
C. mass x velocity
D. 1/2 mass x velocity squared
Answer:
D
Explanation:
How many carbon atoms are represented in the formula for CaMg3(CO3)4
If a decrease in temperature accompanies a reaction, what occurred?
Energy was released.
Energy was destroyed.
Energy was created.
Energy was absorbed.
Surely, when there is a decrease in temperature accompanying a chemical reaction, this indicates that: energy was absorbed.
The correct answer choice is option d.
How energy is absorbed by decreasing temperature in a chemical reaction.In happens that in a chemical reaction which leads to the absorption of energy due to decrease in temperature, this results as a result of the fact that bonds in the reactants of the reaction are broken than it is released
So therefore, we can now deduce and confirm from the explanation given above that it is an endothermic reaction when energy is absorbed by the system.
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A flower's color is a trait that is passed from one generation to the next generation. How a trait such as flower color is physically expressed after being passed from one generation to the next generation is called a(n) Responses A. genotype. B. chromosome. C. phenotype. D. allele.
The noble gases include helium, neon, argon, and xenon. What do their electron configurations have in common?
Answer:
their outer electron shell is full
Explanation:
they are named noble because they are non-reactive
The noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.
What are electrons?Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Electrons are fundamental to many physical processes, including gravity, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity.
Noble gases are defined as any of a class of extremely stable, very slow-reacting rare gases, such as helium, neon, argon, krypton, xenon, and typically radon. In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. They are known as noble gases because of how beautiful they are and how little they generally react with anything. For this reason, they are also referred to as inert gases. The outer shell of the noble gas are completely filled.
Thus, the noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.
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PLEASE i need some help asap it can be any part, I'll be grateful
Answer:
what do u need help with
Explanation:
I can help uu
what is the electron configuration for a neutral atom with five valence electrons
Answer:
pee
Explanation:
ppppppppppppppppppppppppppppppppppppp
3. A student measured 15.0 grams of ice in a beaker. The beaker was then
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at O degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice?
Please help me !
Answer:
The heat that was used to melt the 15.0 grams of ice at 0°C is 4,950 Joules
Explanation:
The mass of ice in the beaker = 15.0 grams
The initial temperature of the ice = 0°C
The final temperature of the ice = 0°C
The latent heat of fusion of ice = 330 J/g
The heat required to melt a given mass of ice = The mass of the ice to be melted × The latent heat of fusion of ice
Therefore, the heat, Q, required to melt 15.0 g of ice = 15.0 g × 330 J/g = 4,950 J
The heat that was used to melt the 15.0 grams of ice = 4,950 Joules.
Which sings shake the room A pop smoke and Quavo B Roddy Ricch C YoungBoy never Broke Again D lil yatchy
Answer:
YoungBoy Never Broke Again. Explanation: He is the goat
Why do the more complex sugar disaccharides store more energy than
monosaccharides?
Answer:
c) disaccharides have more chemical bonds
Explanation:
disaccharides are made from the condensation of two monosaccharides.
This means there are more bonds in disaccharides. More bonds mean greater energy and vice versa .
The chemical equilibrium is given:
2NO (g) + O2(g) <—>2N O2, (g)
In a container of volume 10L is in equilibrium a mixture consisting of 10 mol NO (g), 10 mol O2, (g) and 20 mol NO2, (g).
The volume of the container changes under constant temperature and after the restoration of equilibrium the amount of NO has increased by 25%. Calculate the volume change in L.
How do I find the change in volume?
P.s sorry if my English isn’t perfect.
The volume of NO₂=6.25 L
Further explanationAvogadro's stated :
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume = the ratio of gas moles
[tex]\tt \dfrac{V_1}{V_2}=\dfrac{n_1}{n_2}[/tex]
the volume of each gas (in a container of volume 10L) :
Total mol=10+10+20=40 mol
NO :[tex]\tt \dfrac{10}{40}\times 10=2.5~L[/tex]
O₂ :[tex]\tt \dfrac{10}{40}\times 10=2.5~L[/tex]
NO₂ :[tex]\tt \dfrac{20}{40}\times 10=5~L[/tex]
NO₂ (has increased by 25%) :
[tex]\tt 0.25\times 5~L=1.25\\\\new~volume=5+1.25=6.25[/tex]
O₂ :[tex]\tt \dfrac{10}{20}\times 6.25=3.125[/tex]
NO :[tex]\tt \dfrac{10}{20}\times 6.25=3.125[/tex]
Solute affects the freezing point of a solvent because, it hinders clustering of the solvent particles and forces the molecules away from the cluster. For the solvent molecules to reach the cluster and add themselves to the freezing solid, they have to be decreased to a lower kinetic energy by lowering the temperature
Answer:
They have to be decreased to a lower kinetic energy by lowering the temperature
Explanation:
Solute affects the freezing point of a solvent because, When a substance starts to freeze, the molecules slow down due to the decreases in temperature, and the intermolecular forces start to take over. Therefore, they have to be decreased to a lower kinetic energy by lowering the temperature
What is the activity series of metals?
A. A list of metals arranged in order of atomic number
B. A list of metals arranged in order of electronegativity
C. A list of metals arranged in order of reactivity
D. A list of metals arranged in order of oxidation state
Answer:
C.A list of metals arranged in order of reactivity
The activity series of the metal is the orderly arrangement of the metals based on the reactivities that show the power of one metal to displace another in a reaction. Thus, option C is correct.
What is reactivity series?A reactivity series is the arrangement of the metals that shows the analytical progression and the decreasing order of the reactivity. The reactivity series is also called the activity series.
The chart depicts the vigorous nature of the metal that allows them to displace another in a displacement reaction. The reactivity is based on the element that loses its electron more easily.
The reactivity series is based on the element's ability to displace the hydrogen from the acidic solutions and hence, makes them more reactive than the others.
Therefore, the activity series depicts the reactivity.
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