15.75 moles of oxygen is required for 4.5 mole of ethane.
What is a Combustion Reaction ?The reaction in which a fuel gets oxidized by an oxidizing agent is called a Combustion Reaction , releasing a large amount of energy is called Combustion Reaction.
It is given in the question that
4.50 mole of ethane undergoes Combustion
2C₂H₆ + 7O₂ -> 4CO₂ +6H₂O
Mole fraction of ethane to oxygen is 2:7
Moles of ethane = 4.5
4.5 /x = 2/7
4.5 * 7 / 2 = x
x = 15.75 moles.
Therefore 15.75 moles of oxygen is required for 4.5 mole of ethane.
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V2 = (P1 × V1 × T2) (P2 × T1) A gas with a beginning pressure of 2 atm at a temperature of 300 K has a volume of 20 ml. What will be the new volume if the pressure increases to 4 atm and the temperature is lowered to 200 K?
6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
[tex]V_1=20 ml[/tex]
[tex]T_1=3[/tex]
[tex]P_1=2 atm[/tex]
[tex]T_2=200 K[/tex]
[tex]P_2=4 atm[/tex]
[tex]V_2=?[/tex]
Using equation:
[tex]V_2 =[/tex] [tex]\frac{P_1 X V_1 XT_2}{P_2 X T_1}[/tex]
[tex]V_2 =[/tex][tex]\frac{2 atm X 20 ml X200 K}{4 atm X 300 K}[/tex]
[tex]V_2 = 6.6 ml[/tex]
Hence, 6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
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If 0.094 moles of magnesium react with excess oxygen, how many moles of magnesium oxide would be formed?
The equation for this reaction is
[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]
This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.
So, the answer is 0.094 moles.
In a neutralization reaction, an aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce:.
An aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt.
What is a Salt?This is a compound which is formed as a result of a neutralization reaction between acid and base.
Arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt due to increased concentration of H+ and OH- respectively.
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Which of the following numbers is equal to the value shown in scientific
notation below?
1.9 x 10-2
A.0.0019
B.0.019
C.0.19
D. 0.00019
Explanation:
the answer for the above
is b)0.019
Problems that I am stuck on! Need the answers asap
Answer:
1.b
2.b
3.a
4.a
Explanation:
use the rate laws when answering this.
How do hollow bones improve the survival of birds? (1 point )
Answer:
Hollow bones allow the birds to fly. They're quite dense, and that density allows for flight! Because we humans do not have hollow bones, our bodies are much too heavy to fly on our own. If we did, we'd probably be able to fly.
Explanation:
Select the correct answer from each drop-down menu. 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 .
Taking into account the definition of calorimetry, the mass of water is 35.70 grams.
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance c. ΔT is the temperature variation.Mass of water in this caseIn this case, you know:
For granite:
Mass of granite= 126.1 gInitial temperature of granite= 92.6 °CFinal temperature of granite= 51.9 ºCSpecific heat of granite = 0.795 [tex]\frac{J}{gC}[/tex]For water:
Mass of water = ?Initial temperature of water= 24.7 ºCFinal temperature of water= 51.9 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgranite = + Qwater
- 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
Solving:
4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C
4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water
mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]
mass of water= 35.70 grams
Finally, the mass of water is 35.70 grams.
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Identify the solutions among the following mixtures
Soil, Sea water, Air, Coal, Soda water
Answer:
Out of the above mixtures, seawater, air, and soda water are solutions.
hope this helps :3
Why is it important for scientists to use common units such as the metric system?
A. so they can effectively communicate their findings
B. so they can double check their data
C. so they can form similar hypotheses
D. so they can conduct controlled experiments
Answer:
The correct answer is A, or "so they can effectively communicate their findings.
Explanation:
The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.
Please brainliest answer
I appreciate it :)
Identify a cation. An atom that has gained a proton. An atom that has lost an electron. An atom that has gained an electron. An atom that has lost a proton.
the answer would be B an atom that has lost an electron
I
10. how many grams of koh are there in 200 grams of 10% by mass koh solution?
Answer: 20 grams
Explanation:
[tex]10=\frac{\text{grams of KOH}}{200}\\\text{grams of KOH}=20[/tex]
For which process would the pictured cell be used?
Producing electricity
Splitting a compound into its elements
Purifying a metal
Coating a material with metal
Answer:
Coating a material with metal
(SInce the glasses will be coated with gold.)
An atom has eight protons and nine neutrons. draw the atomic structure of the atom
An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.
What is an atomic structure ?The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.
The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.
An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.
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Which description is true of 0.02 m ca(oh)2 if ca(oh)2 completely dissociates in water?
If [tex]Ca(OH)_2[/tex] completely dissociates in water, it means it is a dilute strong base.
What is a base?A base is a substance that can neutralize the acid by reacting with hydrogen ions.
An acid is a substance that donates hydrogen ions and a base is a substance that accepts hydrogen ions.
Ca(OH)₂ does not have hydrogen ions to donate, but it can accept hydrogen ions to form H₂O according to this equation:
H⁺ + OH⁻ → H₂O.
Hence, Ca(OH)₂ is a base.
A strong base is a base that dissociates completely into metallic and hydroxide ions in aqueous solutions, while a weak base dissociates partially.
Hence, Ca(OH)₂ is a strong base.
Dilute refers to a solution meaning that the substance is not pure and the concentration is low. Since the solution the Ca(OH)₂ is 0.02 M means that it is diluted.
Therefore, we have found that the description of 0.02 M Ca(OH)₂ is a dilute strong base.
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Describe the method you could use to investigate the volume of hydrogen produced during the electrolysis of sodium chloride.
Answer:
Gas tests include:
hydrogen - lighted splint goes out with a squeaky pop.
Explanation:
Identify the examples of experiences. Select three options.
Connie has good hearing ability.
Daryl has visited many other countries.
Alfonso has developed many strong friendships
Thelma has decided to audition for a role in a television show.
Sherry has set a goal of reading fifty books in a year.
Marion has worked at jobs that improved his time-management skills.
i need help!!!
Experience refers to something that happens in a person's life that leaves an indelible mark on the person.
What is an experience?The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.
The following are experiences;
Daryl has visited many other countries.Alfonso has developed many strong friendshipsMarion has worked at jobs that improved his time-management skills.Learn more about experiences:https://brainly.com/question/11256472
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Answer:
Experience refers to something that happens in a person's life that leaves an indelible mark on the person.
What is an experience?
The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.
The following are experiences;
Daryl has visited many other countries.
Alfonso has developed many strong friendships
Marion has worked at jobs that improved his time-management skills.
Explanation:
solve for x
[tex] \bold{x^{2} + 6x + 5 = 0}[/tex]
ty! ~
Answer:
x²+6x+5=0
On comparing with the equation
ax² + bx + c = 0
a=1, b = 6 and c = 5
Now
b²– 4ac = 6² – 4 x 1 x 5 = 36 - 20 = 16
[tex]x = \frac{ - b \:± \: \sqrt{b {}^{2} - 4ac } }{2a} \\ \\ x = \frac{ - 6\:± \: \sqrt{16 } }{2 \times 1} \\ \\ x = \frac{ - 6± {4} }{2} \\ \\ x = \frac{ - 6 + {4} }{2} \: \: or \: \: x = \frac{ - 6 - {4} }{2} \\ \\ \implies \: x = \frac{ \cancel-2 }{ \cancel2}^{-1 }\: \: or \: \: x = \frac{ \cancel-10 }{ \cancel2}^{-5}\\ \\ \implies \: { \blue{\fbox{ \: x = - 1 \: \: \: or \: \: \:x = - 5}}}[/tex]
[tex] {x}^{2} + 6x + 5 = 0 \\ \\ {x}^{2} + 5x + x + 5 = 0 \\ \\ x(x + 5) + 1(x + 5) = 0 \\ \\ (x + 1)(x + 5) = 0.[/tex]
[tex]x = - 1 \\ x = - 5.[/tex]
Indicate how the gas molecules move between the system and the surroundings based on changes in pressure, temperature, and volume and the number of moles.
The gas molecules move between the system and the surroundings follow PV=nRT.
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance.
An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.
In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.
The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.
At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.
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TRUE OR FALSE
Q1.) Is the distances of the gas molecules are far greater than it's molecule dimensions.?
Q2.) The movement of any gas particle/molecules is directly affected by temperature.?
｡ﾟ(TヮT)ﾟ｡ H-Help me with this pls...,,
Answer:
Q1. False
Q2. True
Explanation:
gas molecules are not that at far than dimensions molecules
What is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4oC?
[tex]\text{Given that,}\\\\\text{Pressure,}~ P = 1.99~ \text{atm}\\ \\\text{No. of moles,}~ n = 0.182~ \text{mol.}\\\\\text{Temperature,}~ T = 83.4^{\circ}~ C = 356.4~K\\\\ \text{Molar gas constant,}~ R = 0.082~ \text{L}~ \text{atm}~ \text{mol}^{-1}~ \text{K}^{-1}\\\\\text{Volume,}~ V =?\\\\\text{We know that,}~\\\\~~~~~~~PV =nRT\\\\\implies V = \dfrac{nRT}{P}\\\\\\~~~~~~~~~~=\dfrac{0.182 \times0.082 \times 356.4 }{1.99}\\\\\\~~~~~~~~~~\approx 2.68~ \text{L.}\\\\\\[/tex]
[tex]\text{Hence the volume of the gas is 2.68 L.}[/tex]
2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.
What is volume?A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the size of a container is typically thought of as its capacity, or the quantity of liquid it could hold.
Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes. If a formula again for shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes.
P×V = n×R×T
V=n×R×T /P
=0.182 ×0.082×356.4 /1.99
=2.68L
Therefore, 2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.
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density is ______ to pressure
Answer:
When pressure increases, density increases.
When the pressure decreases, density decreases.
When density increases, pressure increases.
When density decreases, the pressure decreases.
Explanation:
question -What happens to the energy of a wave if the amplitude of the wave is doubled?
The energy carried by the waves depends on the amplitude of the wave. If the amplitude is doubled then the energy gets increased by four times.
What is amplitude?The amplitude of a wave is the distance from the center line to the trough or the crest of the wave. The energy of the wave is directly proportional to the square of the amplitude.
E ∝ A²
So if the amplitude is doubled then E = 4. Hence, the energy gets increased quadruples times. The energy is related to the frequency and the wavelength of the wave that travels.
Therefore, the energy gets increased by four times if the amplitude is doubled.
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Which type of scientist would most likely study how electricity could be
produced more efficiently?
Electrical engineers are the scientists that study the production of electricity more efficient.
Which type of scientist would study how electricity could be produced more efficiently?
Electrical engineers are the type of scientist that would most likely study how electricity could be produced more efficiently because they produced new technologies which are cost efficient as well as produce high amount of electricity.
So we can conclude that electrical engineers are the scientists that study the production of electricity more efficient.
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The diagram below shows three kettles with their powers and the time they take to boil 500cm3 of water. How much energy is transferred (in kilojoules, kJ) by the 1.4kW kettle while it boils the water?
The energy transferred is given as the product of power and time. The 1.4 kW kettle with boiled water produces 378 kJ of energy.
What is energy?Energy is the quantitative property that determines the work done by the body in the form of heat and light.
The image showing the kettles with time and power is attached below.
Given,
Power of the kettle = 1.4 kW
Time taken = 4.5 minutes
If power = energy ÷ time
Then, energy = power × time
= 1.4 × 0.075
= 0.105 KWh
Therefore, 0.105 kWh or 378KJ is the energy transferred.
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How do you assume the help position to reduce heat loss in cold water?.
Crossing your arms across the chest and pulling the knees up to your chest is how the HELP position is achieved.
What is HELP position?This is referred to as heat escape lessening position and reduces heat loss in individuals when in cold water.
This position helps to protect groin, head/neck, and rib cage/armpits areas of the body.
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Which of the following is true for the equilibrium constant of a reaction? (5 pc
OIts value remains constant at different temperatures.
It is a ratio of coefficients of reactants to products.
It is represented by the symbol K.
Its value is always less than 1.
The equilibrium constant of the reaction is represented by the symbol K. Thus, option C is the correct and accurate statement about the equilibrium constant.
What is the equilibrium constant?The equilibrium constant is a representation of the concentration of the products and the reactants of the reaction that is raised to the powers through their stoichiometry coefficient.
Its value varies and changes at different temperatures and is not always less than 1. The equilibrium constant is the ratio of the coefficient of the products to reactants.
Therefore, option C. equilibrium constant is represented by K is true.
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Below is the thermochemical equation for the combustion of octane.
SC8H18(l) + 25O2(g) ⇒ 16CO2 (g) + 18H2O(l), ΔH= -10,941kj
How much heat is released during the combustion of 4 moles of octane (C8H18)
Question 5 options:
-21,882 kJ
-175,056 kJ
-2,735 kJ
-10,941 kJ
Impossible to answer this question with the information provided
-5,470.5 kJ
5mol produces -10.941KJ
4 mol let produces x KJ
Solve through proportion
5/-10.941=4/x5x=-43.764x=-43.764/5x=8.756 KJ5moles of octane produces -10941KJ
1mol of octane produces 2188KJ
4mol of octane produces
2188(4)8756KJ
groundwater is an important resource for all life on earth. as you have read, water levels in the ogallala aquifer are decreasing. one proposed
strategy mentioned in the article is to dig deeper wells. do you agree or disagree with this strategy? use evidence and scientific reasoning to
support your position
Digging of wells being able to increase aquifer is something I agree with.
What is an Aquifer?
This is a water permeable rock layer which is found in the underground layer of the earth.
Wells will ensure water seeps into these layers thereby bringing about an increase in the aquifer.
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How do you know which element the little number (subscript) goes with?
Answer:
you will not
Explanation:
the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.
there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1
Answer:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.
During a reaction, the enthalpy of formation of an intermediate is 34 kJ/mol. During the reaction, 4 moles of the intermediate are produced. What is the enthalpy value for this step of the reaction?
The enthalpy change for the formation step of this intermediate is 136 kJ/mol.
What is the enthalpy?The enthalpy of reaction can be obtained from the enthalpies of formation of the species involved. The enthalpy of reaction is the heat evolved or absorbed in a reaction.
Thus, the enthalpy change for the formation step of this intermediate is 4 * 34 kJ/mol = 136 kJ/mol.
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