The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C8H18(l) + 12.5O2(g) arrwo 8CO2(g) + 9H2O(g).
What is the enthalpy of formation for this reaction?
16CO2(g) + 18H2O(g) arrow 2C8H18(l) + 25O2(g)
The enthalpy change for reaction (2) is 10178 kJ/mol.
What is enthalpy of reaction?
The term enthalpy of reaction has to do with the heat that is evolved or absobed in a chemical reaction.
We have the equations;
C8H18(l) + 12.5O2(g) -----> 8CO2(g) + 9H2O(g).16CO2(g) + 18H2O(g) ----->2C8H18(l) + 25O2(g)We can see that equation (2) is obtained from (1) by multiplication using a factor of 2. and also (2) is a reverse of (1). It then follows that the enthalpy change for reaction (2) is 10178 kJ/mol.
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Answer:
10,148 kJ
Explanation:
This is the stable structure on which the microscope firmly rest. *
Answer:
Explanation:
As far as the function of the microscope is concerned, they play the most important role. ... These are parts that support the microscope and the object being examined. Base. This is the stable structure on which the microscope firmly rests.
6. Model conservation of mass in a labeled drawing that illustrates a physical change.
Answer:
hope it's help you
Explanation:
In an isolated system, neither chemical processes nor physical changes can create or destroy mass, according to the principle of mass conservation. According to the law of conservation of mass, the mass of the products and reactants of a chemical reaction must be equal.
Why is mass conservation crucial?According to the law of conservation of mass, matter cannot be created or destroyed in a chemical reaction. When wood burns, for example, the mass of the soot, ashes, and gases equals the original mass of the charcoal and oxygen when it first reacted. As a result, the product's mass equals the reactant's mass. The understanding that substances do not, contrary to appearances, vanish as a result of a reaction, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry. The law of conservation of mass does not always apply.To learn more about mass conservation refer to:
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how does the path of the moon in the sky vary throughout the year
Answer: your answer
Explanation: The Moon follows generally the same path, but with some important differences. The Moon's orbit is tilted 5.1° relative to the ecliptic. So, the Moon can appear anywhere in a band extending 5.1° north (above) and south (below) of the ecliptic. Each month, the Moon twice crosses the ecliptic on opposite sides of Earth
When burning a campfire, how would the mass of the products of burning (ash, soot, etc.) compare to the mass of the wood and oxygen that were used during the burning?
A
the masses would be different
B
the masses would be the same
Answer:
A because this different
Answer:
B
Explanation:
the masses would be equal to the burning (ash, soot, etc.) to the wood and oxygen that were used during the burning since the law of conservation of mass says that matter can not be destroyed nor created.
explain why copper metal cannot be used to prepare hydrogen gas
1. Which property measures the space taken up by an object?
A hardness
B mass
C. volume
D. weight
An engineer is investigating the ways in which electroplating is currently
done. This is an example of which step in the engineering process?
Answer:
Background research
Explanation:
Why do you have to have a certain number of reactants on one side?
Answer:Because you need that certain number and double the number of bread to get the reactants off of the sides
Explanation: 4 bread reactants- 2meat reactants- 2 cheese reactants= 2 products
The reason for the presence of a certain number of reactants on one side is to ensure that the chemical equation is balanced.
In a balanced chemical equation, the number of atoms of each element on the reactant side must be equal to the number of atoms of that element on the product side.
Consider the equation:
[tex]2H_2 + O_2 - > 2H_2O.[/tex]
This equation represents the reaction of hydrogen gas ([tex]H_2[/tex]) with oxygen gas ([tex]O_2[/tex]) to form water ([tex]H_2O[/tex]).
To balance this equation, double the coefficient in front of [tex]H_2O[/tex] on the product side, resulting in 4 hydrogen atoms and 2 oxygen atoms on both sides.
Therefore, having a certain number of reactants on one side is necessary to ensure that a chemical equation is balanced, satisfying the law of conservation of mass.
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how many sodium atoms are present in 0.2310 g of sodium?
Answer:
There are 6.048X10^21 atoms present in 0.2310 g of sodium.
Explanation:
We know,
23g Na contains 6.022X10^23 atoms
∴1g Na contains 6.022X10^23/23 atoms
So, 0.2310g Na contains (6.022X10^23/23)X0.2310 atoms
= 6.048X10^21 atoms
There are 6.048X10^21 atoms present in 0.2310 g of sodium.
The number of atoms present in 0.231 g of sodium is 6.02 x 10²¹ atoms.
The given parameters;
mass of the reacting sodium = 0.231 g1 mole of an atom = 6.02 x 10²³ atomsthe atomic mass of sodium is 23 g/molThe number of moles of 0.231 g of sodium available is calculated as;
[tex]no. \ of \ moles = \frac{Reacting \ mass}{Molar \ mass} \\\\no. \ of \ moles = \frac{0.231}{23} \\\\no. \ of \ moles = 0.01 \ mol.[/tex]
The number of atoms of 0.01 mole of sodium available is calculated as;
1 mole ---------- 6.02 x 10²³ atoms
0.01 ----------------- ?
= 0.01 x 6.02 x 10²³ atoms
= 6.02 x 10²¹ atoms.
Thus, the number of atoms present in 0.231 g of sodium is 6.02 x 10²¹ atoms.
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In the compound nitric oxide (NO), for every 14 grams of nitrogen (N),
there are how many grams of oxygen (O)?
a. 16
b. 8
C.14
Answer:
b
Explanation:
answer is b hope helpful
What does the enthalpy of reaction measure?
Answer:The amount of energy used or released as heat in a reaction.
Explanation:
Define physical and chemical properties, provide three examples of each, DISCUSS THEIR REVERS ABILITIES, and
explain the fundamental differences between them.
I really need the reverse abilities.
Explanation:
the physical and chemical has different meaning
and the three examples are to discuss, reverse
and the ability.and to reverse the ability is to provide
the physical and chemical definement.
Which term describes the materials magma is made of?
A. Extrusive
B. Intrusive
C. Molten
D. Cooled
Answer:
molten hi i eat apples and bananas
compare the temperature and thermal energy of hot soup in a small mug and that of hot soup in a large bowl
Explanation:
Both have the same temperature, but the large bowl of soup has more thermal energy than the small mug because there is more matter present in the bowl.
The temperature of both the bowl is same , but the thermal energy of large bowl is more than the thermal energy of small bowl.
What is thermal energy?Thermal energy is defined as the energy of an object or system due to the movement of its molecules and atoms. It is produced with rise in temperature.
It is also defined as internal energy present in a system in the state of thermodynamic equilibrium by virtue of its temperature.
Thermal energy is also known as heat energy.
Thermal energy is directly proportional to mass of the object.
Thermal energy sources include natural gas, coal, and oil, as well as solar, heat pump electric, and geothermal heat.
Thus, the temperature of both the bowl is same , but the thermal energy of large bowl is more than the thermal energy of small bowl.
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How many of each type of atom would there be if this water molecule underwent electrolysis?
There would be two atoms of hydrogen and one atom of oxygen. Electrolysis involves decomposition of substances by direct current.
Electrolysis is a process by which a liquid is decomposed by the passage of direct current through it.
Water is composed of hydrogen and oxygen in a ratio of 2:1. Hence, when water molecule is decomposed in electrolysis, two atoms of hydrogen and one atom of oxygen is obtained.
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Which organisms use cellular respiration as a way to convert energy into usable form?
seedless plants only
only photosynthetic organisms
only mammals
all organisms
I'm sorry I meant all organisms
what's going to be in the he World
Answer:
Lots of people set the alarm with the best of intentions, knowing that's the time they need to get up to meet the day's demands. But then the alarm clock seems to ring way before they're ready to rise, so they're hitting snooze and, eventually, running late. Something's got to give.
The key lies inside your body. "An important factor in being able to wake up easily at the desired time in the morning is the timing of one's circadian rhythm, or 'body clock,'" says sleep researcher Leon C. Lack, PhD, professor emeritus in the school of psychology at Flinders University in Adelaide, Australia. Much of what you need to do to wake up on time starts by planning your sleep schedule the day and the evening before — and by making your mornings count.
How do our internal clocks work, and how much can we control them? According to the National Institutes of General Medical Sciences (NIGMS), the body’s master clock, located in the brain, produces and regulates our circadian rhythms, which help determine sleep patterns over the course of a 24 hour period. Environmental signals, such as daylight and darkness, affect circadian rhythms, too. When incoming light hits the optic nerves, information is passed along from the eyes to the brain. When there is little or no light — at night — your clock tells the brain to make more melatonin, a hormone which makes you sleepy.
Our sleep-wake cycles, hormone levels, metabolism, and body temperature are all affected by our circadian rhythms, notes the National Institute of Neurological Disorders and Stroke. When your rhythm is off, you may be at risk for more than just a few groggy days you drag yourself through. Irregular rhythms, the NIGMS notes, have been linked to chronic health conditions, such as obesity, diabetes, depression, bipolar disorder, and seasonal affective disorder.
But there are ways to recalibrate your system to get the sleep you need and wake up feeling refreshed and ready for the day ahead. Physiological and psychological factors come into play, and it’s not always easy to get a good night’s rest or adhere to a schedule so that you consistently go to sleep and get up around the same time each day.
is going on
It refers to a group of cells which perform essentially the same function. *
Answer:
Tissue
Explanation:
A Group of cells which perform thesame function according to the organization of life is called Tissue
SpongeBob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He brought a special Flower Power fertilizer to see if it will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and waters it with plain water every other day.
What did SpongeBob do wrong in this experiment? Explain.
How could SpongeBob improve his experiment?
Answer: He had more than one independent variable.
Explanation: It would only be fair, if both plants were in a sunny window, because then, it would be easier to see if the fertilizer actually affected the plants. This is because there is always a chance that the lack of sunlight decreased the number of flowers on the plant, instead of the fertilizer. It is always better to just have one independent variable.
1. How many grams of CuNO, are required to produce 700.0 mL of a 2.0 M CUNO,
solution?
a) 175 g
b) 87.7 g
c) 43.8 g
d) 117 g
e) 1.50 g
Answer:
b
Explanation:
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have a great day
Suppose you wanted to use a graphical method to find the number of miles your car can travel on a
gallon of gasoline. Briefly describe a procedure you could use.
someone pls answer asap i don’t care if the answer isn’t that good i’ll give lots of points
Answer:
I think its use a Acceleration to speed up
What force of attraction pulls everything towards Earth's center?
Answer:
Gravity is the force that pulls all objects in the universe toward each other. On Earth, gravity pulls all objects "downward" toward the center of the planet.
Explanation:
Answer:
Gravity
Explanation:
The force of gravity pulls everything toward the Earth.
Tổng số hạt p,n,e của hai nguyên tử A và B là 142. Số hạt mang điện nhiều hơn hạt không mang điện là 42, số hạt mang điện của B nhiều hơn A là 12. Tính số p,n,e của mỗi nguyên tử A và B
Answer:
language
Explanation:
Someone pls tell me the cm and mm
Explanation:
Answer is 1 CM 3MM
AND YOU CAN ANSWER AS 1.3
Explain how a true acid wave, with a pH below 7.0, can cause the hair to swell.
Answer:
Services raise the pH in the hair to a alkaline state in order to soften and swell the hair shaft. Disulfide, hydrogen, salt. Side bonds are responsible for the strength and elasticity of the hair. Altering these is what make wet setting, thermal styling, permanent waving, curl reforming, and relaxing possible
A pH of 7 is neutral, a pH below 7 is acidic, and pH above 7 is alkaline. ... Chemical Texturizers raise the pH of the hair to an alkaline state in order to soften and swell the hair shaft. This action lifts the cuticle layer, and allows the solution to reach the cortex layer where restructuring takes place.
Explanation:
PLEAse HELP MEEEE ASAPPP
When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2K(s) + 2H20m - 2KOH(aq) + H2(g)- Your lab partner says this is a redox reaction and a combustion reaction. Do you agree? Defend your answer by explaining whether or not it meets the requirements of each type of reaction.
Answer:
Chemical Reaction:In the given reaction potassium metal is placed in water and when a reactive metal is placed in water, it reacts with water to form metal hydroxide and hydrogen gas, as a result, potassium hydroxide and hydrogen gas are produced in the reaction. A redox reaction is a reaction in which a substance is oxidized during the reaction whereas some other substance is reduced during the reaction, simultaneously.
Explanation:
correct me nlng kung mali.
This is the question pls help me
Answer: B
Explanation: Graph B compares the two temperatures on separate lines so that we can see the comoparison directly, as a function of time. Not only does the graph quickly answer which condition id most favorable to colony growth, but it also hints at some behaviors that may accelerate growth as time goes on. Graph C is a possible answer, if the only question is which promotes growth the fastest. But the questions asks "compare," which Graph B does not allow as well as Graph C.
Write a balanced molecular equation describing each of the following chemical reactions:
Solid calcium carbonate is heated and decomposes to solid calcium oxide and carbon dioxide gas.
Answer: CaCO3 = CaO + CO2
Explanation:
CaCO3 = CaO + CO2
This is balanced already.
Elem Reactant Products
Ca 1 1
C 1 1
O 3 3
Write the empirical formula of at least four binary iconic compounds that could be formed from the following ions:
Zn^2+,Fe^2+,I^-, S^2-
Explanation:
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