Answer;Part A:
To find the standard enthalpy change for the reaction:
C(s) + CO2(g) → 2CO(g)
We need to use the standard enthalpies of formation for each of the compounds involved, which can be found in Appendix B of the textbook:
C(s): ΔH°f = 0 kJ/mol
CO2(g): ΔH°f = -393.5 kJ/mol
CO(g): ΔH°f = -110.5 kJ/mol
Using the equation:
ΔH°rxn = ΣΔH°f(products) - ΣΔH°f(reactants)
we can calculate the standard enthalpy change for the reaction:
ΔH°rxn = 2(ΔH°f[CO]) - ΔH°f[CO2] - ΔH°f[C]
ΔH°rxn = 2(-110.5 kJ/mol) - (-393.5 kJ/mol) - 0 kJ/mol
ΔH°rxn = -283.0 kJ/mol
Therefore, the standard enthalpy change for the reaction is -283.0 kJ/mol.
Part B:
To find the standard enthalpy change for the reaction:
2H2O2(aq) → 2H2O(l) + O2(g)
We can use the standard enthalpies of formation for each of the compounds involved, which can be found in Appendix B of the textbook:
H2O2(aq): ΔH°f = -187.8 kJ/mol
H2O(l): ΔH°f = -285.8 kJ/mol
O2(g): ΔH°f = 0 kJ/mol
Using the equation:
ΔH°rxn = ΣΔH°f(products) - ΣΔH°f(reactants)
we can calculate the standard enthalpy change for the reaction:
ΔH°rxn = 2(ΔH°f[H2O(l)]) + ΔH°f[O2(g)] - 2(ΔH°f[H2O2(aq)])
ΔH°rxn = 2(-285.8 kJ/mol) + 0 kJ/mol - 2(-187.8 kJ/mol)
ΔH°rxn = -196.4 kJ/mol
Therefore, the standard enthalpy change for the reaction is -196.4 kJ/mol.
Part C:
To find the standard enthalpy change for the reaction:
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
We can use the standard enthalpies of formation for each of the compounds involved, which can be found in Appendix B of the textbook:
Fe2O3(s): ΔH°f = -824.2 kJ/mol
CO(g): ΔH°f = -110.5 kJ/mol
Fe(s): ΔH°f = 0 kJ/mol
CO2(g): ΔH°f = -393.5 kJ/mol
Using the equation:
ΔH°rxn = ΣΔH°f(products) - ΣΔH°f(reactants)
we can calculate the standard enthalpy change for the reaction:
ΔH°rxn = 2(ΔH°f[Fe(s)]) + 3(ΔH°f[CO2(g)]) - (ΔH°f[Fe2O3(s)] + 3(ΔH°f[CO
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Find the amount of water containing 14.02 * 10²⁴ molecules
Answer:
14.02 x 10²⁴ molecules
Explanation:
To solve this problem we will use Avogadro's number: It relates to the number of molecules (or atoms) contained in 1 mol of any given substance:
14.02 x 10²⁴ molecules ÷ 6.023 x 10²³ molecules/mol = 23.28 molesThus, 23.28 moles of water contain 14.02 x 10²⁴ molecules.
industrial gases cause acid rain why
because the industrial gas is very harmful for us it is made up chemical and toxic gases
Answer:
The usual culprit is burning coal.
Explanation:
This produces a lot of carbon dioxide as well as sulphur dioxide. Other industrial processes, and vehicle emissions, produce similar oxides unless they are 'scrubbed' out. They react with atmospheric moisture to produce acids like carbonic, sulphurous and nitrous acids. Which is then precipitated. It should be remembered that a volcanic eruption has this effect too.
What is the difference between an empirical formula and a molecular formula?
Answer:
The empirical formula simply states the ratios of the elements that make up the molecule, while molecular formulas specify the amounts of each element exactly, not just giving the ratio. Let's take ethane (C2H6) as an example.
The density of water H20 is bout 1 g/ml. If u have a bottled water that is 500 ml how many grams is this
Answer:
500 grams
Explanation:
500 milliliters x 1 gram per millileter = 500 grams.
What is the proper name for the chemical formula Cl4O5?
Answer:
Carbon tetraiodide
Explanation:
let me know if it works
Choose the formula for calculating percent composition.
Answer:
The equation for percent composition is (mass of element/molecular mass) x 100.
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How many atoms would you find in 3.60 g of Boron?
Answer:
1.8 * 10^24 atoms
Explanation:
n = M(B) / m = 10.8 / 3.60 = 3 mol
N = n * Na = 3 * 6*10^23 = 1.8 * 10^24 atoms
Can someone please explain to me what a Ecologist does for a living? (Or daily in their career?)
ecologists look at relationships between nature, studying the interactions between humans, animal and plants.
Answer:
Ecologists focus on the relationship of organisms within their environment. Ecology is a branch of biology (biology is the study of life). Given the broad scope of ecology, there are multiple sub-disciplines that an ecologist can choose to focus on. Since all living things (plants, animals, microbes) depend on other living things and a healthy environment to survive, ecologists may specialize in one aspect of an ecosystem. Examples include terrestrial (land), aquatic (water), applied (concepts and principles of ecology), conversation (management of biodiversity), and evolutionary (evolution).
Explanation:
Brainliest plz
Please help
according to the ____ rule, elements tend to react until they have the same electron configuration as a _____. _____, found on the left of the _____, tend to lose electrons and from ____. _____ tend gain electrons to form _____.
Answer:
What chapter is this and what grade are you, i can check this for you
Explanation:
how much empty space was there in the medium-sized rock sample
Answer:
I'm assuming this is from a lab that you did - in which case, I can't really help you out here.
Explanation:
What is the acceleration due to gravity at Earth's surface?
Answer:
9.8 m/s2
Explanation:
That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2.
1 pt
Vanadium (V) is element 23 on the periodic table. A sample contains 2.88x1022 atoms of V. Calculate the amount of V.
1 pt
x mol V
1 pt
Resubmit
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which statement best explains why chlorine is added to drinking water? A. Chlorine cures infections caused by bacteria or other microorganisms B. Chlorine protects people teeth against cavities C. Chlorine prepares the body to fight future infections D. Chlorine kills most pathogens in water
Answer:
to protect peoples teeth against cavities
Explanation:
i just know
Answer: its D
Explanation: A.P.E.X.
If you tested two samples of a particular pure substance, what would you find?
Answer:
The properties of a pure substance can be used to determine whether a sample is a pure substance or mixture because the characteristic properties of matter can be used to identify a sample. The result is a mixture called a composite.
Explanation:
Pure substances contains their own molecules only and not any impurity. Thus, when we tested it only shows the properties of its own.
What are pure substances?Pure substances are substances containing its pure composition without any impurities. For example water, fruits, acids etc. are pure substances and they does not have a combination other substances.
Mixtures are the combination of two or more pure substances, and the can be heterogenous or homogenous. Whereas, pure substances homogenous only thus forming only one phase.
When we tested mixtures qualitatively, they shows the properties of each individual components in it. Whereas, pure substances give inly its own characteristics.
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What does it mean if a solution is a "weak acid "? Strong acid? Give logical ph values for each
Answer:
A weak acid is an acid that partially dissociates into its ions in an aqueous solution or water. In contrast, a strong acid fully dissociates into its ions in water. At the same concentration, weak acids have a higher pH value than strong acids.
Explanation:
:)
Why are the elements in group VIIIA unreactive?
They are all gases.
They have an even number of electrons in their outer shell.
They have a full outer shell of electrons.
They each have a stable nucleus.
Which phrases describe the oceans? Check all that apply.
cover more than 70 percent of Earth
provide oxygen for life on Earth
contain fresh water
constantly in motion
interact with other Earth systemsWhich was found to be unconstitutional based on the Supreme Court’s ruling in Scott v. Sandford?
Answer:
the first one is the answer
Answer:
Phrases that describe the oceans are
cover more than 70 percent of Earth
constantly in motion
interact with other Earth systems
Explanation:
What are the two most important properties of ocean water?
Two of the most important characteristics of ocean water are its temperature and salinity.
How many electrons are needed in the outer energy levels of most atoms to be chemically stable?
Answer:
8 electrons
Explanation:
What type of weathering occurs when acid rain changes rocks? A. erosion
B. deposition C. chemical weathering D. physical weathering
Answer:
c...................................
A 4 feet tall student went summing pool. He saw depth of water in pool less than 4 feet.Will he drowned.Write reason
Answer:
Question says , the height of the student = 4 feet, ... This means, if the student goes for swimming in the pool, however he does not know swimming, he will not be drowned until he is suffering from an injury or external force.
what is an accurate description of a period in the periodic table
Answer:
The periods of the periodic table are the horizontal rows.
Explanation:
Answer:
period is a horizontal row of the periodic table
Explanation:
A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor
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PLEASE HELP ME !!!!
The octet rule states that atoms tend to form bonds so that each atom has eight ________ in its _______
shell
Answer:
electrons..............
Answer:
electrons, outer
Explanation:
Which type of cell is associated with the statements below? Fill in the blank with either (voltaic cell, electrolytic cell, both).
Non-spontaneous reaction occurs:
Spontaneous reaction occurs:
Oxidation occurs at anode:
Electrolyte supports electron flow:
Answer:
Non-spontaneous reaction occurs: electrolytic cell.
Spontaneous reaction occurs: voltaic cell
Oxidation occurs at anode: both
Electrolyte supports electron flow: both
Explanation:
PLS HELP 6TH GRADE ITS ONE QUESTION ABOUT SCIENCE
Answer: The answer is C
Explanation:
Your answer would be C. :)
Which statement about copper, diamond, and silicon(IV) dioxide is correcta)Copper and silicon(IV) dioxide have similar electrical conductivityb)In diamond the carbon atoms are covalently bonded as flat sheetsc)In silicon(IV)dioxide the silicon and oxygen atoms are covalently bonded in flat sheetsd)The structure of copper includes a lattice of positive ions
Answer:
In diamond the carbon atoms are covalently bonded as flat sheets
In silicon(IV) dioxide the silicon and oxygen atoms are covalently bonded in flat sheets
The structure of copper includes a lattice of positive ions
Explanation:
Diamond and silicon(IV) dioxide are covalent network solids. Covalent network solids are made up of atoms joined to one another by covalent bonds to form a giant lattice, The solids are hard and have a very high melting point. They do not conduct electricity. So, for both diamond and SiO2, atoms are covalently bonded to yield flat sheets in a covalent bonded network solid.
Copper is a metallic substance having metallic bonds, a metallic crystal consists of positive ions and a cloud of electrons.
Given a 6.80 g sample of H2O how many grams of oxygen is produced assuming the decomposition goes to completion
Answer:
6.0444g
the formula must be after balancingknown as 36(mass) of H2O can produce 32(mass) of O2so 6.80g of H2O can produce (x)g of oxygenAccording to the stoichiometry of the decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
What is stoichiometry?Stoichiometry is defined as the determination of proportions of elements or compounds which are present in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.According to the reaction, 36 g water gives 32 g oxygen thus 6.80 g water will give 6.80×32/36=6.04 g.
Thus, on decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
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What type of heat transfer causes the water in the bottom of the pool to be cooler and the water at the top to be warm?
Answer:
i think its convection
Explanation:
1. How many moles does 24 g of Mg contain?
Explanation:
1 mole Of atom = GAM
MG=24g
GAM of Mg=24g
Therefore 24g=mole
Not My answer But I saw That You needed it.
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biology and physics are so closely related that sometimes the fields overlap. what experiment might both biologist and physicists do
Answer:
Study how the body's nerve cells react to an electrical shock.
Explanation:
Answer:
Study how the body's nerve cells react to an electrical shock.
Explanation:
a p ec
Plants cells also gain energy through cellular respiration.
True or false?
Answer:
true
Explanation: