Answer:
The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun
Answer:
Rotation of the Earth.
As the Earth rotates, places on Earth get farther from the Sun and make seasons.
which source is most likely an authority on the subject
Answer:
Dr. Patel, a cardiologist, presents her findings on heart disease
Explanation:
In plants, carbon dioxide and water combine to form glucose and oxygen. This process is known as photosynthesis.
Which of the following is the balanced equation for this process?
A.
B.
C.
D.
Answer:
Explanation:
Since the equation is not given, let us write and balance it:
Reactants: Carbon dioxide (CO₂)
Water(H₂O)
Products: Glucose(C₆H₁₂O₆)
Oxygen(O₂)
The reaction equation is shown below:
CO₂ + H₂O → C₆H₁₂O₆ + O₂
But the equation is not balanced:
to balance the equation
aCO₂ + bH₂O → cC₆H₁₂O₆ + dO₂
for C:
a = 6c, if c = 1 then a = 6
for O:
2a + b = 6c + 2d
for H:
2b = 12c, since c = 1, b = 6
In 2a + b = 6c + 2d, solving for d:
2(6) + 6 = 6(1) + 2d
18 = 6 + 2d
d = 6
Therefore, the balanced equation is:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Photosynthesis is the process where six molecules of carbon dioxide and six molecules of water combine, using light energy, to produce one molecule of glucose and six molecules of oxygen. This procedure is unique to plant cells and fosters life as we know it on Earth.
Explanation:The process you're referring to is indeed called photosynthesis and this process happens in cells of plants, which absorb sunlight to carry out this operation. The balanced equation for photosynthesis is written as:
6CO₂ + 6H₂O -------light------> C₆H₁₂O₆ + 6O₂
In other words, this equation reads: Six molecules of carbon dioxide plus six molecules of water, using light energy, produce one molecule of glucose and six molecules of oxygen. This procedure, which can only be completed by plant cells, enhances life on Earth as we know it.
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Which of these indicates that a liquid has transferred thermal energy to the air?
D
Temperature is equivalent to kinetic energy under the collision theory of matter. This shows that losing kinetic energy to the air (a "transfer" of thermal energy) is the same as a decreasing temperature.
Answer:
D
Explanation:
Construct a pair of conversion factors that relate moles of S to moles of Al2 (SO4)3.
Explanation:
First conversion factor: moles of SO₄ per mole of Al₂(SO₄)₃.
3 mol SO₄ / mol Al₂(SO₄)₃
Second conversion factor: moles of S per mole of SO₄.
1 mol S / mol SO₄
Altogether:
(3 mol SO₄ / mol Al₂(SO₄)₃) × (1 mol S / mol SO₄) = 3 mol S / mol Al₂(SO₄)₃
To relate moles of S to moles of Al2(SO4)3, we use the compound's 2:3 ratio to establish that 1 mole of Al2(SO4)3 has 3 moles of S. Conversion factors are 1 mole Al2(SO4)3/3 moles S and 3 moles S/1 mole Al2(SO4)3. These allow for conversions between the moles of the two substances.
Explanation:To construct a pair of conversion factors that relate moles of S to moles of Al2(SO4)3, we need to look at the chemical compound's formula. The compound aluminum sulfate, Al2(SO4)3, shows there are three sulfate (SO42-) ions for every two aluminum (Al3+) ions.
This indicates a 2:3 ratio between Al and SO4 in the compound. Each sulfate ion contains one atom of sulfur (S), so for every mole of Al2(SO4)3, there are three moles of sulfur atoms (S). Thereby, the conversion factors are:
1 mole Al2(SO4)3 / 3 moles S3 moles S / 1 mole Al2(SO4)3These factors can be used to convert moles of sulfur to moles of aluminum sulfate and vice versa.
7. A reaction that has oxygen as a reactant and usually has carbon dioxide and water as products
is a ______ reaction?
Answer:
Explanation:
Such a reaction used to be called a hydrocarbon burning reaction. For example, the burning of gasoline (octane) looks like this.
C8H18 + 13.5 O2 ===> 8CO2 + 9H2O
which pure substance will not conduct electricity ?
1.liquified HCL
2.molten. NaCl
3. molten KOH
4.liquid Na
The answer is answer choice 3
if molar mass of Na2SO4xnH2O is 304.04 mol/g, what is the hydration number of n
Answer:
n = 9
Explanation:
Given parameters:
Molar mass of Na₂SO₄.nH₂O = 304.04gmol⁻¹
Solution
To find the hydration number n, we simply express atomic masses of the atoms in the compound as equal to the given molar mass.
Atomic mass of Na = 23g
S = 32g
O = 16g
H = 1g
Molar mass of the compound is evaluated as:
2(23) + 32 + 4(16) + n[2(1) + 16] = 304.04
46 + 32 + 64 + 18n = 304.04
142 + 18n = 304.04
18n = 304.04 - 142
18n = 162.04
n = 9
Which of the following is not among the three likely sources of heat during the formation of the Earth?
Answer:
Constant volcanic eruption
Explanation:
Noble gases are found as monatomic molecules
Answer:
nobel gass are found atmosphere
Answer:
Noble gases are found as monatomic molecules is a TRUE statement.
Explanation:
Noble gases are monoatomic elements. That is they exist as a single atom in nature.
Noble gases are the only elements which are stable at room temperature and pressure.
Except helium which has 2 valence electrons all other elements have 8 valence electrons (electrons in the outer shell) This is the reason why the noble gases are non reactive that is they are inert in nature.
It is difficult to oxidize or reduce noble gases and hence they form very few compounds.
_____ numbers are based on the distribution of electrons in a molecule.
Question 4 options:
coefficient
oxidation
electron
chemical
Answer:
oxidation
Explanation:
oxidation number are based on the distribution of electrons in a molecule
Fill in the blanks to complete each statement about weathering
Weathering is the breakdown of rocks into smaller particles called
weathering is when rocks are physically broken into smaller pieces, but the minerals in
the rock remain the same.
When a rock is broken down in a way that changes the mineral composition, it is called
weathering
Answer:
Weathering is the breakdown of rocks into smaller particles called sediment (not sediments)
Mechanical weathering is when rocks are physically broken into smaller pieces, but the minerals in the rock remain the same
When a rock is broken down in a way that changes the mineral composition, it is called Chemical Weathering.
The blanks about Weathering in the question are filled as follows;
SedimentSedimentMechanical/PhysicalSedimentMechanical/PhysicalChemicalAccording to the question;
We are required to fill in the blanks to complete each statement about Weathering.For Statement 1:
Weathering is the breakdown of rocks into smaller particles called Sediment.For Statement 2;
When rocks are physically broken into smaller pieces, but the minerals inthe rock remain the same, Such kind of weathering is termed Mechanical/physical weathering.For Statement 3:
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What type of bond forms between two oxygen atoms?
a. nonpolar covalent
b. ionic
c. metallic
d. polar covalent
Answer:
A double covalent bond.
Explanation:
A double covalent bond forms between two oxygen atoms.
A double covalent bond is when two pairs of electrons are shared between the atom. Usually, there is only one pair, rather than two pairs.
The electrostatic attractive interaction between the same or different elements is called bonds. A nonpolar covalent is formed between two oxygen atoms. Thus, option a is correct.
What is a covalent bond?A chemical bond that involves the mutual sharing of electrons between the outer valence shell of the elemental atom is called a covalent bond. The covalent bonds are of two types namely polar and non-polar.
The polar covalent bond is the unequal sharing of the electrons in the outer shell due to differences in electronegativities. The non-polar covalent bond is formed between the same or different elements in a compound.
In a non-polar covalent bond like two oxygen atoms, the valence electrons are shared equally and have negligible electronegativity differences.
Therefore, option a. two oxygen atoms form a nonpolar covalent.
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9. Matter is anything that
Ms
O A. has mass and takes up space.
O B. is important to human society.
O C. has only one physical state
O D. contains two elements combined chemically
Mark for review (Will be highlighted on the review page)
de Previous Question
Neyt
as
Is C6H12O6 organic or inorganic? Explain.
Answer:
Organic
Explanation:
Glucose is an organic compound, as its structure contains atoms of carbon, which are the main constituents of organic molecules. Glucose is specifically a monosaccharide that belongs to the group of carbohydrates, one of the four types of organic molecules.
C6H12O6 is an organic compound because it contains carbon in its structure.
Explanation:Organic compounds are carbon-based molecules, essential to life and diverse in structure. They include hydrocarbons like methane, functional groups like alcohols, and complex biomolecules such as proteins and DNA. Organic chemistry studies their synthesis, structure, and properties, playing a crucial role in pharmaceuticals, agriculture, and materials science
In the given case C6H12O6 is an organic compound as organic compounds are defined as covalently bonded compounds containing carbon, excluding carbonates and oxides. C6H12O6 is composed of carbon (C), hydrogen (H), and oxygen (O) atoms, making it an organic compound.
which type of fossils is formed by sediments and found in sedimentary rock
Answer:
Among the three major types of rock, fossils are most commonly found in sedimentary rock. Unlike most igneous and metamorphic rocks, sedimentary rocks form at temperatures and pressures that do not destroy fossil remnants. Often these fossils may only be visible under magnification.
Explanation:
find the midpoint of a segment with endpoints of 4-3i and -2+7i
Answer:
1+2i
Explanation:
Answer:
1+2i
Explanation:
Let the two complex numbers in the question to be as shown below,
a + bi = 4 − 3i and s + ti = -2 + 7i.
Apply the Midpoint Formula for the 2 complex numbers which are a + bi and s + ti is:
[tex]Midpoint=\frac {a+s}{2}+ \frac {b+t}{2}i[/tex]
Applying values as:
[tex]Midpoint=\frac {4-2}{2}+ \frac {-3+7}{2}i[/tex]
Hence, the midpoint is 1+2i
5. The benzoate anion is the conjugate base of the benzoic acid. Potassium
benzoate forms a basic solution in water, so benzoic acid is a
A strong acid
B salt
c weak acid
D weak base
Answer: The benzoic acid is a weak acid.
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.A base is defined as a substance which accepts protons and thus forming conjugate acid.The chemical equation for the reaction of potassium benzoate with water follows:
[tex]C_6H_5COOK+H_2O\rightarrow C_6H_5COOH+KOH[/tex]
Here, benzoate anion is accepting a proton from water and is acting as conjugate base. Water is acting as conjugate acid.
The solution formed is basic solution because of the formation of potassium hydroxide.
When a strong base and weak acid reacts, it leads to the formation of basic solution.
Hence, the benzoic acid is a weak acid.
A conjugate base differs from the forming acid in that it has one additional negative charge and one fewer H atom. It is a material that remains after an acid loses its hydrogen ion. Here benzoic acid is a weak acid. The correct option is C.
Benzoic acid is a weak acid because it is an organic acid. The acid is more potent at higher proton-leaving rates. Because of its resonance structure, benzoic acid has a reduced ability to leave protons, which restricts its proton-leaving potential.
The chemical equation for the reaction of potassium benzoate with water follows:
C₆H₅COOK + H₂O → C₆H₅COOH + KOH
Here, the benzoate anion is accepting a proton from water and is acting as a conjugate base. Water is acting as conjugate acid. When a strong base and weak acid react, it leads to the formation of a basic solution.
Thus the correct option is C.
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If the average adult woman consumes approximately 2,000 kcal per day, how long would she need to run in order to utilize 25 percent of her caloric intake, given that the energy requirement for running is 42,000 J per minute?
Answer:
Explanation:
She would have about 21,000 back
A soft drink contains 11.5% sucrose (C12H22O11) by mass. How much sucrose, in grams, is contained in 355 mL (12 oz) of the soft drink? (Assume a density of 1.04 g/mL.)
Express your answer to three significant figures and include appropriate units.
Answer:
42.5 g
Explanation:
Calculate the mass of the soft drink given the density and volume:
355 mL × 1.04 g/mL = 369.2 g
Now calculate the mass of sucrose given the percentage:
0.115 × 369.2 g = 42.46 g
Rounded to 3 significant figures, the mass is 42.5 g.
Answer:
42.458 g of sucrose is contained in 355 mL (12 oz) of the soft drink
Explanation:
Volume of the soft drink = 355mL
Density = 1.04 g/mL
We know
Density = Mass / Volume
Rearranging the formula
Mass of soft drink = Density × volume
[tex]=1.04 g/mL \times 355mL=369.2 g[/tex]
[tex]Mass = \frac {(mass of solute)}{(mass of solution )} \times 100%[/tex]
[tex]11.5 = \frac {(mass of solute (sucrose))}{(mass of solution(soft drink) )} \times 100%[/tex]
[tex]11.5 = \frac {(mass of solute (sucrose))}{(369.2 g)} \times 100%[/tex]
So
Mass of sucrose
[tex]=\frac {(11.5 \times 369.2g)}{(100)}[/tex]
= 42.458 g is the Answer
Deposition is a _____ force since it involves dumping sediment in a particular location.
A. chemical
B. destructive
C. mechanical
D. constructive
Answer:
D) constructive
Explanation:
Deposition is a constructive force since it involves dumping sediment in a particular location.
Constructive is the correct answer. A deposition is a constructive force when it involves dumping into sediment a particular location. I hope this will help you. Have a wonderful day!
If a molecule has an empirical formula of C2H2O and a molecular mass of 84.0 g/mol, what is the molecular formula?
Answer:
=C₄H₄O₂
Explanation:
Given the empirical formula of a molecule, the he the quotient of the molecular mas and and the empirical mass=constant.
84.0 g/mol/mass of(C₂H₂O)=constant
=84/(12×2+1×2×16)
=84/42
=2
Therefore, the molecular formula is (C₂H₂O)₂=C₄H₄O₂
Answer:
[tex]C_2 H_2 O \times 2=C_4 H_4 O_2[/tex] is the molecular formula
Explanation:
Empirical formula is the simplest form of a Molecular formula.
For example
Molecular formula of glucose is [tex]C_6 H_{12} O_6[/tex]
Its empirical formula is [tex]C_1 H_2 O_1[/tex]
The subscript numbers of the molecular formula is divided by a common number n=6 here.
Another example:
Molecular formula of Octane is [tex]C_8 H_{18}[/tex] and Its empirical formula will be [tex]C_4 H_9[/tex]
Subscripts divided by n=2.
To find n we make use of the formula
[tex]\frac {(molecular mass )}{(empirical formula mass)}=n[/tex]
[tex]= \frac {84.0g}{(C_2H_2O mass)}\\\\=\frac {84.0g}{(24+2+16)g}=\frac {84.0g}{42g}=2[/tex]
So, we see n=2 here
Empirical formula × n = molecular formula
[tex]C_2 H_2 O \times 2=C_4 H_4 O_2[/tex] is the molecular formula
(Answer)
Please note:
Molar mass is the mass of 1 mole of the substance and its unit is g/mol .
n is the number of moles by which the empirical formula is multiplied to get the molecular formula of the compound.
what are some applications of fission reactions?
as a zero-waste energy source
Answer:
Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same. Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.
Explanation:
Final answer:
Nuclear fission is used primarily in nuclear reactors to generate electricity and in nuclear weapons. While it is more environmentally friendly than fossil fuels, it still produces radioactive waste, challenging the perception of it as a zero-waste energy source.
Explanation:
Applications of Fission Reactions
Nuclear fission reactions involve the splitting of a heavy atomic nucleus into two or more lighter nuclei, along with the release of energy and neutrons. This process is not only fundamental in nuclear power plants, where the energy released is harnessed to generate electricity, but also underlies the destructive power of nuclear weapons.
Nuclear reactors use controlled fission reactions to heat water, producing steam that drives turbines to generate electricity. This method of producing power is seen as a more environmentally friendly alternative to fossil fuels, as it does not produce greenhouse gases. Moreover, many countries see the development and application of nuclear technology as critical for ensuring energy security.
However, it is important to note that while nuclear power is seen as a potential solution to global warming, it is not a zero-waste energy source. The spent nuclear fuel and other radioactive waste generated by nuclear reactors pose significant disposal challenges.
A scientist realizes there was a significant increase in the number of deaths related to skin cancer last year. Which part of the engineering process is she most likely engaged in?
A) Knowing the background
B) Evaluating the results
C) Making a plan
D) Identifying a need
The part of the engineering process that she is most likely engaged in is identifying a need. Thus, the correct option is D.
What is Skin cancer?Skin cancer may be defined as the circumstance in which there is an uncontrolled growth of abnormal skin cells occur. It causes severe damage to the skin.
After observing the mortality data of last year, scientists identified a need to overcome the threat of a situation that causes a higher number of deaths last year.
Therefore, the correct option for this question is D.
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Final answer:
The scientist noticing an increase in skin cancer deaths is engaged in Identifying a need, the first step of the engineering process where problems are recognized.
Explanation:
If a scientist has noticed a significant increase in the number of deaths related to skin cancer from the previous year, she is most likely engaged in Identifying a need (Option D). This is the first step in the engineering process, where a problem or opportunity is recognized that may need a new or modified technological solution. In the context of this scenario, the identification of the increased skin cancer deaths could lead to a need for improved public health policies, educational programs on sun safety, or the development of better skin protection products.
In which of the following is the name and formula paired correctly?
stannic fluoride, SnF4
barium nitride, Ban
cobaltous chloride, CoCl3
sodium oxide, Nao
Answer:
Stannic fluoride, SnF4
Explanation:
The chemical formula of Barium nitride is Ba(NO3)2.
The chemical formula of Cobaltous chloride is COCl2.
The chemical formula of Sodium Oxide is Na2O.
So the correct one is stannic fluoride, SnF4.
Answer:
The name and formula is paired correctly for Stannic Fluoride - [tex]SnF_4[/tex]
Explanation:
In this case, we have four names of chemical substances and four formulas. So, we should check each one of those in order to be sure if the name and the formula are paired correctly.
First: Sodium Oxide. The formula for this oxide is [tex]Na_2O[/tex]. The formula paired is NaO. In this case, formula and name are not correctly paired. NaO is not a chemical substance, due to the fact that Oxygen always should have -2 of valence as it was shown in the right formula [tex]Na_2O[/tex]
Second: Cobaltous Chloride. The formula for this Chloride is [tex]CoCl_2[/tex]. The formula paired is [tex]CoCl_3[/tex].
[tex]CoCl_3[/tex] name is Cobaltic Chloride. Taking into account both formula we can mention that formula and name are not correctly paired.
Third: Barium Nitride. The formula for this Nitride is [tex]Ba_3N_2[/tex]. The formula paired is BaN. Formula and name are not correctly paired. BaN is not a chemical substance, Valence of elements are not coherent with the groups in the periodic table.
Finally: Stannic Fluoride. The formula for this Fluoride is [tex]SnF_4[/tex]. The formula paired is [tex]SnF_4[/tex]. So, this is the formula and name correctly paired.
What substance has a melting point of 0 and a boiling point of 100
Answer:
Water
Explanation:
Water molecules are known to have a melting point of 0°C and a boiling point of 100°C.
The melting and boiling points are as a result of the intermolecular force of attraction between the molecules of water. The predominant bond type that dictates the property of the melting and boiling point is the hydrogen bonding. This bond is a strong force of attraction and it impacts on the physical properties of water.
Answer:
Water
Explanation:
The substance that has a melting point at 0 and a boiling point at 100 is water. Water is the only substance that fits into this category. According to van.physics.illinois.edu, it states the following "For pure water, the boiling point is 100 degrees Celsius (212 Fahrenheit) at one atmosphere of pressure, and the melting point is 0 degrees Celsius (32 degrees Fahrenheit) at one atmosphere of pressure."
Answer: Water
In a closed system containing three different gases as shown, X2 + Y2 2XY. Choose the TWO things that MUST happen as the volume of the system is decreased at constant temperature. 1)The relative concentrations of each gas must change. 2)The concentration of each gas will increase. 3) The relative concentrations of each gas must remain constant. 4)The concentration of each gas will not change.
Answer:
C,D
Explanation:
Answer:
C D
Explanation:
Given the following balanced reaction between liquid ammonia and oxygen gas to produce nitrous oxide gas and water, how many grams of water, H2O, are produced from 317 grams of ammonia and excess oxygen? (To find the molar mass in the problem use the periodic table and round the mass to the hundreds place for calculation).
(A) 224 g
(B) 335 g
(C) 503 g
Answer:
(C) 503 g
Explanation:
Balanced reaction:
2NH₃ + 2O₂ → N₂O + 3H₂O
Stoichiometry:
317 g NH₃ × (1 mol NH₃ / 17.03 g NH₃) = 18.61 mol NH₃
18.61 mol NH₃ × (3 mol H₂O / 2 mol NH₃) = 27.92 mol H₂O
27.92 mol H₂O × (18.02 g H₂O / mol H₂O) = 503 g H₂O
Answer:
(C) 503 g of water, H2O, are produced from 317 grams of ammonia and excess oxygen
Explanation:
[tex]2 NH_3+2 O_2>N_2 O+3 H_2 O[/tex]
Molar mass of
[tex]H_2 O=(2\times1.008)+15.999=18.02 g/mol[/tex]
Molar mass of
[tex]NH_3=14.01+(3\times1.008)=17.03 g/mol[/tex]
The conversions are
Step 1:
Mass [tex]NH_3[/tex] to moles [tex]NH_3[/tex] by dividing with molar mass [tex]NH_3[/tex]
Step 2:
Moles [tex]NH_3[/tex] to moles [tex]H_2 O[/tex] by using mole ratio of [tex]NH_3:H_2 O[/tex] i.e., 2 : 3
Step 3:
Moles [tex]H_2 O[/tex] to mass [tex]H_2 O[/tex] by multiplying with molar mass [tex]H_2 O[/tex]
[tex]317gNH_3 \times \frac {(1mol NH_3)}{(17.03gNH_3 )} \times \frac {(3mol H_2 O)}{(2mol NH_3 )} \times \frac {(18.02g H_2 O)}{(1mol H_2 O)}[/tex]
[tex]= 503g H_2 O[/tex] is formed.
(Answer)
Please note :
To convert moles to mass, we multiply by molar mass
To convert mass to moles, we divide by molar mass
Molar mass is the mass of 1 mole of the substance
For example molar mass of [tex]CO_2[/tex] is
[tex](12.0+2\times16)=44 g/mol[/tex]
(we just add the atomic mass of the atoms to get the molar mass of the substance).
what is 2\5 please let me know what the answer
Answer: 0.4
Explanation: The easiest way to do this is to get a denominator of 10. To do this, multiply each number in 2/5 by 2. You will get the fraction 4/10. With the denominator of 10, the answer would be 0.4 by putting the decimal in front of the number.
Which requires more energy to move an electron?
from n = 3 to n = 4
from n = 2 to n = 3
from n = 1 to n = 2
Answer:
From n=1 to n=2
Explanation:
Electrons in n=1 are strongly attracted to the nucleus and therefore will require great force to overcome the electrostatic force of attraction to displace them from the energy level to another.
The electrostatic force reduces as you progress to the outer energy levels.
Answer:
C. from n = 1 to n = 2
Explanation:
A.
[tex]\Delta E=E_{final}-E_{initial}[/tex]
[tex]\Delta E=-1312[\frac{1}{(n_f^2 )}-\frac {1}{(n_i^2 )}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[\frac{1}{(4^2 )}-\frac {1}{(3^2 )}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[\frac{1}{(16 )}-\frac {1}{(9)}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[0.0625-0.111]KJ mol^{-1}[/tex]
[tex]\Delta E=64 KJ mol^{-1}[/tex]
B.
[tex]\Delta E=E_{final}-E_{initial}[/tex]
[tex]\Delta E=-1312[\frac{1}{(n_f^2 )}-\frac {1}{(n_i^2 )}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[\frac{1}{(3^2 )}-\frac {1}{(2^2 )}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[\frac{1}{(9 )}-\frac {1}{(4)}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[0.111-0.25]KJ mol^{-1}[/tex]
[tex]\Delta E=182 KJ mol^{-1}[/tex]
C.
[tex]\Delta E=E_{final}-E_{initial}[/tex]
[tex]\Delta E=-1312[\frac{1}{(n_f^2 )}-\frac {1}{(n_i^2 )}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[\frac{1}{(2^2 )}-\frac {1}{(1^2 )}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[\frac{1}{(4)}-\frac {1}{(1)}]KJ mol^{-1}[/tex]
[tex]\Delta E=-1312[0.25-1]KJ mol^{-1}[/tex]
[tex]\Delta E=984 KJ mol^{-1}[/tex]
In the reaction below, if 5.71 g of sulfur is reacted with 10.0 g of oxygen, how many grams of sulfur trioxide will be produced?
Answer:
14.3 g SO₃
Explanation:
2S + 3O₂ → 2SO₃
First, find the limiting reactant. To do that, calculate the mass of oxygen needed to react with all the sulfur.
5.71 g S × (1 mol S / 32 g S) = 0.178 mol S
0.178 mol S × (3 mol O₂ / 2 mol S) = 0.268 mol O₂
0.268 mol O₂ × (32 g O₂ / mol O₂) = 8.57 g O₂
There are 10.0 g of O₂, so there's enough oxygen. The limiting reactant is therefore sulfur.
Use the mass of sulfur to calculate the mass of sulfur trioxide.
5.71 g S × (1 mol S / 32 g S) = 0.178 mol S
0.178 mol S × (2 mol SO₃ / 2 mol S) = 0.178 mol SO₃
0.178 mol SO₃ × (80 g SO₃ / mol SO₃) = 14.3 g SO₃