The molar flow rate of feed Fao = 2.5 mol/min
Performance equation for cstr gas phase first order reaction with conversion Xa = 0.9
A --> B + 2C
Volume expansion factor E =( 3-1)/1 = 2
Reaction rate constant at 50 C, k1 = 10-4 min-1
Activation energy Ea = 85 kj/mol
Entering pressure P= 10 atm
Temperature T2 = 127 C = 400k
Cao = P2/RT2 = 10 atm/(0.0821L.atm/mol.k)*400k = 0.3045 mol/L
By Arrhenius equation
Ln(k2/k1) = Ea/R *(1/T1 - 1/T2)
Ln(k2/10-4) = 85000/8.314*(1/323 - 1/400)
k2 = 1.77*10-4 min-1
The molar flow rate of feed Fao = 2.5 mol/min
Performance equation for cstr gas phase first order reaction with conversion Xa = 0.9
V/Fao = *Xa/(-rA) = Xa(1+EXa)/kCao(1-Xa)
V = Fao*Xa(1+EXa)/k2Cao(1-Xa)
V = 2.5*0.9(1+2*0.9)/1.77*10-4*0.3045(1-0.9)
V = 1168881 L = 1168.88 m3
volume of the reactor V = 1168.88m3
space time of the reactor,
Tou = V/vo = VCao/Fao= 1168881L*(0.3045mol/L)/(2.5mol/min) = 142369.74 min
b) reaction is reversible then,
Kc = [B][C]2/[A]
Kc = 0.025 mol2/dm6
Kc = CaoXae * (2*CaoXae)2/Cao(1-Xae)
0.025 = 4*0.30452Xae3/(1-Xae)
Xae3/(1-Xae) = 0.066
Put Xae = 0.35then it satisfies above equation
0.353/(1-0.35) = 0.0659
equilibrium conversion Xae = 0.35
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What is a key difference between chemical and nuclear reactions?
The key difference in between the chemical and the nuclear reactions is Chemical reaction will occurs outside the nucleus and the Nuclear reaction occurs inside the nucleus.
The Chemical reaction will normally occurs outside the nucleus. The Nuclear reaction will only occurs inside the nucleus. When the chemical reactions occur the elements will hold their identity and the nuclei of the atoms also be remains unchanged. During the nuclear reactions, the nuclei of the atoms will changes completely and the new elements are formed.
The chemical reactions will be balance in terms of the mass and the nuclear reaction will occurs in the terms of the mass and the energy.
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pls help!!!!! and please provide explanation i will give brainlist
A) To calculate the total bond energy, we need to know the bonds broken and formed in the reaction. In this case, the reactants are C₂H₄ and H₂, and the product is C₂H₆.
Reactants:
C₂H₄ has one C=C bond and four C-H bonds. Total bond energy
= (1 x 614 kJ/mol) + (4 x 413 kJ/mol) = 2462 kJ/mol
H2 has one H-H bond. Total bond energy
= 1 x 436 kJ/mol = 436 kJ/mol
Products:
C₂H₆ has six C-H bonds and one C-C bond.
Total bond energy
= (6 x 413 kJ/mol) + (1 x 348 kJ/mol) = 2862 kJ/mol
Total energy = reactant energy - product energy = (2462 kJ/mol + 436 kJ/mol) - 2862 kJ/mol = 36 kJ/mol
Therefore, the total bond energy for the reaction is 36 kJ/mol.
B) The reaction is exothermic because the total energy is negative (-36 kJ/mol). This means that energy is released when the reaction occurs.
C) The formation of C-C bond releases energy (348 kJ/mol), and the breaking of C=C bond requires energy input (614 kJ/mol). The formation of four C-H bonds releases energy (4 x 413 kJ/mol = 1652 kJ/mol), and the formation of two additional C-H bonds releases more energy (2 x 413 kJ/mol = 826 kJ/mol). The breaking of one H-H bond requires energy input (436 kJ/mol).
The total energy released by the formation of new bonds is greater than the energy required to break the old bonds, resulting in an exothermic reaction.
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What is the pOH of a solution that has a [OH-] = 5.8 x 10^-9 *
A. 9.8
B. 5.8
C. 4.2
D. 8.2
6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.
What is pOH?The concentration of hydroxide ions (OH-) is measured by pOH. It can be employed to express a solution's alkalinity.
Aqueous solutions containing pOH less than 7 at 25 degrees Celsius are alkaline, pOH larger than 7 are acidic, as well as pOH equal to 7 constitute neutral.
pOH = -log[ OH ]
pOH = -log[ 5.8 x 10⁻⁹ ]
= 5.84
Therefore, 6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.
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Suppose that 22 mL of 0.1 M K2CrO4 reacts with 14.6 mL of AgNO3 completely. What mass of NaCl is needed to react completely with 35.2 mL of the same AgNO3 solution?
Answer in units of g.
According to the solving 0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.
What is a chemical reaction with an example?A chemical reaction is an event in which reactants chemically reacts and transform into products chemically. As an illustration, during respiration, oxygen is inhaled and combines with glucose to create carbon dioxide, water, and energy.
According to the given information:K₂CrO₄ + 2 AgNO₃ → 2 KNO₃ + Ag₂CrO₄
the moles of AgNO3 used in the reaction with K2CrO4 is:
n(AgNO3) = (14.6 mL) (0.1 mol/L)
= 1.46 × 10⁻³ mol
Since the same amount of AgNO3 is used in the reaction with NaCl, we can calculate the moles of NaCl needed to react completely with 35.2 mL of 0.1 M AgNO3:
n(NaCl) = n(AgNO3) / 2
= (1.46 × 10⁻³ mol) / 2
= 7.3 × 10⁻³ mol
To calculate the mass of NaCl needed, we can use its molar mass:
M(NaCl) = 58.44 g/mol
Mass of NaCl needed = n(NaCl) x M(NaCl)
= (7.3 × 10⁻⁴ mol) x (58.44 g/mol)
= 0.0427 g
0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.
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If pressure of a gas is 722.4 torr and the volume is 3.79litre and the temperature is 300K what will be the no of moles?( can the gas eq constant be used in tore and atm)
Answer:0.146 torr
Explanation:
Yes to the gas constant
you use 0.0821 L.atm/mol.k If you want pressure in atm
use 62.44 L.torr/ mol.k if you want pressure in torr
n=PV/RT
n= 722.4 X 3.79/(62.44 X 300) =
Pls I need help urgently. If you continue to putting one drop of water on one side of the paper towel, what do you observe happening to the water, the more drop you add? Explain
Answer:
the water is being observed a bi paper towel material through a process called capillary action capital reaction on Sonu's capability is a rising or absorption
Answer: The water spreads out and covers a larger area on the paper towel.
How many coordinate covalent bonds, if any, does the ion AT3 have? A has 5
valence electrons, and T has 6 valence electrons. Both A and T cannot exceed the
octet. Explain your answer. Be sure to consider the Lewis structure with the proper
formal charges to determine your answer.
The ion AT3 has a total of 22 valence electrons: 5 from A and 6 from T, multiplied by 3 since there are three T atoms.
What is ion AT3?Generally, To determine the number of coordinate covalent bonds, we need to draw the Lewis structure and check the formal charges.
If A donates three electrons to each T atom, it will have a formal charge of +2 (5 valence electrons - 3 donated electrons - 0 non-bonding electrons). Each T atom will have a formal charge of -1 (6 valence electrons - 3 donated electrons - 2 non-bonding electrons).
The Lewis structure for AT3 will have single bonds between A and each T atom, and each T atom will have a lone pair of electrons.
The total number of electrons used in the bonds is 6 (2 from each bond). The remaining 16 electrons will be distributed among the three T atoms as lone pairs.
Therefore, there are no coordinate covalent bonds in the ion AT3.
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(28) CCC Cause and Effect Young's modulus is a measure
of a solid material's stiffness. A highly ductile
material will typically have a very low modulus. The
table shows several different metals, their crystalline
structure, and their Young's modulus. Describe the
pattern you observe and explain the connection
between structure and stiffness.
From the table, it is very clear that as the crystallinity increases, its stiffness also increasing. The FCC structures are having less crystallinity and is more ductile than BCC structure.
What is ductility of a material ?Ductility of a material is the ability to make very thin elongated wires. Whereas, stiffness of a material is the resistance to any elongation or compression.
The more crystalline the material, more will be the stiffens. The material with higher Young's modulus (Y) are more crystalline and stiff. As Y decreases, stiffness decreases, the material becomes ductile.
Because the body-centered cubic (BCC) lattice is not tightly packed despite being cubic, the face-centered cubic (FCC) crystalline structure has greater ductility than the BCC.
Due to the fact that a hexagonal close-packed (HCP) lattice is densely packed but not cubic, HCP metals are less ductile than BCC and FCC metals.
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Suppose 316.0g aluminum sulfide reacts with 493.0g of water.
2Al2S3 + 6H2O = 2AlOh3 + 3H2S
a. How many grams of hydrosulfric acid can be formed.
b. Determine the limiting reactant.
c. How many grams of the excess reactant remains.
d. Determine the percent yield of hydrofluoric acid, if in an experiment 203g were formed.
a) 107.1 g of hydrosulfric acid can be formed.
b) Aluminium sulfide is the limiting reactant.
c) 378g of excess reactant remains.
d) 52.75 % is the percent yield.
What is Limiting reactant?The limiting reactant or limiting reagent is a reactant in a chemical reaction that determines the amount of product that is formed.
Identification of the limiting reactant can help calculate the theoretical yield of a reaction.
Given the reaction,
2Al₂S₃ + 6 H₂O = 2Al(OH)₃ + 3H₂S
Mass of aluminium sulfide = 316g
Mass of water = 493 g
Moles = Mass ÷ molar mass
Moles of Aluminium sulfide = 316 ÷ 150
= 2.10 moles
Moles of water = 493 ÷ 18
= 27.3 moles
Since moles of aluminium sulfide is less, it is the limiting reagent.
From the reaction, 2 moles of aluminium sulfide gives 3 moles of H₂S.
1 moles of Al₂S₃ will give 3 ÷ 2 moles of H₂S.
Thus, 2.1 moles of Al₂S₃ will give 1.5 × 2.1 moles
= 3.15 moles of H₂S
Mass of H₂S = Moles × molar mass
= 3.15 × 34 = 107.1 g
From the reaction, 2 moles of aluminium sulfide gives 6 moles of H₂O.
1 mole will need 3 moles of water.
Thus, 2.1 moles will need 3 × 2.1 moles = 6.3 moles of water
Excess of water = 27.3 - 6.3 = 21 moles
Mass of excess reactant = 21 × 18 = 378g
Actual yield of H₂S = 203g
Theoretical yield = 107.1 g
% yield = (107.1 × 100) ÷ 203 = 52.75 %
Therefore,
a) 107.1 g of hydrosulfric acid can be formed.
b) Aluminium sulfide is the limiting reactant.
c) 378g of excess reactant remains.
d) 52.75 % is the percent yield.
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How many moles of KNO3 would have to be added to 100g of water to form a saturated solution at 10C?
We need to add 0.316 moles of KNO3 to 100g of water to form a saturated solution at 10°C.
How to determine the number of moles would have to be added ?
To determine how many moles of KNO3 would have to be added to 100g of water to form a saturated solution at 10°C, we need to know the solubility of KNO3 at this temperature.
According to the solubility data, the solubility of KNO3 at 10°C is approximately 32 grams per 100 grams of water.
So, to make a saturated solution at 10°C, we need to add 32 grams of KNO3 to 100 grams of water.
Now, we can calculate the number of moles of KNO3 needed using its molar mass :
Molar mass of KNO3 = 101.1 g/mol
Number of moles of KNO3 = mass of KNO3 / molar mass of KNO3
Number of moles of KNO3 = 32 g / 101.1 g/mol
Number of moles of KNO3 = 0.316 moles
Therefore, we need to add 0.316 moles of KNO3 to 100g of water to form a saturated solution at 10°C.
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A table is titled Effect of Speed on Kinetic Energy. A blank graph is shown to the right.
A table shows the mass in kilograms, the speed in meters per second and the kinetic energy in Joules for four trials. The last column, titled Drag to Graph, displays a car icon. Trial 1: Mass is 2; Speed is 1; Kinetic Energy is 1. Trial 2: Mass is 2; Speed is 2; Kinetic Energy is 4. Trial 3: Mass is 2; Speed is 3; Kinetic Energy is 9. Trial 4: Mass is 2, Speed is 4; Kinetic Energy is 16. A blank graph is shown to the right. The vertical axis is titled Kinetic Energy, Joules. It is labeled from 0 to 20 in increments of two. The horizontal axis is titled Speed, meters per second. It is labeled from 0 to 5 in increments of one.
Car 1
Car 2
Car 5
Car 4
Based on the given information, we can plot the data points on the blank graph to see the effect of speed on kinetic energy:
Vertical axis: Kinetic Energy (Joules)
Horizontal axis: Speed (meters per second)
Define the term kinetic energy.
The energy an object has as a result of its motion is known as kinetic energy. It is a scalar quantity and is defined as one-half of the product of an object's mass and the square of its velocity. Mathematically, it can be represented as:
Kinetic Energy = 1/2 x mass x [tex]velocity^{2}[/tex]
where mass is the mass of the object in kilograms and velocity is the speed of the object in meters per second.
Kinetic energy is a form of mechanical energy and can be transferred between objects in collisions or other interactions. It is a fundamental concept in physics and is used to understand and describe the behavior of moving objects in various physical systems.
The data points are:
Trial 1: Mass=2, Speed=1, Kinetic Energy=1
Trial 2: Mass=2, Speed=2, Kinetic Energy=4
Trial 3: Mass=2, Speed=3, Kinetic Energy=9
Trial 4: Mass=2, Speed=4, Kinetic Energy=16
Therefore, The graph shows that as the speed increases, the kinetic energy also increases. The relationship between speed and kinetic energy is quadratic, which means that the kinetic energy increases with the square of the speed.
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What is the specific rotation of (R)-(-)-monosodium glutamate
The specific rotation of a substance is a measure of its ability to rotate the plane of polarized light. It is usually denoted by the symbol [α] and is expressed in degrees per unit length and concentration.
The specific rotation of (R)-(-)-monosodium glutamate is -2.4° (or -2.4 degrees) when measured in a 1-decimeter cell at a concentration of 10 g/100 mL in water. The negative sign indicates that the rotation is counterclockwise or left-handed, which is typical for most amino acids.
Note that the specific rotation of a substance can vary depending on the wavelength of light used and the temperature at which the measurement is taken. Therefore, it is important to specify these parameters when reporting the specific rotation of a substance.
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I NEED HELP ON THIS ASAP!!!
Write a one paragraph summary about atomic model(s). Be sure to describe the process one must go through to create a model. Also, briefly explain the mathematical data needed to create an accurate model.
Explanation:
The atomic model is a scientific theory that describes the structure and behavior of atoms. In the early 20th century, scientists began to develop new models of the atom as they discovered more about its properties. One of the earliest models was proposed by J.J. Thomson in 1897, which suggested that the atom was a sphere of positive charge with negatively charged electrons embedded within it. This model was later replaced by the Rutherford model in 1911, which showed that the atom had a small, dense nucleus surrounded by orbiting electrons. The modern quantum mechanical model of the atom, which is widely accepted today, uses complex mathematical equations to describe the behavior of electrons within atoms. To create an accurate model, scientists must use experimental data, such as the energy levels of electrons, the wavelengths of light emitted by atoms, and the positions of spectral lines, to calculate the probabilities of where electrons are likely to be found within the atom. The resulting model allows scientists to make predictions about how atoms will behave under different conditions, and it has many practical applications in fields such as chemistry, physics, and engineering.
Answer:
Atomic models are representations of the structure of an atom. They are important tools in understanding the behavior of atoms and their interactions with other atoms. In creating an atomic model, scientists must first gather and analyze experimental data to determine the properties and behavior of the atoms. They then use mathematical equations and theories, such as quantum mechanics, to develop a model that accurately represents the observed behavior of the atoms. The model must take into account the position and movement of the electrons around the nucleus, as well as the various energy levels of the electrons. By studying atomic models, scientists have been able to make important discoveries about the nature of matter and the fundamental forces that govern the behavior of atoms.
Explanation:
Calcium Chloride Calcium chloride (CaCl₂) is a white solid soluble in water. It is the main constituent of several medicinal drugs used to treat calcium deficiency (low levels) in the human body. In agriculture, it is used to provide supplemental calcium to plants to delay their aging. 1. Pick out from the text, the use of calcium chloride in medication.
Answer:
Calcium chloride is used in medication to help treat people who have low levels of calcium in their body. It helps supplement the necessary amount of calcium needed for healthy functioning.Answer:
Calcium chloride is used in medication to help treat people who have low levels of calcium in their body. It helps supplement the necessary amount of calcium needed for healthy functioning.
Explanation:
In what way can we play our role in the field of science? (as a student)
In what ways are the buffering abilities of carbon sinks being reduced by climate change?
There is a different way to contribute to the CO₂ budget balance besides reducing or turning off this carbon, which would help reduce the amount of greenhouse gases in the atmosphere. However, that depends on the precise amount of carbon that the oceans, trees, and plants are absorbing.
What are the buffering abilities of carbon sinks?The carbon sinks in the cycle have so far had plenty of extra capacity. In fact, since we began burning fossil fuels for energy after the Industrial revolution, about half of the carbon dioxide emissions released into the atmosphere have naturally cycled away again.
A quarter of this carbon dioxide dissolves in water, so the oceans have absorbed it. As they used sunlight to turn it into glucose and oxygen during photosynthesis, plants use up an additional quarter.
The airborne carbon that was captured now exists as trees or is buried in peat, grassland, and soils. It is submerged in the water, dissolving in the deep ocean, or drifting as sediment on the seafloor. In other words, the planet has improved.
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Which statement describes the formation of galaxies?
They begin in nebulas.
Heat and gases contract.
Gravity causes stars to cluster.
Dust and gases contract.
The statement that describes the formation of galaxies is "Gravity causes stars to cluster."
What is galaxies ?
Large systems of stars, gas, dust, and dark matter are known as galaxies, and they are bound together by gravity. These galaxies, which range in size from dwarf galaxies with only a few million stars to gigantic galaxies with trillions of stars, are the fundamental units of the universe.Spiral galaxies, elliptical galaxies, irregular galaxies, and lenticular galaxies are only a few of the different sizes and shapes of galaxies. The number and configuration of a galaxy's arms, the existence of a central bulge, and the quantity of interstellar gas and dust are only a few of the distinctive features that distinguish each type of galaxy from another.The statement that describes the formation of galaxies is "Gravity causes stars to cluster."
Galaxies form from the accumulation of gas, dust, and dark matter through the force of gravity. As the gas and dust in a galaxy cluster together, they begin to collapse under their own gravity, forming stars. Over time, these stars cluster together and form galaxies. Therefore, the correct statement that describes the formation of galaxies is gravity causes stars to cluster.
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What percent of magnesium bromide, MgBr2 is magnesium?
Answer:
percentage composition = 13.2%
Explanation:
percentage of magnesium in magnesium bromide can be found by molar mass of magnesium over molar mass of magnesium bromide.
Molar mass of elements can be found using a standard IUPAC Periodic Table.
M(Mg) = 24.31 g/mol
M(MgBr₂) = 24.31 + 79.90×2 = 184.11 g/mol
∴ percentage composition = 13.2%
What volume of a 0.500 M sodium chloride solution is required to make 500. mL of
a 0.100 M sodium chloride solution?
1L
100 L
0.100 L
0.100 ml
Explanation:
Refer to pic..... .. .....
Given the volume of the 0.500 M sodium chloride solution is 500 mL. Then, the volume of 0.100 M sodium chloride solution is 2500 ml.
What is molarity ?Molarity of a solution is the ratio of its number of moles of solute to the volume of solution in liters. It is the common term to express the concentration of a solution.
The product of molarity and volume then being the number of moles of solute in the solution. Let V1 and M1 be the volume of molarity of a solution and V2 and M2 be the volume and concentration of the diluted solution.
then,
M1 V1 = M2 V2
Given,
M1 = 0.500 M
V1 = 500 mL
M2 = 0.100 M
then V2 = M1 V1/ M2
V2 = 0.500 M × 500 ml /0.100 M
= 2500 ml.
Therefore, the volume of the diluted solution is 2500 ml.
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Describe the feedback loop involving water vapor and temperature. Is it positive or negative?
Answer:
The feedback loop involving water vapor and temperature is a positive feedback loop. As temperature increases, the amount of water vapor that can be held in the atmosphere also increases. This leads to an increase in the amount of water vapor in the atmosphere, which further amplifies the greenhouse effect and contributes to additional warming.
In other words, warmer temperatures lead to more water vapor in the atmosphere, which traps more heat, causing further warming, and so on. This positive feedback loop can amplify the initial warming effect caused by other factors such as greenhouse gas emissions or changes in solar radiation.
Conversely, if the temperature decreases, the amount of water vapor that can be held in the atmosphere decreases, which can lead to a decrease in the amount of water vapor present in the atmosphere, reducing the greenhouse effect and contributing to cooling. However, this negative feedback loop is weaker than the positive feedback loop described above, and it tends to be dominated by the positive feedback loop under most circumstances.
Theory of Plate Tectonics: Complete the sentence:
1. The theory of plate tectonics states that the
is broken into pieces called
slowly moving due to
It is believed that tectonic plates move as a result of convection in the asthenosphere and gravity.
What are Tectonic plates?According to the widely recognized scientific hypothesis known as plate tectonics, the Earth's lithosphere is made up of many sizable tectonic plates that have been steadily moving for nearly 3.4 billion years.
A tectonic plate, also known as a lithospheric plate, is a sizable slab of solid rock with an uneven shape that is typically made up of both continental and oceanic lithosphere. The Pacific and Antarctic Plates are among the largest plates, but they can range in size from a few hundred to thousands of kilometers broad.
Thus, it follows that convection in the asthenosphere and gravity are thought to be the causes of tectonic plate movement.
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What gas in the air is used by plants to make their own food?
Nitrogen
Water vapor
Carbon dioxide
Oxygen
Answer:
Carbon dioxide
Explanation:
Carbon dioxide gas is used by plants for the preparation of food materials. During this food preparation process, plants take up carbon dioxide from the air and give up oxygen.
Deposition is a process that… A: moves rock particles. B: drops sediment. C: breaks down rock. D: dissolves sediment
Answer:
cbbb vdf jfjd hx
Explanation:
PLEASE HELP
How many liters of CO2 are produced when 48.92g CaCO3 decomposes?
Explanation:
OK thank you so much I hope you are well
Calculate the equilibrium constant for the chemical reaction, given the equilibrium concentrations of the reactants and products in the table.
2AB(aq)+4CD(aq)↽−−⇀2AD(aq)+2BD(aq)+4C(aq)
The value of the equilibrium constant is independent of the initial concentration of the reactants. It has a definite value for every reversible reaction at a particular temperature.
What is equilibrium constant?The equilibrium constant can be defined as the ratio of the product of molar concentrations of the products to that of the reactants with each concentration term raised to a power equal to its coefficient in the balanced chemical equation.
The expression of the equilibrium constant is:
Keq = [AD]² [BD]² [C]⁴ / [AB]²[CD]⁴
Thus the expression of the equilibrium constant is determined.
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(ALOT OF QUESTIONS) if anybody sees this can they help me out?
Which of the following statements is true about strong, weak, and nonelectrolytes?
A) Strong electrolytes partially dissociate in water, weak electrolytes partially dissociate, and nonelectrolytes completely dissociate.
B) Strong electrolytes partially dissociate in water, weak electrolytes completely dissociate, and nonelectrolytes do not dissociate.
C) Strong electrolytes completely dissociate in water, weak electrolytes do not dissociate, and nonelectrolytes partially dissociate.
D) Strong electrolytes completely dissociate in water, weak electrolytes partially dissociate, and nonelectrolytes do not dissociate.
Which of the following substances is insoluble in water, according to these solubility rules?
A) Sodium chloride (NaCl)
B) Calcium hydroxide (Ca(OH)2)
C) Potassium nitrate (KNO3)
D) Silver chloride (AgCl)
Which of the following ions is soluble in water when paired with according to the solubility rules chart?
C) Chloride (Cl-)
B) Sulfate
D) Hydroxide (OH-)
A) Carbonate
Question 12 (1.25 points)
Which of the following combinations will result in a precipitate, according to solubility rules?
A) Sodium nitrate (Na2CrO4) and barium chloride (BaCl2)
B) Ammonium chloride (NH4Cl) and sodium hydroxide (NaOH)
C) Calcium sulfate (CaSO4) and sodium carbonate (Na2CO3)
D) Potassium iodide (KI) and silver nitrate (AgNO3)
Question 13 (1.25 points)
Which of the following statements is true about dilute and concentrated solutions?
A) Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions.
B) Concentrated solutions contain more solute than dilute solutions.
C) Dilute solutions contain more solute than concentrated solutions.
D) Concentrated solutions have a higher solvent-to-solute ratio than dilute solutions.
Question 14 (1.25 points)
What volume of a 0.500 M sodium chloride solution is required to make 500. mL of a 0.100 M sodium chloride solution?
A) 100 L
B) 0.100 ml
C) 0.100 L
D) 1 L
Question 15 (1.25 points)
A student has a 0.500 M solution of hydrochloric acid (HCl) that is too concentrated for an experiment. The student needs to dilute the solution to 0.100 M. If the student needs 250 mL of the diluted solution, how much of the original solution should be used?
A) 250 ml
B) 50.0 ml
C) 125 ml
D) 500 ml
The statement that is true about strong electrolytes , weak electrolytes , and non-electrolytes is:
Strong electrolytes completely dissociate in water, weak electrolytes partially dissociate, and nonelectrolytes do not dissociate. Option DSilver chloride (AgCl) is insoluble in water; option D.
Chloride (Cl-) ion is soluble in water; option C
Potassium iodide (KI) and silver nitrate (AgNO₃) will result in a precipitate, according to solubility rules; option D.
Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions; option A.
What volume of a 0.500 M sodium chloride solution is required to make 500 mL of a 0.100 M sodium chloride solution?The volume of sodium chloride solution required is calculated using the formula:
M1V1 = M2V2Where:
M1 = 0.500 M (initial concentration)
V1 = volume of initial solution (unknown)
M2 = 0.100 M (final concentration)
V2 = 500 mL = 0.500 L (final volume)
Rearranging the formula to solve for V1, we get:
V1 = M2V2/M1
V1 = (0.100 M)(0.500 L)/(0.500 M)
V1 = 0.100 L
The volume of the 0.500 M sodium chloride solution required is 0.100 L.
15. The volume of the original solution required will be;
M1V1 = M2V2
Where:
M1 = 0.500 M (initial concentration)
V1 = volume of initial solution (unknown)
M2 = 0.100 M (final concentration)
V2 = 250 mL = 0.250 L (final volume)
Rearranging the formula to solve for V1, we get:
V1 = M2V2/M1
V1 = (0.100 M)(0.250 L)/(0.500 M)
V1 = 0.050 L or 50.0 mL
The volume of the original 0.500 M hydrochloric acid solution needed is 50.0 mL.
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I NEED THIS FAST!!
How many grams are in 9.100 X 10/20 molecules of uranium(V) oxide, U2O5?
Explanation:
Refer to pic............
Calculate the mass of oxygen gas formed when 10g of potassium trioxocarbonate (vi) is heated strongly. (K= 39, O=16, N=14)
One mole of potassium carbonate decompose to give one mole or 32 g of oxygen. Hence, 10 g of potassium carbonate will give 2.31 g of oxygen gas.
What is decomposition reaction?Decomposition is type of reaction in which the one compound breaks into its constituent elements and compounds. Potassium carbonate is an ionic compound which can decomposed on heating to given CO and oxygen gas as follows:
[tex]\rm K_{2}CO_{3} \rightarrow 2 K + O_{2} + CO[/tex]
As per this balanced chemical equation of the decomposition, one mole of potassium carbonate produces one mole of oxygen gas.
molar mass of potassium carbonate = 138 g/mol
molecular mass of O₂ = 32 g/mol
Hence, 138 g of potassium carbonate gives 32 g of oxygen gas. Then, 10 g of potassium carbonate will give
(10 × 32)/138 = 2.31 g.
Therefore, the mass of oxygen formed from 10 g of potassium carbonate will be 2.31 g.
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i need help due im 20 mins
need this done quick
Explanation:
1a) c since c is the biggest part of the pie chart
1b) 25% as it is close to a quarter
quarter=25%
1c) A=10%
1d) I think Mr.M's class was difficult since 35% of people got decent grades (a and b). As that is a percentage less than half of the class i would consider that as a difficult class.
Hope this helped.