Answer:
[tex]\large \boxed{\text{c = 2.50 mol/L; b = 3.96 mol/kg }}[/tex]
Explanation:
1. Molar concentration
Let's call chloroform C and acetone A.
Molar concentration of C = Moles of C/Litres of solution
(a) Moles of C
Assume 0.187 mol of C.
That takes care of that.
(b) Litres of solution
Then we have 0.813 mol of A.
(i) Mass of each component
[tex]\text{Mass of C} = \text{0.187 mol C} \times \dfrac{\text{119.38 g C}}{\text{1 mol C}} = \text{22.32 g C}\\\\\text{Mass of A} = \text{0.813 mol A} \times \dfrac{\text{58.08 g A}}{\text{1 mol A}} = \text{47.22 g A}[/tex]
(ii) Volume of each component
[tex]\text{Vol. of C} = \text{22.32 g C} \times \dfrac{\text{1 mL C}}{\text{1.48 g C}} = \text{15.08 mL C}\\\\\text{Vol. of A} = \text{47.22 g A} \times \dfrac{\text{1 mL A}}{\text{0.791 g A}} = \text{59.70 mL A}[/tex]
(iii) Volume of solution
If there is no change of volume on mixing.
V = 15.08 mL + 59.70 mL = 74.78 mL
(c) Molar concentration of C
[tex]c = \dfrac{\text{0.187 mol}}{\text{0.07478 L}} = \textbf{2.50 mol/L }\\\\\text{ The molar concentration of chloroform is $\large \boxed{\textbf{2.50 mol/L}}$}[/tex]
2. Molal concentration of C
Molal concentration = moles of solute/kilograms of solvent
Moles of C = 0.187 mol
Mass of A = 47.22 g = 0.047 22 kg
[tex]\text{b} = \dfrac{\text{0.187 mol}}{\text{0.047 22 kg}} = \textbf{3.96 mol/kg }\\\\\text{The molal concentration of chloroform is $\large \boxed{\textbf{3.96 mol/kg}}$}[/tex]
The molarity and molality of a solution can be calculated given the mole fraction of two components, their densities, and molar masses. The acetone will have a larger volume in the solution due to its higher mole fraction. By obtaining the masses of each component for a given volume, the number of moles of each can be calculated and used to compute molarity and molality.
Explanation:The subject of this question involves the calculation of molarity and molality of a solution. First, let us understand what molarity and molality mean. Molarity (M) is the number of moles of solute per liter of solution. Molality (m) is the number of moles of solute per kilogram of solvent.
Given that the mole fraction of chloroform (Cx) is 0.187, the mole fraction of acetone (Ay) can be calculated as 1 - Cx = 1 - 0.187 = 0.813. From the densities and molar masses of chloroform (119.38 g/mol) and acetone (58.08 g/mol), we can convert these to masses for a given volume. Assuming a total volume of 1 L for the solution, we know that the acetone has more volume due to its mole fraction. We can find the number of moles of each component from these masses, and finally, compute the molarity (moles/L) and the molality (moles/kg).
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What is the main element that stars are made of
HYDROGEN is the correct answer just test 2021
Which of the following characteristics did john Dalton include in his description of the atom?
Can be more than one!
A. Atoms are smaller than quarks.
B. In any element all the atoms are the same.
C. Atoms exist only on Earth
D. All matter is made up of atoms.
E. Elements in a compound are always in a constant ratio.
John Dalton's atomic theory described atoms as identical within an element, claimed all matter is composed of atoms, and stated that elements combine in constant ratios in compounds.
Explanation:John Dalton included several characteristics in his description of the atom that were fundamental to the formation of atomic theory. According to Dalton, B. In any element all the atoms are the same is a characteristic of atoms. He argued that each element has atoms that are identical in mass and properties but different from atoms of other elements. Another characteristic he proposed was D. All matter is made up of atoms, asserting that these atoms were the smallest particles constituting matter. Lastly, Dalton included that E. Elements in a compound are always in a constant ratio, meaning that compounds are formed by combining different types of atoms in fixed, small, whole-number ratios. Dalton's atomic theory, although later refined and partially revised, laid the groundwork for modern chemistry by providing a conceptual framework for understanding the composition of matter.
Which of the following is an inference?
a.
The flower is pink.
b.
Vinegar has a pungent aroma.
c.
A dog barks.
d.
A cup with steam coming from it will be hot to the touch.
Please select the best answer from the choices provided
A
B
C
D
Answer:
the answer is d
Explanation:
but wusup shawty
Final answer:
Among the provided options, 'A cup with steam coming from it will be hot to the touch' is an example of an inference because it is a conclusion based on the observation of steam, indicating the cup's contents are hot.
Explanation:
The question asks for the identification of an inference among four options. An inference is a conclusion reached based on evidence and reasoning rather than from explicit statements. Option d, 'A cup with steam coming from it will be hot to the touch', is an inference because it is a conclusion that one arrives at after observing steam, which suggests that the liquid inside the cup is likely hot.
Inference Examples
I didn't realize that they are husband and wife - an inference about their relationship.Who stole my durian smoothie? - an inference that someone took it without permission.In the context of a joke, the question 'How many months have 28 days?' with the answer 'All of them' involves linguistic or logical inference as it plays on the expectation that people will think of February alone.
A sample of a gas is placed inside a cylinder that is a led size. The cylinder is heated as additional gas
is added to it. What will most likely happen to the pressure of the gas inside the cylinder?
It will decrease.
It will increase.
It will not change.
Final answer:
When a gas in a fixed-volume cylinder is heated and additional gas is added, the pressure of the gas will most likely increase due to more frequent and forceful collisions of gas molecules with the container's walls.
Explanation:
The question is about what will happen to the pressure of the gas inside a cylinder when it is heated and additional gas is added. According to the principles of gas laws, specifically the combined gas law, which is related to pressure (P), volume (V), and temperature (T) of a gas, the pressure of the gas will increase if the temperature of the gas increases while the volume remains constant.
When the number of gas molecules is increased in a fixed volume, there is less space for the molecules to move, which means they will collide with the walls of the container more frequently, leading to an increase in pressure. Additionally, heating the gas will increase the kinetic energy of the molecules, resulting in more forceful collisions and therefore an increase in pressure.
How many moles of acetylene gas occupies a volume of 3.25 liters at STP?
Answer: 0.14 mole C2H2
Explanation: solution attached:
Derive n from PV= nR
n= PV/RT
= 1 atm ( 3.25 L) / (0.08205 L.atm/mol.K) ( 273 K)
= 0.14 mole C2H2
The individual dipole moments in ammonia (NH3) do not cancel each other
out. What is the strongest force that exists between molecules of ammonia?
Answer:
The strongest force that exists between molecules of Ammonia is Hydrogen Bonding.
Explanation:
Hydrogen Bond Interactions are those interactions which are formed between a partial positive hydrogen atom bonded directly to most electronegative atoms (i.e. F, O and N) of one molecule interacts with the partial negative most electronegative atom of another molecule.
Hence, in ammonia the nitrogen atom being more electronegative element than Hydrogen will be having partial negative charge and making the hydrogen atom partial positive. Therefore, the attraction between these partials charges will be the main force of interaction between ammonia molecules.
Other than Hydrogen bonding interactions ammonia will also experience dipole-dipole attraction and London dispersion forces.
PLEASE HELPP ______ consist of one large main root with smaller roots branching off, while _____ consist of several main roots that branch off to form one. mass of roots. Question 3 options: taproots; fibrous roots fibrous roots; taproots stems; leaves leaves; stems
Answer:
1st answer: Taproots
2nd answer: fibrous roots
Explanation:
How many grams of aluminum can react with 336g oxygen? 4Al + 3O2 --> 2Al2O3
Answer: 714 g Al2O3
Explanation: Solution attached
First convert mass of O2 to moles
Do the mole ratio between O2 and Al2O3 from the balanced equation.
Convert moles of Al2O3 to mass using its molar mass.
In a chemical reaction, 378 grams of aluminum can react with 336 grams of oxygen to form aluminum oxide, calculated using stoichiometry based on the balanced chemical equation.
The calculation of how many grams of aluminum can react with 336g of oxygen involves using stoichiometry, a technique in chemistry to calculate amounts of reactants and products.
The balanced chemical equation given is 4Al + 3O2 ⇒2Al2O3. First, we need to find the number of moles of oxygen by dividing the given mass of oxygen by its molar mass (32 g/mol for O2, thus 16 g/mol for O). Next, using the mole ratio from the balanced equation, calculate the moles of aluminum required to react with the obtained moles of oxygen. Finally, convert the moles of aluminum to grams using the molar mass of aluminum (27 g/mol).
The process will involve these steps:
Find moles of O2: 336 g O2 × (1 mol O2 / 32 g O2) = 10.5 mol O2.Using the mole ratio (4 mol Al : 3 mol O2), calculate moles of Al: 10.5 mol O2 ×(4 mol Al / 3 mol O2) = 14 mol Al.Convert moles of Al to grams: 14 mol Al × (27 g Al / 1 mol Al) = 378 g Al.Therefore, 378 grams of aluminum can react with 336 grams of oxygen to form aluminum oxide.
If a metal changes color over time from exposure to air, what has likely occurred?
a) a chemical change
b) a reversible change
c) a change of state
d) a physical change
Answer:
Option A. a chemical change
Explanation:
A chemical change is a change in which new substance is formed and can not be easily reversed. A change of metal color when exposed to air for a long time is simply called rusting. This is a chemical change as new substance is formed. This can be seen when Zn roofing sheets changes color over time on exposure to air.
2. Which of the following pairs of reactants will occur most quickly?
(1) sodium chloride and silver nitrate
(3) hydrogen and propene
(2) water and hydrogen chloride
(4) oxygen and methane (CHA)
Answer:
sodium chloride and silver nitrate
Explanation:Movable sodium chloride and silver nitrate 2 IN () solution
The pairs of reactants that will occur most quickly is ) oxygen and methane (CHA)
What occurs when oxygen and methane reacts?When the reaction of oxygen and methane occurs, methane and oxygen are said to undergo combustion and give off carbon dioxide (CO2) and water (H2O).
This is known to be a combustion reaction as it creates a huge amount of heat, that tends to makes it a vital too for production of fuel source. Methane is a known to be a good and efficient greenhouse gas.
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How many zinc atoms are there in 65.4 g?
molar mass of Zn is 65.38 g/mol≅65.4 g/mol
65.4 g Zn* 1 mol Zn/64.4g* (6.022*10^23) atoms/1 mol Zn
hence, there are 6.022*10^23 atoms
An antecedent is a word for which a pronoun is substituted to avoid repetition.
True
False
Explanation:
Antecedent means - prior, preceding, foregoing, previous, former.An antecedent is a word or a part of a sentence that is replaced by a pronoun which helps in repetition.An example of an antecedent is the word “Pankaj” in the sentence: “Pankaj loves his dog.”Another example is -
Khushi bit her lip.Khushi = antecedent; her = personal pronoun.
it is true
because it is true
Which product is the final outcome of a nuclear generating plant? uranium heat electricity steam
Answer:
electricity
Explanation:
i took the test and got the answer right.
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, electricity is the final outcome of a nuclear generating plant.
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. the kinetics of decay of radioactive nuclear decay is of first order kinetics.
The rate law for first order kinetics is
K=(2.303/T)×log(a/a-x)
Where
k - rate constant
t - time passed by the sample
a - initial amount of the reactant
a-x - amount left after the decay process
Electricity is the final outcome of a nuclear generating plant. A nuclear power plant is a thermal power station in which we produce electricity using nuclear reactor.
Therefore, electricity is the final outcome of a nuclear generating plant.
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a sample of sucrose was burned in a calorimeter, and 41,600 joules oh heat energy were released. which statement is true about the water in the calorimeter?
A sample of sucrose was burned in a calorimeter, and 41,600 joules of heat energy were released. and 13,160 joules of heat energy were absorbed by the cold water.
What is sucrose?Sucrose is a disaccharide made of glucose and fructose. It's commonly known as “table sugar” but it can be found naturally in fruits, vegetables, and nuts.
It is known that when mixing hot water with cold water at equilibrium:
The amount of heat released from hot water = the amount of heat absorbed by cold water.
Two bodies of different temperature when come in contact with each other then heat is transferred from hot body to cold body until a thermal equilibrium is maintained between them.
Hence, when hot water has 13,160 joules of energy then this energy will be absorbed by a sample cold water. This means that hot water has released 13,160 joules of energy.
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Answer: It absorbed 41,600 joules.
Explanation: got it right on the test
an acid is added to water. explain what type of bonding may take place
Explanation:
All chemical substances has certain chemical nature that is whether it is :
Acidic Basic NeutralAcidic
It is a substance that in water produce hydrogen ions .
Like HCl ------> H⁺ + Cl⁻
When these kind of ions are released in water , they further combine with water to form hydronium ion that is :
HCl ------> H₃O⁺ + Cl⁻
(hydronium ion)
The bonding in them is a coordinate bond that is : A bond formed between a donor and a acceptor as in it there is no mutual sharing of electrons ,Therefore it is also called as dative bond . The structure of hydronium ion is attached below .
Bases
They are those when dissolved in water produce hydroxide ion .
That is : NaOH-------> Na ⁺ + OH⁻
AgNO3 + Cu=_Cu(NO3)2 + Ag
need help balancing this equation
Answer:
2AgNO3 + Cu = Cu(NO3)2 + 2Ag
Explanation:
This is a simple substitution reaction.
For the equation to be balanced, the total number of elements on each side of the equation must be equal.
The right hand side contains 2 nitrogen and 6 oxygen, to balance this on the left add 2 to the back of silver nitrate. Thus silver on the right hand side of the equation must be 2.
Thus the equation is balanced.
Final answer:
To balance the chemical equation for the reaction between copper and silver nitrate, ensure you have an equal number of atoms for each element on both sides of the equation, resulting in 2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s).
Explanation:
To balance the chemical equation Cu (s) + AgNO3(aq) → Cu(NO3)2 (aq) + Ag (s), follow these steps:
Identify the reactants and products to understand what symbols go on each side of the arrow and where the + signs go.
Write the correct formulas for all compounds and elements, ensuring all ionic compounds are charge balanced.
Balance the equation by ensuring the same number of atoms of each element appears on both sides of the reaction.
Here is the balanced chemical equation:
2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s)
This reaction is an example of a single replacement reaction where silver (Ag) is displaced by copper (Cu). The copper starts as a solid and is oxidized to copper (II) nitrate, while silver nitrate is reduced to solid silver. Remember that the charge conservation is important, and therefore the number of electrons and the total charge must remain equal on both sides of the equation.
The following properties are either physical or chemical. Which one is different from the rest based on those two categories?
Boiling point
Flammability
Magnetism
Thermal conductivity
The property that is different from the rest based on the categories of physical and chemical properties is Boiling point.
Boiling point is a physical property because it is associated with the phase change of a substance from liquid to gas and does not involve a change in the chemical composition of the substance. It is a characteristic of a substance that can be measured at a specific pressure and is used to identify substances.
Flammability is a chemical property because it involves a chemical reaction, specifically combustion, where the substance reacts with oxygen to produce heat and light. This reaction results in the formation of new substances with different chemical compositions.
Magnetism is considered a physical property as it pertains to the behavior of a substance in the presence of a magnetic field. It does not involve a change in the chemical composition of the material.
Thermal conductivity is also a physical property. It measures the ability of a material to conduct heat and is a characteristic that can be measured without changing the chemical identity of the substance.
In summary, boiling point, magnetism, and thermal conductivity are physical properties, while flammability is a chemical property. Boiling point is the one that is different from the rest in terms of the physical and chemical property categories
This is our main source of heat
Answer:
The sun is our main source of heat and light energy. A source is where something comes from. The heat we feel and the light we see here on Earth is mainly from our nearest star, the sun.
Explanation:
Calcium Oxide will react with ammonium chloride to produce ammonia gas, water vapor, and calcium chloride. If only 16.3 g of ammonia is produced from 112 g of calcium oxide and 224 g of ammonium chloride, what is the percent yield?
Answer:
%age Yield = 22.72 %
Explanation:
The balance chemical equation is as follow;
2 NH₄Cl + CaO → 2 NH₃ + CaCl₂ + H₂O
Step 1: Calculate Moles of CaO, NH₄Cl and NH₃;
CaO:
Moles = Mass / M.Mass
Moles = 112 g / 56.07 g/mol
Moles = 1.99 moles of CaO
NH₄Cl:
Moles = Mass / M.Mass
Moles = 224 g / 53.49 g/mol
Moles = 4.18 moles of NH₄Cl
NH₃:
Moles = Mass / M.Mass
Moles = 16.3 g / 17.03 g/mol
Moles = 0.95 moles of NH₃
Step 2: Calculate Limiting reagent as:
According to equation.
2 moles of NH₄Cl reacts with = 1 mole of CaO
So,
4.18 moles of NH₄Cl will react with = X moles of CaO
Solving for X,
X = 4.18 mol × 1 mol / 2 mol
X = 2.09 mol of CaO
This means that none of the given reagent is limiting reagent. They both are almost equal in number of moles.
Step 3: Calculate Theoretical Yield of NH₃ as;
According to equation.
2 moles of NH₄Cl produced = 2 moles of NH₃
So,
4.18 moles of NH₄Cl will produce = X moles of NH₃
Solving for X,
X = 4.18 mol × 2 mol / 2 mol
X = 4.18 mol of NH₃
Step 4: Calculate Percentage Yield as;
%age Yield = Actual Yield / Theoretical Yield × 100
%age Yield = 0.95 mol / 4.18 × 100
%age Yield = 22.72 %
The percent yield of a reaction is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. In this case, it would involve using stoichiometry to calculate the theoretical yield of NH3 from 112 g of CaO, then dividing the actual yield of 16.3 g by the theoretical yield and multiplying by 100.
Explanation:The percent yield of a reaction is calculated by taking the actual yield (the amount actually produced by the reaction) and dividing it by the theoretical yield (the amount that could have been produced under perfect conditions), then multiplying by 100 to get a percentage. In this case, we don't have the theoretical yield, but we know that 16.3 g of ammonia gas was produced from 112 g of Calcium Oxide and 224 g of ammonium chloride.
The reaction between Calcium Oxide and ammonium chloride is: CaO + 2NH4Cl -> 2NH3 + H2O + CaCl2
First, use stoichiometry to calculate the theoretical yield of NH3 from 112 g of CaO. Then, divide the actual yield by the theoretical yield, and multiply by 100 to get the percent yield.
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If a 185-lb patient is prescribed 145mg. What dosage is the patient receiving in mg/kg of his body weight?
Answer:
1.728 mg/kg
Explanation:
First have to convert the patient's weight to kg
1 lb = 0.454 kg
185 lb in kg = 83.9 kg
Then we have to divide the dose per the weight of the patient
145 mg for 83.9 kg = 145/83.9
= 1.728 mg/kg
what is matter made of?
Answer: Positively charged protons, neutral neutrons, and negatively charged electrons.
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The inventor of the Cherokee syllabary was
A)John Ross
b) Sequoyah
c) Tecumseh
Answer:
b) Sequoyah
Explanation:
The Cherokee syllabary is a syllabary invented by Sequoyah in the late 1810s and early 1820s to write the Cherokee language.
If the pressure of a fixed mass of gas is doubled at a constant temperature, the
volume of the gas will be:
1/4 as much.
O twice as much
half as much
the same.
Answer: half as much .hope this helped
Explanation:
Consider the following successive ionization energies of an unknown element (X) in period five of the main group elements (5a). IE1 579 IE2 1814 IE3 3740 IE4 12479 IE5 14840. What is the identity of the unknown X?
Antimony
Explanation:
The element with this ionization energies is antimony, Sb.
This is because the element has 5 ionization energies.
IE1 579
IE2 1814
IE3 3740
IE4 12479
IE5 14840
Ionization energy is the amount of energy required for the removal of an electron in an atom.
Each shell in an atom have their own respective ionization energies that increases as we penetrate into the atom.
An atom with 5 ionization energies suggests that it has 5 shells. Only Antimony in group 5a has five shells because it belongs to the fifth period.learn more:
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Does the bowling ball have more potential energy or kinetic energy just before it hits the ground? Why?
Answer:
Equal
Explanation:
When the bowling ball is first dropped, it has a maximum potential energy but minimum kinetic energy. The height is max, so the potential energy will be greatest. Velocity is 0, so kinetic energy will be 0.
What are 3 ways Venus is more like earth than any other planet
Answer: they’re the almost the same size almost the same mass and made up of the same materials
Explanation:
what is the first element of the periodic table
Answer:
hydrogen
Explanation:
Answer:
hydrogen
Explanation:
Fill in the coefficients that will balance the following reaction:
a0NaC2H3O2 +
a1Fe2O3 →
a2Fe(C2H3O2)3 +
a3Na2O
Answer:
6,1,2,3
Explanation:
Hope this helped!
!!HELP ASAP!! How does temperature affect the rate of a reaction?
A. Increasing the temperature lowers the activation energy of the
reaction.
B. Increasing the temperature increases the concentration of the
reactants.
C. Increasing the temperature decreases the potential energy of the
reactants.
D. Increasing the temperature gives the molecules more kinetic
energy
Answer:
D. Increasing the temperature gives the molecules more kinetic energy.
Increasing the temperature gives the molecules more kinetic energy. Hence, option D is correct.
What is the rate of a reaction?The rate of a reaction is the speed at which a chemical reaction takes place.
Temperature is also known as the average kinetic energy of molecules.
Some atoms used to have sufficient kinetic energy to react, while others do not.
Increasing the temperature indicates that more numbers of molecules will have sufficient kinetic energy to react and reactions will take place more frequently.
Hence, increasing temperature increases the reaction rate.
Thus, option D is correct.
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Find the number of moles in each of the number of representative particles.
a. 1.20 x 102 atoms of P
b. 3.87 x 1021 molecules of AlF;
c. 4.81 x 1014 molecules of NH3
A mole is a measuring unit, but more precisely, it is a quantity. A mole quantifies the quantity of something, just as 12 of something signifies 12 of that item. Avogadro's number is the quantity that makes up 6.022 x 10²³ in a mole, which is the quantity in question.
a. 1.20 x 10²⁵ atoms of PA mole of phosphorus or any other chemical substance consists of 6.022 x 10²³ molecules. Therefore, to determine the amount of moles of phosphorous if you have 1.20x10²⁵ atoms, just divide by Avogadro's number.
(1.20x10²⁵ atoms)/(6.022 x 10²³ atoms/mol) = 19.969 mole.
b. 3.87 x 10²¹ molecules of AlF(3.87 x 10²¹)/(6.022 x 10²³ atoms/mol) = 6.43 X 10⁻³ mole
c. 4.81 x 10¹⁴ molecules of NH3(4.81 x 10¹⁴)/ (6.022 x 10²³ atoms/mol) = 7.98 X 10⁻¹⁰ mole
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