Answers
Answer:
the heat absorbed on dissolving 1 g of salt = 1028.13 J
Explanation:
given data
salt dissolve = 6.7 g
water dissolve = 52.1 mL
heat = 6888.5 J
solution
when you dissolve 6.7 g of salt then heat absorbed = 6888.5 J
and
if dissolve 1 g of salt then heat absorbed = (6888.5 J ÷ 6.7 g) × 1 g
if dissolve 1 g of salt then heat absorbed = 1028.13 J
so that
the heat absorbed on dissolving 1 g of salt = 1028.13 J
Related Questions
which of the constructor specifications below will allow this code to behave as desired? group of answer choices a. public geometricsequence geometric sequence(double initial, double mult) b. public geometricsequence init(double initial, double mult) c. public geometricsequence(double initial, double mult) d. public void geometricsequence(double initial, double mult)
Answers
The constructor specifications below will allow this code to behave as desired
d. public void geometricsequence(double initial, double mult)
Methods can return a value to the caller. If the return type (the type listed before the method name) is not void , the method can return the value by using the return statement.
The loan amount, interest rate, future value, and number of periods are the four factors for this approach. The first three are integers, and the fourth is a double-precision floating point value. A value may be returned to the caller by a method. The method can return the value by using the return statement if the return type, which is the type specified before the method name, is not void. The method caller will receive the value if the return keyword is used in a statement and it is followed by a value that corresponds to the return type. A new object with variables declared as in the class is returned by the constructor. Static variables are duplicated just once, whereas instance variables are created from scratch.
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4.08g of iron(II) chloride is dissolved in 50. mL of a 0.60 M aqueous solution of silver nitrate. Calculate the final molarity of chloride anion in the solution. you can assume the volume of the solution doesn't change when the iron(II) chloride is dissolved in it.
Answers
The final concentration of the chloride ions is 0.32 M.
What is the final molarity of the chloride ion?We know that we have to obtain the number of moles of the iron II chloride that was reacted in the solution and then we would have;
Number of moles of iron II chloride = 4.08g /127 g/mol = 0.032 moles
Given the fact that there are two chloride ions hence the amount of the chloride ions is 0.016 moles
The concentration of the silver nitrate = 50/1000 * 0.60 M
= 0.03 moles
Thus we would have a final concentration of 0.016 moles/ 0.05
= 0.32 M
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C6H12O6 + 602 → 6CO2 + 6H₂O
The most efficient ratio is
1 C6H12O6 6 02.
Which set of reactants will be the most
efficient (least wasteful of materials) for
the reaction?
A. 1.0 mol C6H12O6 and 3.0 mol O₂
B. 1.5 mol C6H₁2O6 and 3.0 mol O₂
C. 3.0 mol C6H₁2O6 and 6.0 mol O₂
D. 0.5 mol C6H₁2O6 and 3.0 mol O₂
Answers
Answer:
D
Explanation:
The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.
The following reaction take place in a container where CONDITIONS ARE NOT STP! Calculate the volume nitogen dioxide that will be produced when 4,86 dm3 N2O5 decompose. 2N2O5(g) → 4NO2(g) + O2(g)
Answers
9.77 litres of NO2 are generated on average.
Calculation-The balanced equation for the breakdown of N2O5 is as follows:
\(2N_2O_5(g) -- > 4NO_2(g) + O_2(g)\)
determine how many moles of N2O5 decompose:
\(V(N_2O_5) / Vm = n(N_2O_5)(N_2O_5)\)
where V(N2O5) = 4.86 dm3 is N2O5's volume and Vm(N2O5) is N2O5's molar volume under the circumstances stated in the ideal gas law:
\((R*T)/P = Vm = V/n\)
when the gas constant R is used.
the kelvin scale of temperature, T
The pressure is P.
The ideal gas law:
\(n(N_2O_5) = V(N2O5) / Vm(N_2O_5) = 4.86 dm3 / (24.46 L/mol) = 0.1982 mol\)
the number of moles of NO2 is:
\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)
then,
\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)
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Ammonium chloride is produced in the thermochemical equation NH3 (g) + HCl (g) → NH4Cl (s) ΔH = –176 kJ.
How many moles of NH4Cl have been produced if the change in enthalpy is –528 kJ?
Answers
Answer:
3 moles of NH₄Cl
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
NH₃(g) + HCl(g) → NH₄Cl(s) ΔH = –176 kJ
From the balanced equation above,
1 mole of NH₄Cl where obtained when the change in enthalphy (ΔH) was –176 kJ.
Finally, we shall determine the number of mole of NH₄Cl produced when the change in enthalphy (ΔH) is –528 kJ. This can be obtained as follow:
From the balanced equation above,
1 mole of NH₄Cl where obtained when the change in enthalphy (ΔH) was –176 kJ.
Therefore, Xmol of NH₄Cl will be obtained when the change in enthalphy (ΔH) is –528 kJ i.e
Xmol of NH₄Cl = –528 / –176
Xmol of NH₄Cl = 3 moles
Thus, 3 moles of NH₄Cl where obtained from the reaction.
If a chemist wishes to produce 500 mL of 2.0 M HCl, how much concentrated 12 M HCl should he measure out? (dilution problem)
Answers
To solve the dilution problem, we can use the formula:
C₁V₁ = C₂V₂
Where:
C₁ is the initial concentration,
V₁ is the initial volume,
C₂ is the final concentration, and
V₂ is the final volume.
Given:
C₁ = 12 M (concentration of the concentrated HCl),
V₂ = 500 mL (final desired volume),
C₂ = 2.0 M (final desired concentration).
Let's solve for V₁:
C₁V₁ = C₂V₂
(12 M)(V₁) = (2.0 M)(500 mL)
Cross multiplying:
12V₁ = 2.0 × 500
12V₁ = 1000
V₁ = 1000 / 12
V₁ ≈ 83.33 mL
Therefore, the chemist should measure out approximately 83.33 mL of concentrated 12 M HCl to produce 500 mL of 2.0 M HCl.\(\)
A 3D representation of a cyclohexane ( C6H12 ) molecule, a cyclic compound used in the manufacture of nylon and found in the distillation of petroleum, is shown.
Name the geometry around each carbon atom.
What is the hybridization of each carbon atom?
a) sp2
b) sp3d2
c) sp3
d) sp3d
e) sp
Answers
The carbon atoms that are in the compound shown are all sp2 hybridized.
What is cyclohexane?We have to note that the compound cyclohexane is one of the compounds that belong to the category of the compounds that we call the cycloalkanes. The imnplication of this is that the compound would have a cyclic structure.
Each of the compounds in this group would have the carbon atoms that are in the ring to have a trigonal planar geometry and they would be sp2 hybridized and the sprain on the ring would depend on the ring size.
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What is the function of a cell wall
(A) to protect and support the cell
(B) to perform different functions in each cell
(C) to prevent water from passing through the cell
(D) to prevent oxygen from entering the cell
Answers
Answer:
the answer is A to protect and support the cell
Answer:
A)
Explanation:
i need help please help me now please
Answers
what is it called when the mass of atoms found in nature is determined by measuring the masses of the elements combined in chemical compounds, a large number of atoms must be used to make the measurement.
Answers
Answer:
This process is called mass spectrometry. In mass spectrometry, a sample is ionized, typically by bombarding it with high-energy electrons, and the resulting ions are separated based on their mass-to-charge ratio. The mass of the ions can be measured using a mass spectrometer, and this allows the determination of the atomic masses of the elements present in the sample. To obtain accurate results, it is generally necessary to measure the masses of a large number of atoms, as the precision of the measurement increases with the number of atoms that are measured
Explanation:
How many grams are of aluminum nitrate are contained in 0.150 moles of Al(NO3)3?
Answers
Answer:
31.95 g
Explanation:
find the molar mass of Al(NO3)3
(Al = 27, N = 14, O = 16)
molar mass of Al(NO3)3 = 27+ (14+16×3)×3
= 213 gmol^-
mass = 213 ×0.15
= 31.95g
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
A 3.69 g
sample of a compound consisting of carbon, hydrogen, oxygen, nitrogen, and sulfur was combusted in excess oxygen. This produced 2.08 g
CO2
and 1.28 g
H2O
. A second sample of this compound with a mass of 4.65 g
produced 4.77 g
SO3
. A third sample of this compound with a mass of 8.62 g
produced 3.48 g
HNO3
. Determine the empirical formula of the compound. Enter the correct subscripts on the given chemical formula.
Answers
The empirical formula of the compound is C₂H₁₆S₂N₃O.
What is the empirical formula of the compound?The moles of each element is as follows::
For CO₂:
Carbon (C) has a molar mass of 12.01 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of C in CO₂ = 2.08 g / 12.01 g/mol = 0.173 moles
Moles of O in CO₂ = 2.08 g / 16.00 g/mol = 0.130 moles
For H₂O:
Hydrogen (H) has a molar mass of 1.01 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of H in H₂O = 1.28 g / 1.01 g/mol = 1.27 moles
Moles of O in H₂O = 1.28 g / 16.00 g/mol = 0.080 moles
For SO₃:
Sulfur (S) has a molar mass of 32.06 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of S in SO₃ = 4.77 g / 32.06 g/mol = 0.149 moles
Moles of O in SO₃ = 4.77 g / 16.00 g/mol = 0.298 moles
For HNO₃:
Hydrogen (H) has a molar mass of 1.01 g/mol.
Nitrogen (N) has a molar mass of 14.01 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of H in HNO₃ = 3.48 g / 1.01 g/mol = 3.45 moles
Moles of N in HNO₃ = 3.48 g / 14.01 g/mol = 0.248 moles
Moles of O in HNO₃ = 3.48 g / 16.00 g/mol = 0.217 moles
The simplest whole-number ratio of the elements will be:
Carbon: 0.173 moles / 0.080 moles ≈ 2.16
Hydrogen: 1.27 moles / 0.080 moles ≈ 15.88
Sulfur: 0.149 moles / 0.080 moles ≈ 1.86
Nitrogen: 0.248 moles / 0.080 moles ≈ 3.10
Oxygen: 0.080 moles / 0.080 moles = 1
Therefore, the empirical formula is C₂H₁₆S₂N₃O.
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1. The two products obtained in this experiment are 1-methylcyclohexene and 3-methylcyclohexene. Why was 2-methylcyclohexene not mentioned as a possible product
Answers
The numbering of the compound which gives the methyl substituent the lowest number is 1-methylcyclohexene and 3-methylcyclohexene and not 2-methylcyclohexene.
In the reaction, the substrate is 2-methyl cyclohexanol. The reaction that takes place here is a dehydration reaction. In the reaction, the acid first protonates that -OH group to form water which is a good leaving group.
A carbocation is now formed and abstraction of hydrogen could occur at carbon number 1 or 3 and the numbering of the compound which gives the methyl substituent the lowest number is 1-methylcyclohexene and 3-methylcyclohexene and not 2-methylcyclohexene.
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1. List four places water can be stored on Earth.
Answers
Answer:
On the landscape, freshwater is stored in rivers, lakes, reservoirs, and creeks and streams. Most of the water people use everyday comes from these sources of water on the land surface.
Answer:
On the landscape, freshwater is stored in rivers, lakes, reservoirs, and creeks and streams. Most of the water people use everyday comes from these sources of water on the land surface.
draw a well-labelled diagram showing how your body digests food
Answers
i too used it
i thought it will help
nice time. .....
Explanation:
...................
The following initial rate data are for the reduction of nitric oxide with hydrogen: 2 NO + 2 H2N2 + 2 H2O Experiment [NO]o, M [H2]o, M Initial Rate, M s-1 1 0.167 0.210 8.38×10-3 2 0.334 0.210 3.35×10-2 3 0.167 0.420 1.68×10-2 4 0.334 0.420 6.70×10-2 Complete the rate law for this reaction in the box below. Use the form k[A]m[B]n , where '1' is understood for m or n and concentrations taken to the zero power do not appear. Don't enter 1 for m or n. Rate = From these data, the rate constant is M-2s-1.
Answers
The complete rate law should be like: Rate = k[NO][H2]^2
Rate = k[NO]^x[H2]^y, where x and y are the exponents for the concentration of nitric oxide (NO) and hydrogen (H2) respectively.
The rate law can be determined by performing experiments with different initial concentrations of NO and H2 and observing how the initial rate changes.
From the data provided,
It can be seen that increasing the concentration of NO by a factor of 2 results in an increase in the initial rate by a factor of 2^(x).
Similarly, increasing the concentration of H2 by a factor of 2 results in an increase in the initial rate by a factor of 2^(y).
Based on this information, x = 1 and y = 2 can be determined, giving us the rate law:
Rate = k[NO][H2]^2
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What is the core of the earth called?
Answers
Answer:
inner core
Explanation:
We know that potential energy is the stored energy in an object. In a stretched rubber band or compressed spring that stored energy is due to the objects tendency to return to its original shape, we call that elastic potential energy. What do you call the type of potential energy invested in an object by lifting it against the force of gravity?
Question 1 options:
power
gravitational potential energy
law of conservation of energy
ground energy
Answers
Answer:
gravitational potential energy
Explanation:
i just did it
What is Scientific definition of a compound?
Answers
A substance made up of atoms from two or more elements that are chemically bonded together
What are the possible values of 1 and m for
n=4 ?
Answers
Answer:
If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?
Is reacting sodium metal with water a physical or chemical change
Answers
\(\boxed{\boxed{\pink{\bf \leadsto This \ is \ an \ example \ of \ Chemical \ change .}}}\)
Explanation:Reaction of sodium metal with water is a chemical change . Sodium reacts with water to form sodium hydroxide. This is also an example of exothermic reaction as heat is released in this process. Sodium reacts vigoursly with water , it even reacts with the moisture present in the air . So it is stored in kerosene oil .
The reaction of sodium with water is :-
\(\boxed{\red{ \bf \underset{\blue{Sodium}}{2Na} + \underset{\blue{Water}}{2H_2O} \longrightarrow \underset{\blue{Sodium\: Hydroxide}}{2Na(OH)}+ \underset{\blue{Hydrogen}}{H_2}}}\).
The reaction of sodium metal with water is a chemical change, as a result formation of sodium hydroxide occurs.
A Chemical change is any change that occurs to substances which when combine to form a new substance or decompose to form new substances. Here there occurs an internal consistency of the matter involved in that particular change.A physical change is a change with involves the changes in the size, shape, texture, etc. of any substance.The following points to be noted for the reaction of sodium with water:
The sodium reacts with water to give sodium hydroxide.The presence of the single outermost electron (3s1) in sodium makes the metal highly reactive.This is a chemical change which is an exothermic reaction, which means the reaction results in the liberation of heat during the process.Sodium is a very highly reactive metal, which can even react with moisture present in the air.To avoid any unnecessary reactions, sodium is stored in kerosene, where it seems to be inert.Therefore, the reaction of sodium with water is a chemical change.
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If the balanced chemical reaction for the formation of Li2O is 4 Li(s) + O2(g) → 2 Li2O(s), how many molecules of Li2O(s) would you produce if you used up 6 atoms of Li(s)?
Answers
The molecules of Li₂O that would produce if you used up 6 atoms of Li(s) is 3.
What is Lithiumdioxide?It is an unstable inorganic and radical compound, used in the manufacture of glass and ceramic.
The balanced equation
\(\rm 6 Li(s) + O_2(g) \rightarrow 3 Li_2O(s)\)
If the atoms of lithium moves up to 6 the lithium oxide molecules will be 3, as you can see in the equation.
Thus, the molecules of Li will be 3.
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Which of the following diagrams is the correct electron dot diagram for Al?
Answers
Answer:
D)
Explanation:
Aluminum has 3 valence electrons; therefore, there should only be 3 separate dots.
The correct electron dot diagram for Aluminium (Al) is option D.
The electron dot diagram is used to to represent the valence electrons of an element.
This can also be called the Lewis dot formulas.
The Al represents the element, Aluminium, which falls under group 3 of the periodic table.
This simply means that it has 3 Valence electrons in its outermost shell.
Also, valence electrons are those electrons that are located at the outer most shell of an atom which can be donated or shared during a chemical reaction.
Therefore, the diagram that represents the electron dot diagram for Al is D because it contains 3 dots which signifies the valence electrons of Al.
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Suppose I1 = 225, I2 = 335 I3 = 2000 units and I4= 2200 units. How many valence electrons are in the creature ?
Answers
Valence electrons are electrons found in the valence shell of atoms and they determine the reactivity of the atom.
What are valence electrons?Valence electrons refers to the electrons which are found in the outermost or valence shell of atoms.
Electrons are easily removed or added to the valence shell of atoms.
Therefore, valence electrons determine the reactivity of atoms.
This implies that atoms with few or almost full valence electrons are very reactive.
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A science teacher is planning a science lab in which students will identify conditions that do and do not speed up the time required for
sugar to dissolve in water. Which of the following conditions will NOT have an effect on the dissolving time?
B. stirring the water
D. magnetizing the sugar
E grinding the sugar
of heating the water
Answers
Answer: E
Explanation:
Question (1 point)
Given the model, answer the following questions regarding effusion. The orange spheres have a greater root-mean-square speed than the blue spheres. Assume the balloon has a tiny opening for gas molecules to escape.
1st attempt
Part 1 ( 0.5 point)
See Periodic Table See Hint
Which balloon, A or B, most accurately illustrates the effusion of a gas from the central balloon?
Calculate the relative rate of effusion for the orange to blue spheres. The root-mean-square speed for the orange spheres is 495.0m/s. The root-meah-5quare speed for the blue spheres is 380.0m/ s.
Answers
According to the claim, Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303. (orange is 1.303 times more effused than blue).Relative rate of effusion for the orange to blue spheres = 1.531.
What is effusion ?The process of effusion is when a gas escapes from a container through a hole that is significantly smaller in diameter than the molecules' mean free path.
Gas molecules flow through a small opening in one container and into another by effusion. Graham's law allows rates of effusion to be compared at the same temperature. Diffusion is the random molecular motion-based movement of gas molecules through one or more other types of gas.
Rate of effusion of Orange / Rate of effusion of blue
= [Mblue / Morange]^1/2
Vrms = sqrt [(3RT/M)]
Vorange / Vblue = [ Mblue / Morange]^1/2
Rate of effusion of Orange / Rate of effusion of blue
= 565/ 369
= 1.531
Thus, Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303.
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Injuries can also provide a blank of the suspect
Answers
Moreover, injuries may offer a hint or description of the culprit. The type and location of the injury may give away information about the suspect's physical attributes, such as height, weight, or age.
What do the injuries provide?Injuries can also reveal the suspect's method of operation, including whether they are right- or left-handed or if they used a certain kind of tool or weapon. To learn as much as they can about the crime and the parties involved, it is crucial for detectives to thoroughly examine any wounds that victims or suspects may have left behind.In forensic science, injuries can play a significant role in establishing the cause and manner of death or in locating the criminal. Investigators may be able to better understand the circumstances around a crime and recreate what actually happened with the help of the location and type of injury. Furthermore, the existence or absence of injuries can be used to support or refute witness accounts and other pieces of evidence.learn more about forensic science here
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Marcar la alternativa correcta en relación a desplazamiento y la distancia
Answers
Answer A
Explanation:
Some people have two eggs for breakfast. Which of these causes a chemical change to the eggs?
A. Cooking the eggs
B. Breaking the eggs
C. Stirring the raw eggs together
D. Putting salt and pepper on the eggs
Answers
Answer:
the answer is A. cooking the eggs
Answer:
A. Cooking the eggs
Explanation:
Cooking the eggs is a chemical change because it's a permanent change. There's no way to get the eggs back in its original form as an egg. Breaking the egg, stirring the egg, or even putting spices on the eggs are all examples of physical changes because they don't change the eggs' chemical composition. They only change its appearance.