Answer:
2 L
Explanation:
calculate the freezing point of 3.46 gram of a compound X in 160 gram of benzene when a separate sample of X was vaporized it's density was found to be 3.27 gram/liter at 116°c and 773 torr. The freezing point of pure benzene is 5.45°c of Kf=5.1°/m
Answer: The freezing point of 3.46 gram of a compound X in 160 gram of benzene is [tex]4.38^0C[/tex]
Explanation:
The relation of density and molar mass is:
[tex]d=\frac{PM}{RT}[/tex]
where
d = density = 3.27 g/ L
P = pressure of the gas = 773 torr = 1.02 atm (760 torr = 1atm)
M = molar mass of the gas = ?
T = temperature of the gas = [tex]116^0C=(116+273)K=389K[/tex]
R = gas constant = [tex]0.0821Latm/Kmol[/tex]
[tex]M=\frac{dRT}{P}=\frac{3.27g/L\times 0.0821Latm/Kmol\times 389K}{1.02atm}=102.3g/mol[/tex]
The relation of depression in freezing point with molality:
[tex]\Delta T_f=k_f\times m[/tex]
[tex]\Delta T_f[/tex] = depression in freezing point = [tex]T_f^0-T_f[/tex] = [tex]5.45-T_f[/tex]
[tex]k_f[/tex] = freezing point constant = 5.1
m = molality = [tex]\frac{\text {moles of X}}{\text {weight of solvent in kg}}=\frac{3.46\times 1000}{102.3\times 160}=0.21[/tex]
[tex]5.45-T_f=5.1\times 0.21[/tex]
[tex]T_f=4.38^0C[/tex]
Thus the freezing point of 3.46 gram of a compound X in 160 gram of benzene is [tex]4.38^0C[/tex]
From the information contained in the question, the freezing point of the solution is 4.38°C.
The molar mass of the compound can be obtained from;
M = dRT/P
Where;
d = Density of the gas = 3.27 gram/liter
R = molar constant = 0.082 atmL-K-1mol-1
T = Absolute temperature = 389 K
P = pressure = 773 torr or 1.02 atm
M = 3.27 gram/liter × 0.082 atmL-K-1mol-1 × 389 K/1.02 atm
M = 102.3 g/mol
Number of moles of X = 3.46 gram/102.3 g/mol = 0.034 moles
Molality of the solution = Number of moles of solute/ Mass of solution in kilograms = 0.034 moles/0.16 = 0.21 m
Using the relation;
ΔT = K m i
Where;
ΔT = Freezing point depression
K = Freezing constant = 5.1°C/m
m = molality of solution = 0.21 m
i = Van't Hoff factor = 1
ΔT = 5.1°C/m × 0.21 m × 1
ΔT = 1.07 °C
But;
ΔT = Freezing point of pure solvent - Freezing point of solution
Freezing point of solution = Freezing point of pure solvent - ΔT
Freezing point of pure solvent = 5.45°C
Freezing point of solution = 5.45°C - 1.07 °C
Freezing point of solution = 4.38°C
Learn more: https://brainly.com/question/20906233
when telling the steps in a scientific investigation, they should be relayed in such a way that the audience _______ .
Answer: Im pretty sure its C. or can exactly replicate the procedure
Explanation:
Answer:
it's c I took the test on my but
one product is lead iodide. The other product is ___.
Answer:
potassium nitrate
Explanation:
Answer:
Potassium Nitrate
Explanation:
Edge 2021
A brown rabbit is easily hunted and killed in an arctic ecosystem. Which would be expected to appear most often future generations born in the same ecosystem?
A. brown rabbits
B. gray rabbits
C. white rabbits
D. an even mix of brown, gray, and white rabbits
Answer:
D..................ig
Four animals were fleeing from a wildfire. All of them were running at a speed of 30 miles per hour. Which one has the greatest kinetic energy?
A Elephant
B) Dog
© Mouse
D) Ant
Answer: I don’t know lol
Explanation: I am so sorry I thought this was easy
Answer:
Ant.
Explanation:
The dog would be the most frantic, when all are compared at an equal speed of 30 mph. An ant of such strength, has six jointed legs and has an exoskeleton. An Ant of such size(mass) and weight would have take off with better traction too(6 legs). So the Ant would have the greatest kinetic energy. Also it would take turns while fleeing from the wildfire, while running at almost 30 mph while the other animals wouldn't come that close.
It is technically and literally illogical to say an ant can do 30 mph in its regular size.
Dont believe me? Watch ants scurrying away when threatened and taking turns and U-turns. Six legs offer more energy while fleeing by instinct. Literally six legs at 30 mph. Crazy!
A sample of nitrogen in a rigid container that is originally at 25.0°C and 98.0 kpa is heated until the pressure is 177 kpa. What is the final temp in Kelvin, in degrees celsius
The final temp : 538.2 K = 265.2 °C
Further explanationGiven
Temperature : 25 + 273 = 298 K
Initial Pressure = 98 kPa
Final pressure = 177 kPa
Required
The final temp
Solution
Gay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Input the value :
T₂=(P₂.T₁)/P₁
T₂=(177 x 298)/98
T₂=538.2 K
The crack shown in the lithosphere was created by the movement of two or more tectonic plates. What is this crack called
Answer:
The lithosphere is made up of pieces of tectonic plates. These plates are constantly changing and move towards the mantle. Non-stop movement of tectonic plates causes stress on the earth's outermost layer i.e,the crust. When these stresses extends it leads to cause cracks called faults.
Explanation:
Please help me I’m struggling!!
I’ll mark brainliest!!
CHEMISTRY
Answer:
the 4th one
Explanation:
2NACL 2NA + CL2
Answer:
It's B, the previous answer is wrong
Explanation:
For something to be considered mechanical energy what has to happen? This may be the
most important idea to understand about mechanical energy
Answer:
Mechanical Energy - The Physics Classroom
Objects have mechanical energy if they are in motion and/or if they are at some position relative to a zero potential energy position (for example, a brick held at a vertical position above the ground or zero height position). A moving car possesses mechanical energy due to its motion (kinetic energy).
Weather includes such conditions as air pressure, wind, _____, and moisture in the air.
Answer:
Weather includes such conditions as air pressure, wind, temperature , and moisture in the air.
The air at the top of Mount Everest has pressures of 201.0 torr N2, 50.0 torr O2, 2.0 torr Ar, and 0.5 torr CO2. What is the total air pressure at the top of the highest peak in the world? Show all work to receive full credit.
Answer:
The total air pressure at the top of the highest peak in the world is 253.5 torr
Explanation:
The partial pressures of the gases present at the top of Mount Everest are;
Nitrogen, N₂ = 201.0 torr
Oxygen, O₂ = 50.0 torr
Argon, Ar = 2.0 torr
Carbon dioxide, CO₂ = 0.5 torr
By Dalton's law of partial pressure, the total pressure that a mixture of gases exerts is equal to the sum of the partial pressures of the individual gases
Mathematically, the law can be expressed as follows;
Total pressure, P = ∑P[tex]_i[/tex] = P₁ + P₂ + · · ·
From which we have;
The total air pressure at the top of the highest peak in the world, Mount Everest, [tex]P_{Total Mont Everest}[/tex] = The sum of the partial pressures of N₂, O₂, Ar, and CO₂
[tex]P_{Total Mont Everest}[/tex] = 201.0 torr + 50.0 torr + 2.0 torr + 0.5 torr = 253.5 torr
[tex]P_{Total Mont Everest}[/tex] = 253.5 torr = 0.33355263 atmosphere
Therefore, the total air pressure at the top of the highest peak in the world, [tex]P_{Total Mont Everest}[/tex] = 253.5 torr
The total air pressure at the top of the highest peak in the world is 253.5 torr.
What is Dalton's Law?Dalton's law of gases states that total pressure of any mixture of gases is equal to the sum of the partial pressures of individual gases.
Given that,
Partial pressure of Nitrogen gas = 201 torr
Partial pressure of Oxygen gas = 50 torr
Partial pressure of Argon gas = 2 torr
Partial pressure of Carbon dioxide gas = 0.5 torr
Total pressure at the top = 201 + 50 + 2 + 0.5 = 253.5 torr
Hence total pressure is 253.5 torr.
To know more about partial pressure, visit the below link:
https://brainly.com/question/19813237
What steps should you take to respond to an
accident?
Notify the teacher immediately.
Notify the teacher only if the accident was not
your fault
Immediately wash off any chemicals on skin
or eyes with cool running water.
Remain calm and help others remain calm.
Pick up any broken glass and throw it in the
trash.
Answer:
Notify the teacher immediately.
Immediately wash off any chemicals on skin or eyes with cool running water.
Remain calm and help others remain calm.
Explanation:
Just did it on edge
Response to an accident can be made by informing the teacher, washing off chemicals ,being calm and picking of broken glasses.
Thus option A,C,D and E are correct.
What safety precautions are to be followed in laboratory?
While working in labs it is of utmost importance to work carefully while handling chemicals and glassware apparatus. In some unforeseen circumstances where accidents take place while working in labs it should be notified to the authorities immediately.
In case there is a spill of chemicals on skin or eyes it should be immediately washed under running water as the chemical spilled can cause irritation to the skin or eyes.In case of accidents it is advised to remain calm and calm others as well.
If there is a breakage of glassware it should be immediately be thrown away in the trash as the glass can pierce into the skin and cause injury.
To learn more about precautions in laboratories click here:
https://brainly.com/question/10900782
#SPJ2
Helium is a colorless gas that does not react with other elements. Using what you know about valence electrons, which other elements would you expect to have similar properties as Helium? Explain.
Answer:
Neon, Argon, Krypton, Xenon and Radon
Explanation:
The other elements that would be expected to have similar properties as the Helium from the periodic table are the noble gases.
The noble gases are a special group of elements belonging to the last group of the periodic table.
They are called the O group or inert group because elements in this group do not combine with other atoms due to their completely filled outermost shell.
This makes them unreactive and do not readily combine with other atoms.
What is an electron configuration?
Answer:
Electronic configuration, also called electronic structure, the arrangement of electrons in energy levels around an atomic nucleus.
Answer:
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals
Explanation:
:) hope it helps! have a good day
Help me thank you....
Answer:3
Explanation:
it is b
Answer:
The correct answer is . . . "B" .
♡ ( i just got the answer from that other dude- ) ♡
Explanation:
What are the disadvantages of using nonrenewable energy resources?
They are readily available.
They are harmful to the environment.
There is only a certain amount of each source.
They are easy to extract from the earth.
____ NaBr + ____ Ca(OH)2 ___ CaBr2 + ____ NaOH
Answer:
2 NaBr + 1 Ca(OH)2 ---> 1 CaBr2 + 2 NaOH
An independent variable is what you___in an experiment. (There are no selections so please just answer it)
Answer:
Don’t change, keep the same
Explanation:
Which factor can increase the potential energy of an object?
Decrease in speed
Decrease in density
Increase in temperature
Increase in height from the ground
Answer:
Increase in height from the ground.
Explanation:
Potential energy =mass×acceleration due to gravity×height.
P.E= mgh
A compound has an empirical formula of SO3 and a molecular mass of 152. What is the molecular formula?
Answer:
Molecular formula = S₂O ₆
Explanation:
Given data:
Empirical formula = SO₃
Molecular formula = ?
Molecular mass = 152 g/mol
Solution:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = 80 g/mol
n = 152 g/mol / 80 g/mol
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2(SO₃)
Molecular formula = S₂O ₆
Group 13 elements tend to acquire which charge when they form ions?
-3
+5
+3
-5
Answer:
-0
Explanation:
What is the molar volume of a gas at standard temperature and pressure? 1.0L, 2.4L, 11.2L 22.4L
What are the variables for this piston? temperature only temperature and volume pressure and number of molecules volume and number of molecules
Answer:
Option 2: temperature and volume
Explanation:
took the test
Temperature and volume are the variables for this piston.
What is a temperature?Temperature is a measure of hotness or coldness
The volume of a gas is directly proportional to its absolute temperature. More specifically, for a fixed mass of gas at constant pressure, the volume (V) is directly proportional to the absolute temperature (T).
This is Charles' Law. V = kT, where k is a proportionality constant.
Hence, temperature and volume are the variables for this piston.
Learn more about temperature here:
https://brainly.com/question/11464844
#SPJ2
What kind of reaction is shown below?
C8H18 → C2H4 + C6H14
a combustion
b double replacement
c composition
d decomposition
e single replacement
Answer:
d. decomposition
Explanation:
decomposition reaction is a reaction in which a compound breaks down into 2 or more substances.
the general form is: AB → A + B
Explain how scientists know the composition of the bottom layer of the crust?
Ello fellers
A chemical change is also known as a:
1.endothermic reaction
2.exothermic reaction
3.solution
4.chemical reaction
plzz!!! I need help now
this is science
Thallium-208 has a half life of 3.053 minutes. How much of a 78.7g sample is left after 25 minutes?
Answer:
0.31 g
Explanation:
N/No = (1/2)^t/t1/2
N= Amount of radioactive isotope at time t
No= Amount of radioactive isotope originally present
t= time elapsed = 25 minutes
t1/2 = 3.053 minutes
N/78.7 = (1/2)^25/3.053
N/78.7 = (1/2)^8
N/78.7 = 1/256
256 N = 78.7
N= 78.7/256
N= 0.31 g
Under Organic compound
Please draw the structure of this compound
3,3-diethyl-2-methyl heptane?
Answer:
SEE ATTACHMENT- GRADED AT 100%
Explanation:
what evidence is there of energy release after chemical reaction
Answer:
loss of mass
Explanation:
your welcome :)
