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
Why is water considered to be neutral?
A. It has only (H+) in solution.
B. Its (H+) and (OH) are the same.
C. It has only (OH) in solution
D. Its pH + POH =14
b
.................,
......
Answer:
Its [H+] and [OH-] are the same.
Explanation:
i just took the test and got it right
How many moles are in 3.57 x 10^32 particles?
Answer:
3.57e+32
Explanation:
3.57e+32
ammonium nitrate, which is prepared from nitric acid, is used as a nitrogen fertilizer. determine the percent composition of ammonium nitrate
Answer:
Ammonium nitrate, (NH4NO3), a salt of ammonia and nitric acid, used widely in fertilizers and explosives. The commercial grade contains about 33.5 percent nitrogen, all of which is in forms utilizable by plants; it is the most common nitrogenous component of artificial fertilizers.
PLZ HELP THIS IS DUE RN!!!!!! NO ONE IS HELPING ME :(
You hold a 50N bowling ball above your head for 15 minutes. How much work have you done? Why?
9. You run the 100 M race in 15 seconds and your identical twin runs it in 14s. Who did more work? Why?
Answer:
Eght: 0
Explanation:
The work formula is W = F*d where d is displacement (which means the direction matters)
Same amount of work.
Eight
Time does not matter in Work. Force and Distance do.
F = 50 N
s = 0 The only work you have done is move the ball above your head. Thereafter you just held it.
t = 15 but no work is done. Tell your tired muscles that as they try and deal with holding a 5 kg mass above you head.
W = 0
Nine
Again from the last question you should be able to tell that time does not matter. The force is the same for both of you (that's why he's your identical twin).
So the work is the same. You both weigh the same. You both went the same distance.
8
what mechanical weathering process is used when water turns to ice?
Answer:
Frost weathering
Explanation:
Answer:
frost wedging where the water seeps into the cracks of a rock and expands on freezing and making the crack bigger
Explanation:
HELP ASAP!!
Two colorless chemicals combine inside a glow
stick. When the chemicals combine, they produce
brightly colored light. The glow stick's temperature
does not change. (select all that apply)
emission of heat
emission of light
color change
formation of ga
Answer:
Emission of light
color change:)
Explanation:
Answer:
B and C
Explanation:
edge 2021
I just did it
Which of the following reactions is balanced?
A. caC12 + H2C03 2CaC03 + HCI
B. caC12 + caC03 + 2HCl
C. caC12 + 2H2C03 caC03 + HCI
D. 2caC12 + H2C03 cac03 + HCI
Answer:
B. CaCl₂ + H₂CO₃ → CaCO₃ + 2HC
Explanation:
A balanced reaction has the same number of atoms in the both sides of the reaction. In the options:
A. CaCl₂ + H₂CO₃ → 2CaCO₃ + HCI
In this reaction there is 1 Ca in reactants and 2 in products -The reaction is unbalanced-
B. CaCl₂ + H₂CO₃ → CaCO₃ + 2HCl
There is 1 Ca is both sides, 2Cl, 2H, 1C and 3 Oxygens -The reaction is balanced
C. CaCl₂ + 2H₂CO₃ → CaCO₃ + HCI
There is 1 Ca in both sides but 2Cl in reactants and 1 in Cl -The reaction is unbalanced-
D. 2CaCl₂ + H₂CO₃ →CaCO₃ + HCI
There are 2 Ca in reactants and 1 in Ca -The reaction is unbalanced-
3. Meteorologists refer to the water vapor in the atmosphere as
+
O A. humidity
O B. precipitation
O C. condensation
OD. air pressure
I have a project and I need help with a diagram. What do the moon, sun, and earth look like at night in the Americas? (diagram)
Answer: Hope This Helps
Explanation:
How many moles of calcium atoms are in each mole of calcium carbonate?
Answer:
1 mole of calcium, one mole of carbon, and 3 moles of oxygen.
Explanation:
Answer:
You know that one mole of calcium carbonate contains 1 mole of calcium, one mole of carbon, and 3 moles of oxygen. Each mole contains 6.022⋅1023 atoms - this is known as Avogadro's number.
how many atoms are in sodium hydroxide
Answer:6 atoms
Explanation:Each NaOH has one Na and one O and one H. Therefore, 2 NaOH has 6 atoms.
Answer:
Three atoms
Explanation:
Hope this helps
What elements are in water?
1. Hydrogen and Helium
2. Hydrogen and Oxygen
3. Helium and Oxygen
4. Hydrogen and Nitrogen
Answer:
Hydrogen and Oxygen
Explanation:
The chemical equation for water is H20, meaning Hydrogen and 2 oxygen!
A_______ contains specific instructions for making proteins
A- CHROMOSOMES
B- GENE
C- MOLECULES
D- RIBOSOMES
Answer:
D Ribosomes
Explanation:
Answer:
D. Ribosomes
During photosynthesis the chemical bonds between are broken
Answer:
yes they are broken down into smaller units
The image below shows how warm and cool
air moves over Earth
What is this type of air movement called?
A. convection current
B. atmospheric current
C. horizontal air current
D. prevailing surface winds
Answer:
convection current
Explanation:
Calculate the maximum mass of aluminium which can be extracted from 10 kg of
aluminium oxide
2AlO3+ 3C ----->4Al + 3CO2
Answer:
Hrishikesh. bshjsjbd. jwjjja
7 Ba(ClO3)2
How many oxygen atoms are shown?
What is the empirical formula for propane?
Answer:
The empirical formula for propane is C3H8.
Answer:
Because propane is made up of only hydrogen and carbon _ the chemical formula is C3H8..
A parent with freckles is crossed with a parent without freckles. The Punnett square shows the possible genotypes and phenotypes of the offspring. Which statement accurately describes the probability of phenotypes?
Answer: The likelihood of the offspring having freckles and not having freckles is the same.
Explanation:
Freckles are tiny brown spots on your skin, often in areas that get sun exposure. freckles are harmless. They shape as a consequence of melanin overproduction, which is responsible for skin and hair color (pigmentation). Overall, freckles derive from ultraviolet (UV) light stimulation.
Answer:
The likelihood of the offspring having freckles and not having freckles is the same.
Explanation:
just did it
An object at rest has equal forces acting on it. This can be described as a __________ force.
16.
Which of the following elements is a metalloid?
a. As
c. Br
b. Se
d. Kr
Answer:
a. As
Explanation:
Convert 132°F to Celsius.
Answer:
the answer is 55 degrees Celsius
In a DNA molecule, the adenine always pairs with the
Answer:
Adenine always pairs with thymine in a DNAmolecule.
Explanation:
What does the 2 in 2 CO represent?
Answer:
It means there are 2 carbon atoms or 2 molecules of Co(I cant tell by spacing but the 1st one is more likely)
Explanation:
Which of the following best describes
electromagnetic waves?
A. Electromagnetic waves require the presence of a
medium to be able to transfer energy.
B. Electromagnetic waves can transfer energy through
empty space.
C. Electromagnetic waves can only transfer energy though
water.
Answer:
B.
Electromagnetic waves do not require any type of media.
The correct statement is " Electromagnetic waves can transfer energy through".
What is electromagnetic wave?Electromagnetic waves are synchronized vibrations of electric along with magnetic fields that travel across a vacuum at the speed of light. The oscillations of the two fields generate a transverse wave since they are perpendicular to each other and to the direction of energy as well as wave propagation.
What is energy ?The capacity to work is defined as energy. It can take the form of potential energy, kinetic energy, thermal energy, electrical energy, chemical energy, nuclear energy, or any other form.
Therefore, the statement "Electromagnetic waves can transfer energy through" will best describe electromagnetic waves.
Hence, the correct answer will be option (b).
To know more about energy and electromagnetic waves.
https://brainly.com/question/3101711.
#SPJ2
What volume of oxygen (02) gas is equal to 49.5 g 02 gas at STP?
Answer:
The volume of two moles of oxygen at STP is
Assuming that the gas is at standard temperature and pressure (STP), one mole of any gas occupies 22.4 L . This means the number of moles of O2 is 222.4=0.089 mol .
Explanation:
Identify the nervous system responsible for calming the body and conserving energy.
Answer:
The parasympathetic nervous system is responsible for calming the body and conserving energy.
Explanation:
As the body conserves energy, pupils contract, heartbeat slows, blood pressure decreases, and digestion is stimulated.
It functions to restore homeostasis and is active when the body is at rest and recuperating.
please help me please
I think it is A,C,D hope this helps:)
God Bless
how many moles of Al2O3 will be produced if 1.35 moles of Fe are produced?
Answer:
0.675 mol
Explanation:
Step 1: Write the balanced equation
2 Al + Fe₂O₃ ⇒ 2 Fe + Al₂O₃
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of Fe to Al₂O₃ is 2:1.
Step 3: Calculate the moles of Al₂O₃ produced when 1.35 moles of Fe are produced
We will use the established molar ratio.
1.35 mol Fe × 1 mol Al₂O₃/2 mol Fe = 0.675 mol Al₂O₃
A sample of hydrogen gas at a pressure of 0.926 atm and a temperature of 29.5 C, occupies a volume of 457 mL. If the gas is allowed to expand at constant temperature until its pressure is 0.447 atm, the volume of the gas sample will be ___ mL.
Answer:
V₂ = 946.72 mL
Explanation:
Given data;
Initial pressure = 0.926 atm
Initial volume = 457 mL
Temperature = constant = 29.5°C
Final pressure = 0.447 atm
Final volume = ?
Solution:
The given problem will be solved through the Boyle's law,
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
by putting values,
P₁V₁ = P₂V₂
0.926 atm × 457 mL = 0.447 atm × V₂
V₂ = 423.18 atm. mL/ 0.447 atm
V₂ = 946.72 mL
