How much energy would be released as 95.0 g of acetic acid crystallized?
Answer:
-18.54kJ of energy would be released
Explanation:
The enthalpy of crystallization is defined as the heat released when 1 mole of a substance change its state from liquid to solid. The ΔHcrystallization of acetic acid is -11.72kJ/mol (ΔHcrystallization = - ΔHfusion).
To solve this question we must convert the mass of acetic acid to moles in order to find the heat released:
Moles acetic acid -Molar mass: 60.052g/mol-:
95.0g * (1mol / 60.052g) = 1.58 moles
Heat released:
1.58 moles * (-11.72kJ/mol) =
-18.54kJ of energy would be releasedQuestion 2/8
From left to right across the second period of the periodic table,
Answer:
HE
Explanation:
HE is a noble gas
why is nitrogen used for storage of semen in artificial insemination
Answer:
Explanation:
Nitrogen is use to store semen for artificial insemination because if it's inert characteristics which it help to maintain the semen inertness and also it maintain the low temperature of the semen which is good for it's quality.
Nitrogen also help to prevent it's biological deterioration thereby maintaining it's viability and effectiveness.
What is matter?
O A. Anything that can be seen.
O B. Anything that can be treasured
O C. Anything that takes up space and has mass
B. Anything that has
energy and motion
Answer:
Anything that takes up space and has mass
Label the marrow, spongy bone, and cortical bone on this bone image.
Explanation:
this is the correct answer
just down of compact bone there is spongy bone
mark me
Most synesthetes are:
a.
women
b. men
C. children
d. artists
Please select the best answer from the choices provided
Ο Α
B.
С
D
Answer:
d
Explanation:
its artist school kills artists
Answer:
Hello There!!
Explanation:
The answer is D.artists because they trigger colors.
hope this helps,have a great day!!
~Pinky~
How many moles of aluminum oxide will be produced from 0.50 mol of oxygen?
4 Al + 3 O2→ 2 Al2O3
Answer:
[tex]\boxed {\boxed {\sf \frac {1}{3} \ mol \ Al_2O_3 \approx 0.34 \ mol \ Al_2O_3}}[/tex]
Explanation:
We will use stoichiometry to solve this problem. The reaction given has a formula of
[tex]4Al+3O_2 \rightarrow 2Al_2O_3[/tex]
The coefficients tell us the number of moles necessary for the reaction.
The reaction requires 3 moles of oxygen to produce 2 moles of aluminum oxide. We can make a ratio.
[tex]\frac {3 \ mol \ O_2}{ 2\ mol \ Al_2O_3}}[/tex]
Since we are doing the reaction with 0.5 moles of oxygen, we multiply the ratio by that number.
[tex]0.5 \ mol \ O_2 *\frac {3 \ mol \ O_2}{ 2 \ mol \ Al_2O_3}}[/tex]
Flip the ratio so the moles of oxygen cancel each other out.
[tex]0.5 \ mol \ O_2 *\frac {2 \ mol \ Al_2O_3}{ 3 \ mol \ O_2}}[/tex]
[tex]0.5 *\frac {2 \ mol \ Al_2O_3}{ 3 }[/tex]
[tex]\frac {1 \ mol \ Al_2O_3}{ 3 }[/tex]
[tex]\frac {1}{3} \ mol \ Al_2O_3 = 0.33333 \ mol \ Al_2O_3 \approx 0.34 \ mol \ Al_2O_3[/tex]
0.5 moles of oxygen produces 1/3 or approximately 0.34 moles of aluminum oxide.
Lemon and Orange contains Limonene. What difference they have from the angle of
stereo chemistry? Describe by drawing their structures?
Comprehension Questions:
1. Changing location
change an
object's mass. (does/does not)
O
does
O does not
Answer:
It does not change and object's mass
What is the independent variable in this experiment? (Look at the photo)
Answer:
A) Temperature
Explanation:
The independent variable is the variable that the researcher changes. In this case, that's the temperature because there is hot, warm, and cold.
The food dye is the constant.
The water and time it takes for dye to mix are the dependent variable since they depend on the independent variable (the temperature)
You have 4.5 x 10^24 particles of C3H8. How many grams are present?
Answer:
33 g.
Explanation:
Hello there!
In this case, for these particle-mole-mass relationships problems, it is necessary for us to recall the following equivalence statement, based off the molar mass of the involved compound, C3H8, one mole of particles and the Avogadro's number:
[tex]1mol=44.11g=6.022x10^{23}molecules[/tex]
In such a way, we can set up the following expression for the calculation of the mass in the given particles of propane:
[tex]4.5x10^{23}molecules*\frac{1mol}{6.022x10^{23}molecules} *\frac{44.11g}{1mol}\\\\33g[/tex]
Best regards!
Using 1.8x10-5 for the Ka for acetic acid, along with the weight of sodium acetate and volume of acetic acid used to prepare the buffer, calculate the expected pH of the buffer. Show your work for full credit. How well does it compare to the observed value
Answer:
pH = 4.95
Explanation:
The buffer was created using 4.0082g sodium acetate, mixed with 10.0 mL of 3.0 M acetic acid and 90 mL of deionized water.
Using H-H equation for acetic buffer:
pH = pKa + log [Acetate] / [Acetic acid]
Where pH is the pH of the buffer
pKa = -log Ka = 4.74
[] Are molar concentration of each specie -The volume of the solution is 100mL = 0.1L-:
[Sodium acetate] = 4.0082g * (1mol / 82.03g) = 0.04886 moles / 0.1L
= 0.4886M
[Acetic acid] = 3.0M * (10mL / 100mL) = 0.300M
pH = 4.74 + log [0.4886M] / [0.300M] =
pH = 4.95
why Bohr's theory was inadequate?
All of the following are symptoms of someone having a dissociative disorder except
A. memory loss
B. increased energy
C. distorted perception
D. blurred sense of identity
The symptoms of someone having a dissociative disorder are memory loss, distorted perception and a blurred sense of identity except the increased energy.
What is dissociative disorder?Dissociative disorders are having problems with memory, identifying a person, emotion, perception, behavior changes, and sense of self. It can disrupt mental functioning completely.
Examples of dissociative disorder symptoms are the experience of detachment and loss of memory.
The given examples are all the symptoms of dissociative disorder except the increased energy.
Learn more about dissociative disorder.
https://brainly.com/question/4566966
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_____________refers to the soil that is frozen solid all year round, and does not even melt in the summer.
Use this website to answer the question: https://thewildclassroom.com/biomes/artictundra-2/
Question 5 options:
verglas
glaze
permafrost
frost
Answer:
Permafrost is any part of the ground that remains completely frozen or colder
The volume of a 1.00-mole sample of an ideal gas will decrease when the
1.
pressure decreases and the temperature decreases
2.
pressure decreases and the temperature increases
3.
pressure increases and the temperature decreases
4.
pressure increases and the temperature increases
Answer:
The correct option is (3).
Explanation:
The ideal gas equation is given by :
[tex]PV=nRT\\\\V=\dfrac{nRT}{P}[/tex]
The pressure of ideal gas is directly proportional to temperature and inversely proportional to its volume.
We can say that the volume of a 1.00-mole sample of an ideal gas will decrease when the pressure increases and the temperature decreases.
The volume of the idea gas decrease when pressure increases and the temperature decreases. Thus option C is correct.
The ideal gas equation can be given as:
PV = nRT
The equation in terms of pressure and temperature when n=1 can be written as:
Volume = [tex]\rm \dfrac{RT}{P}[/tex]
Accordingly, the volume has been directly proportional to the temperature and has been inversely proportional to the pressure.
Thus, with the decrease in volume, there has been an increase in pressure and a decrease in temperature.
Thus, option C is correct.
For more information about the ideal gas, refer to the link:
https://brainly.com/question/8711877
what is the answer to this question?
Answer:
A
Explanation:
According to Charles Law, volume is directly proportional to absolute temperature so because temperature is being decreased in this case, the volume will also decrease.
How many oxygen atoms are in 3.30 g of quartz?
Answer:
3.30 gSiO2 / 60.085g SiO2 x 2 mol 0 / 1 mol SiO2 x (6.022*1023 ) = 6.61*1022 O atoms
Explanation:
A gas with a volume of 4.0 L at a pressure of 0.9 atm is allowed to expand until the pressure drops to 0.20 atm. What is the new volume?
Answer: 25
Explanation:
The new volume will be 18 L
What is volume?The volume of a dry gas of a given mass was inversely proportional to its pressure at constant temperature, according to Boyle's law. At moderate pressures and temperatures, most gases behave like ideal gases.
Calculation of new volume is shown as below:
The new volume of can be calculated by using Boyle's law.
[tex]P_{1} V_{1} = P_{2} V_{2}[/tex]
It is given that, [tex]P_{1}[/tex] = 0.9 atm. [tex]V_{1}[/tex] = 4 L, [tex]P_{2}[/tex] = 0.20 atm
Now, put the values of given data in above equation.
[tex]V_{2}[/tex] = [tex]P_{1}V_{1}[/tex] / [tex]P_{2}[/tex].
[tex]V_{2}[/tex] = (0.9) ×4 / 0.20
= 3.6 / 0.20
= 18 L
therefore, the new volume will be 18 L.
To know more about volume.
https://brainly.com/question/2098026.
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______ is the movement of sediment from one place to another
Answer:
ErosionExplanation:
Erosion is the movement of sediment from one place to another. Erosion is the mechanical process of wearing or grinding somethin down. It condition in which the earth’s surface is worn away by the action of water and wind.
Therefore, the final answer is Erosion.
The initial pressure of 0.31 moles of gas in a drum is 742 torr. If gas is added to the drum and the final pressure is 759 torr, how many moles of gas are in the drum? Hint: for this problem, you do not have an equation in the Introduction section, but based on the relationship between pressure and volume, what can you determine about the relationship between pressure and the number of moles?
Answer:
0.32 mole
Explanation:
From the question given above, the following data were obtained:
Initial mole (n₁) = 0.31 mole
Initial pressure (P₁) = 742 torr
Final pressure (P₂) = 759 torr
Final mole (n₂) =?
The final mole of the gas in the drum can be obtained as follow:
P₁/n₁ = P₂/n₂
742 / 0.31 = 759 / n₂
Cross multiply
742 × n₂ = 0.31 × 759
742 × n₂ = 235.29
Divide both side by 742
n₂ = 235.29 / 742
n₂ = 0.32 mole
Thus, the final mole of the gas in the drum is 0.32 mole
1. State how increasing the temperature of a gas changes its volume, assuming pressure is held
constant.
Explanation:
the volume and temperature of a gas have a ditect relationship,as the temperature increases the volume also increases when pressure is held constand, heating the gas increases the kinetic energy of the particles or atoms,causing the gas to expand until the pressure returns to its original value
Help I do not understand.
Answer:
158.5g Zn are produced
Explanation:
To solve this question we have to find the moles of Aluminium. With the moles of Aluminium and the balanced reaction we can find the moles of Zn and its mass as follows:
Moles Al -Molar mass: 26.98g/mol
43.6g Al* (1mol/26.98g) = 1.616 moles Al
Moles Zn:
1.616 moles Al * (3mol Zn / 2mol Al) =
2.424 moles Zn are produced
Mass Zn -Molar mass: 65.38g/mol-
2.424 moles Zn * (65.38g / mol) =
158.5g Zn are producedA water treatment tablet contains 20.0 mg of tetraglycine hydroperiodide, 40.0% of which is available as soluble iodine. If two tablets are used to treat 1.00 liter of drinking water, what is the concentration in ppm of iodine in the treated water
Answer:
[tex]16\ \text{ppm}[/tex]
Explanation:
Mass of one tablet = 20 mg
Mass of two tablets = [tex]2\times 20=40\ \text{mg}[/tex]
Percent that is soluble in water = 40%
Mass of tablet that is soluble in water = [tex]0.4\times 40=16\ \text{mg}[/tex]
So, mass of solute is [tex]16\ \text{mg}[/tex]
Density of water = 1 kg/L
Volume of water = 1 L
So, mass of 1 L of water is [tex]1\times 1=1\ \text{kg}=1000\ \text{g}[/tex]
PPM is given by
[tex]\dfrac{\text{Mass of solute}}{\text{Mass of solvent}}\times 10^6=\dfrac{16\times 10^{-3}}{1000}\times 10^6\\ =16\ \text{ppm}[/tex]
Hence, the concentration of iodine in the treated water [tex]16\ \text{ppm}[/tex].
How are nuclear fission and nuclear fusion similar?
A. Both processes combine smaller nuclei into larger nuclei.
B. Both processes convert mass into energy.
C. Both processes are used to produce electrical power.
D. Both processes occur in stars.
Answer:
C. Both processes convert mass into energy.
What is the hybridization of the central atom in CO2? Hybridization = What are the approximate bond angles in this substance? Bond angles = fill in the blank 2
Answer:
sp
Explanation:
Hybridization is the combination of atomic orbitals to yield equivalent hybrid orbitals of appropriate energy which can participate in bonding.
In every compound there is a central atom. The central atom is usually the least electronegative atom in the molecule. In this case the least electronegative atom in the molecule is carbon.
The bond between carbon and oxygen in CO2 is intermittent between a pure double and a pure triple bond. Hence, carbon is sp hybridized.
How many grams of Mn are there in 5.09 moles of Mn?
grams
Explanation:
n=m/M
m=n*M
m=5,09 mol * 54,9g/mol
m= 279,4g
[tex]\text{mass of Mn = 5.09 mol Mn} × \frac{\text{54.94 g Mn}}{\text{1 mol Mn}}[/tex]
[tex]\boxed{\text{mass of Mn = 279.6 g}}[/tex]
The question is in the photo
Answer:
B
Explanation:
from the diagram.... the population of africa increases so..... ofcourse it exceeds its death rate ....
that's all .... have fun
Americium-241 undergoes radioactive decay to produce neptunium-237. Which particle needs to be added to this equation to show that the total numbers of neutrons and protons are not changed by the reaction?
Answer:
alpha particle needs to be added to the equation.
Explanation:
Given;
atomic mass of Americium = 241
atomic mass of neptunium = 237
The difference in atomic mass of the radioactive elements given is calculated as;
241 - 237 = 4
The particle with atomic mass of 4 is alpha particle usually represented with helium atom.
Am²⁴¹ -----> He⁴ + Np²³⁷
Thus, alpha particle needs to be added to the equation.
Answer:
4/2 HE
Explanation:
a p e x!
What is 0.738 × 104? Enter your answer in the box.
_____