Answer:
65.38 u
Explanation:
hope this helps you out!!!!!!!
They Mean D and not U H just took the test and its D i hope this help
Calculate the freezing point of a solution made by dissolving 13 g potassium sulfide in 150 g H2O Kf for water = 1.86 C/m
Answer:
[tex]T_F=-4.4\°C[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to calculate the freezing point of an aqueous solution of potassium sulfide by using the following equation:
[tex]T_F=T_{solv}-i*m*Kf[/tex]
In such a way, we firstly calculate the molality of this solution according to:
[tex]m=\frac{\frac{13g}{110.262 g/mol} }{0.150kg} =0.79m[/tex]
Finally, since the Van't Hoff's factor for K2S is 3, the freezing point of the solution turns out to be:
[tex]T_F=0\°C-3*0.79m*1.86\°C/m\\\\T_F=-4.4\°C[/tex]
Regards!
Iron ore exists as Fe2O3. In order to remove the oxygen and generate pure iron, the oxygen must be transferred to another molecule. Carbon monoxide can be mixed with iron ore and carbon dioxide is generated. Carbon monoxide is produced in the combustion of carbon with limited oxygen. Calculate the value of ΔS° for the oxidation of carbon to carbon monoxide,
2C (s, graphite) + O2 (g) --> 2CO (g)
A. +179.4 J/mol K
B. +408.6 J/mol K
C. -408.6 J/mol K
D. +395.8 J/mol K
If a balloon expands to occupy a volume of 5.25 Liters going from 15 atm to 25 atm, what was the initial volume?
03.15L
O 7.75L
Answer:
V₁ = 8.75L
Explanation:
P₁ × V₁ = P₂ × V₂
15atm × V₁ = 25atm × 5.25L
V₁ = 8.75L
PLEASE HELP, DUE AT 12:00
Answer:
5.C6.DExplanation:
YONG ISA PO ETO HINDI KO PO ALAM TOH
PLZ HELP ON TIMER WILL GIVE BRAINLIEST
How does technology limit the future of space exploration?
There are too many devices in space interfering with taking correct measurements.
Scientists cannot make contact with older satellites in outer space.
Scientists are able to work both with current and future technology.
Scientists must first develop certain technologies before missions can be completed.
Answer:
I would put the final answer choice: "Scientists must first develop certain technologies before missions can be completed"
Explanation:
The first option is partially true, but we have ways around it.
The second option is straight-up false.
The third option doesn't make much sense, how can one work with technology that will be developed in the future and doesn't yet exist?
Therefore, the fourth option is the best.
Hope this helps
-cyber
What is the pH of a solution with a concentration of 7.6 × 10–7 M H3O+?
0.993
6.12
7.88
8.34
Answer:
Ph = 6.12....
here ya go
Explanation:
-
The pH of the solution with a concentration of 7.6 × [tex]10^{-7}M[/tex] [tex]H_{3}O^{+}[/tex]will be 6.12.
What is pH?The pH of water indicates how acidic or basic it is. The scale runs from 0 to 14, with 7 representing neutrality. Acidity is indicated by a pH less than 7, while a pH greater than 7 denotes a base. The relative number of free hydrogen, as well as hydroxyl ions in water, and hydroxyl ions in water is measured by pH .
It is known that ,[[tex]H_{3}O^{+}[/tex]]=[tex][H^{+} ][/tex]
pH can be calculated by the formula:
[tex]pH = -logH^{+}.[/tex]
Now, put the value of hydrogen ion in above equation
pH = -log[7.6×10^{-7}M]
= -log(7.6)-log(10^{-7}
= -0.88+7log 10
= -0.88 +7
= 6.12.
Therefore, the pH of the solution will be 6.12.
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how to make 100 ml of 0.001 mM solution with 0.0405mM solution?
Answer:
Measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water
Explanation:
To make 100 mL of 0.001 mM solution from 0.0405mM solution, we need to determine the volume of 0.0405mM solution needed. This can be obtained as follow:
Molarity of stock (M₁) = 0.0405 mM
Volume of diluted (V₂) = 100 mL
Molarity of diluted solution (M₂) = 0.001 mM
Volume of stock solution needed (V₁) =?
M₁V₁ = M₂V₂
0.0405 × V₁ = 0.001 × 100
0.0405 × V₁ = 0.1
Divide both side by 0.0405
V₁ = 0.1 / 0.0405
V₁ = 2.47 mL
Therefore, to make 100 mL of 0.001 mM solution from 0.0405mM solution, measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water.
choose me physics subject
which property of metal is used for making utensils??
Answer:
Metals are good conductors of heat. Due to this property metals are used in the preparation of kitchen utensils. Aluminium is good conductor of heat and more over it is corrosion resistent. Due to these properties aluminium is used in making kitchen utensils.
Explanation:
8. What is the mass of 4.50 x 1022 Cu atoms?
Answer:
4.7485 g
Explanation:
4.50 x 10^22 Cu atoms * (1 mol Cu / 6.022 x 10^23 Cu atoms) * 63.546 g Cu/(mol Cu) = 4.7485 g
In every mole of Cu, there are 6.022 x 10^23 atoms (Avogadro's number). The molecular weight of copper is 63.546 g/mol.
Helpppooo give answer thanks
Answer:
625 mL
Explanation:
From the question given above, the following data were obtained:
Volume of stock solution (V₁) = 250 mL
Molarity of stock solution (M₁) = 5 M
Molarity of diluted solution (M₂) = 2 M
Volume of diluted solution (V₂) =?
The volume of the diluted solution can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
5 × 250 = 2 × V₂
1250 = 2 × V₂
Divide both side by 2
V₂ = 1250 / 2
V₂ = 625 mL
Therefore, the volume of the diluted solution is 625 mL.
What is the Molar mass of zinc
Answer:
the molar mass of zinc is 65.38u or 65.38 grams(g).
What is a natural resource?
Answer:
materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain.
Explanation:
All of the following are examples of human organs EXCEPT the
1.heart
2.eyelashes.
3.skin
4. brain
It for science
Answer:
eyelashes are not a part of the the human organs
Why are fossil fuels considered nonrenewable resources?
Answer:
They are considered nonrenewable because they are prehistoric animals that has been extinct therefore can't be renew.
The lattice-like structure of a metal consists of negative metal ions in a "sea" of electrons.
O True
O False
Answer:
True
Explanation:
If a balloon has a volume of 1.696 L at a pressure of 2.11 0 atmospheres, what will be the volume of the balloon if the pressure is increased to 5.067 atmospheres?
Answer:
I think that the volume will be 1.414
Explanation:
According to the formula of boyle's law P1 V1 = P2 V2
We have to find V2 so:
V2 = P2/P1 V1
By putting the values:
V2 = 5.06/2.11 * 1.696
V2 = 5.06/3.578
V2 = 1.414
Please give me brainliest, it will mean a lot to me.
Which of the following statements explains how concentration of a solution affects the rate of a reaction? (5 points)
O a
When concentration decreases, kinetic energy increases.
Ob
When concentration increases, particles collide less often.
When concentration increases, particles collide more often.
Oc
Od
When concentration decreases, collision of particles increases.
Answer:
when concentration increases, particles colide more often
The statement "When concentration increases, particles collide more often" is correct.
What is concentration?A constituent's abundance divided by the entire volume of a combination is known as concentration. Mass concentration, molar concentration, number concentration, and volume concentration are all examples of mathematical descriptions.
There are much more reactant particles travelling together as the concentration of reacting species increases. Because there would be more collisions, the reaction rate will be faster. The rate of a reaction increases as the concentration of reactants increases.
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How many valance electrons does He need to get to 8
Answer:
Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons
Describe the differences between a geocentric model and heliocentric model. What model is the current Sun-Earth-Moon System based on?
Answer:
Geocentric is a description that says all objects, including the moon, sun and stars orbit around the Earth.
Heliocentric is a description that says all objects including the moon, Earth and stars revolve around the sun.
Most textbooks would tell you that the current system is heliocentric.
Help me find out which reaction is balanced
Answer:The answer is c
Explanation:
Which statement best describes what occurs during a chemical reaction?
Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change
Answer:
The bonds in reactants break so that elements can rearrange form new products
Explanation:
Draw the major organic product(s) of the reaction of p-bromoaniline with HNO2, HCl.
Answer:
The major product from this reaction is 4-bromobenzene diazonium chloride.
Explanation:
The reaction of p-bromoaniline with HNO2 and HCl produces diazonium salt. When primary aromatic amines are nitrosated with nitrous acid in the presence of a strong acid such as HCl, diazonium salts are frequently formed. The diazonium salts are a crucial step in the production of halides and azo compounds. The necessary reaction mechanism is depicted in the illustration in the diagram below.
Hi, can someone plz help me with how to answer this: The conservation of energy?
Thank You :)
In osmosis: a. Knowing the osmotic pressure can help determine the molar mass of a solute dissolved in a solvent. b. The semipermeable membrane is used to change the freezing and melting points of a solution. c. Solutions cannot have identical osmotic pressures. d. Temperature does not affect the osmotic pressure of a solution. e. At least two of the above statements are correct.
Answer:
a)
Explanation:
Osmosis is a process in which there is movement of solvent molecules through a semipermeable membrane to wards the higher concentration of solute or lower concentration of solvent from a lower concentration of solute molecule. Osmosis can occur in different liquids and even in gases.
Also, in osmosis knowing the osmotic pressure can help determine the molar mass of a solute dissolved in a solvent.
The main biochemical components of living things are ___
Answer:
Amines ketones aldehydes and aromatic
Explanation:
my opinion but thats my answer
write one other example (other than the one in your note) of ore of the following metals
a) Aluminium
b) Lead
c) Iron
Define, triple covalent bond
Answer:
it's a covalent linkage in which two atoms share three pairs of electrons as in nitrogen molecule or acetylene
Determine la temperatura Kelvin de 2.49 moles de gas contenido en un
recipiente de 1.0 L a una presión de 143 kPa. *
what is the most well known supercontinent?
Answer:
Pangaea
FILLER FILLER FILLER