Answer:
Percentage of Ba = 52.5%
Explanation:
We'll begin by calculating the molar mass of Ba(NO3)₂. This can be obtained as follow:
Molar mass of Ba(NO3)₂ = 137 + 2[14 +(16×3)]
= 137 + 2[14 + 48]
= 137 + 2[62]
= 137 + 124
= 261 g/mol
Next, we shall determine the mass of Ba in Ba(NO3)₂. This can be obtained as follow:
Mass of Ba in Ba(NO3)₂ = 137 g/mol
Finally, we shall determine the percentage of Ba in Ba(NO3)₂. This can be obtained as follow:
Percentage of Ba = mass of Ba / mass of Ba(NO3)₂ × 100
Percentage of Ba = 137 / 261 × 100
Percentage of Ba = 13700 / 261
Percentage of Ba = 52.5%
Thus, the percentage of Ba in Ba(NO3)₂ is 52.5%
For the reaction Cu2S(s)⇌2Cu+(aq)+S2−(aq)Cu2S(s)⇌2Cu+(aq)+S2−(aq), the equilibrium concentrations are as follows: [Cu+]=1.0×10−5[Cu+]=1.0×10−5 M, [S2−]=1.0×10−2[S2−]=1.0×10−2 M. The equilibrium constant is:
Answer:
1x10⁻¹²
Explanation:
Cu₂S(s) ⇌ 2Cu⁺(aq) + S²⁻(aq)At equilibrium:
[Cu⁺] = 1.0x10⁻⁵ M[S²⁻] = 1.0x10⁻² MThe equilibrium constant for the the reaction can be written as:
Keq = [Cu⁺]² * [S²⁻][Cu⁺] is squared because it has a stoichiometric coefficient of 2 in the reaction. Cu₂S has no effect on the constant because it is a solid.
Now we can calculate the equilibrium constant:
Keq = (1.0x10⁻⁵)² * 1.0x10⁻² = 1x10⁻¹²What is the thermal efficiency of an engine that takes n moles of diatomic ideal gas through the cycle
Answer:
The thermal efficiency of an engine is [tex]0.15[/tex] that is 15%
Explanation:
Specific heat of a gas at constant volume is
[tex]C_{v}=\frac{fR}{2}[/tex]
here, [tex]f=[/tex]degree of freedom
[tex]R=[/tex]universal gas constant
Thermal efficiency of a cycle is
[tex]\frac{total workdone}{gross heat absorbed}[/tex]
Gross heat absorbed is amount of heat that absorbed.
ω[tex]=P_{o} V_{o}[/tex]
[tex]Q_{AB}=[/tex]Δ[tex]V_{AB}+[/tex]ω[tex]_{AB}[/tex][tex]=nC_{v}(T_{f}-T_{i} )[/tex]
[tex]=n\frac{f}{2}(RT_{f}-RT_{i} )[/tex][tex]=\frac{f}{2}(P_{o}V_{o} )[/tex]
[tex]Q_{BC}=n(\frac{f}{2}+1 )R(T_{f}-T_{i} )[/tex]
[tex]=(\frac{f}{2} +1)(4P_{o}V_{o}-2P_{o}V_{o} )[/tex]=[tex]=(\frac{f}{2}+1)2P_{o}V_{o}[/tex]
[tex]Q_{CD}=-ve and Q_{DA}=-ve[/tex] these 2 are not the part of gross heat
η[tex]=\frac{P_{o}V_{o} }{(\frac{3f}{2}+2 )(P_{o}V_{o})}[/tex]
[tex]=\frac{1}{(\frac{3f}{2}+2 )}[/tex]
For monoatomic gas [tex]f=3[/tex]
η[tex]=\frac{2}{13}[/tex]
[tex]=0.15[/tex]
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST ANY ANSWERS WOULD BE GREATLY APPRECIATED :) chemical reaction will stop when the limiting reactant is used up.Question 1 options:
True
False
I believe that this statement is true
How many moles of NH3 are produced when 0.45 moles of H2 gas react
with N2 gas? N2 + 3H2 -->2 NH3 (mole to mole conversion)
Answer:
[tex]\boxed {\boxed {\sf 0.3 \ mol \ NH_3}}[/tex]
Explanation:
We need to use stiochiometry and a mole to mole conversion to solve this problem.
First, examine the chemical equation. Make sure it is balanced before doing any calculations.
[tex]N_2+3H_2 \rightarrow 2NH_3[/tex]
It is balanced, so we can also use the coefficients to refer to molar amounts.
So, the equation is also saying that 1 mole of N₂ (no coefficient implies 1) and 3 moles of H₂ react to form 2 moles of NH₃.
[tex]1 \ mol \ N_2 + 3 \ mol \ H_2 \rightarrow 2 \ mol \ NH_3[/tex]
Now we can use this information to make a ratio. We know that we have 0.45 moles of hydrogen, and we are trying to find the moles of ammonia.
According to the original equation, 3 moles of hydrogen produce 2 moles of ammonia. Let's make a ratio.
[tex]\frac {3 \ mol \ H_2}{2 \ mol \ NH_3}[/tex]
We have 0.45 moles of hydrogen, so multiply by that number.
[tex]0.45 \ mol \ H_2 *\frac {3 \ mol \ H_2}{2 \ mol \ NH_3}[/tex]
Flip the ratio so the units of moles of hydrogen cancel.
[tex]0.45 \ mol \ H_2 *\frac{2 \ mol \ NH_3 }{3 \ mol \ H_2}[/tex]
[tex]0.45 *\frac{2 \ mol \ NH_3 }{3}[/tex]
[tex]\frac {0.45 *2 \ }{3} mol \ NH_3[/tex]
[tex]\frac {0.9 \ }{3} mol \ NH_3[/tex]
[tex]0.3 \ mol \ NH_3[/tex]
0.3 moles of ammonia are produced when 0.45 moles of hydrogen gas react with nitrogen gas.
Fill the missing blank
i’m generally confused about this so if anyone could help me it would mean a lot!!!!
Answer:
The answers to your questions are given below.
Explanation:
1. The symbol of Zinc is Zn
2. Determination of the proton number
Atomic number is simply defined as the number of protons in the nucleus of an atom. Mathematically, it is expressed:
Atomic number = proton number
Atomic number = 30
Therefore,
Proton number = 30
3. Determination of the neutron number
Mass Number = 65
Proton number = 30
Neutron number =?
Mass number = Proton + Neutron
65 = 30 + Neutron
Collect like terms
65 – 30 = Neutron
35 = Neutron
Thus,
Neutron number = 35
4. Determination of the electron number
Since the element is in it's ground state (i.e it has no charge), thus, the number of protons of the element is the same as number of electrons i.e
Electron number = proton number
Proton number = 30
Thus,
Electron number = 30
True or false: A skeleton equation in chemistry shows the relative amounts of all materials in the reaction
Answer:
false im pretty sure.
What is the major organic product obtained from the reaction of (R)-2-bromohexane with sodium cyanide/acetone
Answer:
Option C
Explanation:
The complete question is
What is the major organic product obtained from the reaction of
(R)-2-bromohexane with sodium cyanide/acetone?
A) ) trans-2-pentene
B) ( S)-2-Methylpentanenitrile
C) ( S)-2-Methylhexanenitrile
D) (plus or minus)-2-Methylpentanenitrile
Solution
This is an inversion reaction in which (R) 2 Bromohexane convert into (S) -2 – methyl hexane in the presence of Acetone and NaCN.
The reaction occurs through the SN2 mechanism and there is inversion of confiruration
Hence, option C is correct
A voltaic cell consists of an Mn/Mn2 half-cell and a Pb/Pb2 half-cell. Calculate [Pb2 ] when [Mn2 ] is 1.1 M and E cell is 0.44 V.
Answer:
[Pb²⁺] = 2.31x10⁻²¹ M
Explanation:
Let's write the semi reaction for each half cell:
Pb²⁺ + 2e⁻ -----------> Pb(s) E° = -0.13 V
Mn²⁺ + 2e⁻ ----------> Mn(s) E° = -1.18 V
As we can see, the E° of Pb is higher than the E° of the Mn, thus, Pb is reducting and Mn is oxidizing:
Pb²⁺ + 2e⁻ -----------> Pb(s) E°₁ = -0.13 V
Mn(s) ---------> Mn²⁺ + 2e⁻ E°₂ = +1.18 V
E° = E°₁ + E°₂
E° = -0.13 + 1.18 = 1.05 V
Now, we can use the Nerst equation which is:
E = E° - 0.059/n log([Mn²⁺] / [[Pb²⁺])
From here, we just need to replace and then, solve for the [Pb²⁺]:
0.44 = 1.05 - 0.059/2 log(1.1 / x)
0.44 - 1.05 = -0.0295 log(1.1 / x)
-0.61 / -0.0295 = log(1.1 / x)
antlog(20.678) = 1.1 /x
x = [Pb²⁺] = 1.1 / 4.76x10²⁰
[Pb²⁺] = 2.31x10⁻²¹ MHope this helps
How is the molar mass of a molecule determined? What are its units?
Answer:
Explanation:
molar mass=valency of the element*atomic number
its unit is amu
Help.
Work needs to be shown
show equations and how you did it
Answer:
436.8 mmHg.
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 0.93 atm
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Next, we shall convert the total pressure to mmHg . This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
0.93 atm = 0.93 × 760 mmHg / 1 atm
0.93 atm = 706.8 mmHg
Finally, we shall determine the pressure of the O₂. This can be obtained as follow:
Total pressure (Pₜ) = 706.8 mmHg
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Pₜ = Pₙ₂ + Pₒ₂
706.8 = 270 + Pₒ₂
Collect like terms
706.8 – 270 = Pₒ₂
436.8 = Pₒ₂
Pₒ₂ = 436.8 mmHg
Thus, the pressure of O₂ is 436.8 mmHg
ik most of it but my brain is not functioning rn
Answer:
A. Infiltration
B. Ground water discharge
C. Water storage in the ocean
D. Evaporation
E. Condensation
F. Precipitation
G. Runoff
im not sure about A-C
hope this helps
have a good day :)
Explanation:
help ! thank u / ill give brainlist !
Give two examples of energy transformations that occur throughout the journey to or on the planet.
Answer:
Our bodies convert chemical energy in our food into mechanical energy for us to move.
An electric fan transforms electrical energy into kinetic energy
Reword it tho
Hope this helps!!
A weather balloon is inflated to a volume of 26.7 L at a pressure of 748 mmHg and a
temperature of 28.4 °C. The balloon rises in the atmosphere to an altitude where the pressure is
400. mmHg and the temperature is -15.6 °C.
Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.
Answer:
42.64 L
Explanation:
Using the combined law equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information in this question,
P1 = 748mmHg
P2 = 400mmHg
V1 = 26.7 L
V2 = ?
T1 = 28.4 °C = 28.4 + 273 = 301.4K
T2 = -15.6 °C = -15.6 + 273 = 257.4K
Using P1V1/T1 = P2V2/T2
748 × 26.7/301.4 = 400 × V2/257.4
66.26= 1.554 V2
V2 = 66.26 ÷ 1.554
V2 = 42.64 L
How many moles are in 482 mL of a 1.91 M solution of NaBr?
Answer:
0.921 moles
Explanation:
1.91 M means 1.91 moles/liter
482 mL = 0.482 L
0.482 L × 1.91 moles/liter = 0.92062 moles
Three solutions are mixed together to form a single solution; in the final solution, there are 0.2 mol Pb(CH3COO)2, 0.1 mol Na2S, and 0.1 mol LiCl present. find preciptate
Three solutions are mixed together to form a single solution. The precipitate in the solution is PbS and PbCl₂.
What are precipitates?Precipitates are the residues that are present in the solution. These residues are solid that came out of the solution.
Here given 3 compounds are water-soluble.
From the solution, we have to find the possible combination which is water-soluble.
Consider,
Pb(CH3COO)₂ Pb₂+(aq) + 2CH₃COO-(aq)
Na₂S₂Na+(aq) + S₂-(aq)
LiCl Li+(aq) + Cl-(aq)
Now consider a potential accumulation of positive and negative ions which is water-soluble.
The possible accumulations are,
PbS , PbCl₂
Ca(CH₃COO)₂ , CaS
Now viewing with solubility charge, we can find that both PbS and PbCl2 are water indissoluble and create a precipitate.
But both Ca(CH₃COO)₂ and CaS are water-soluble.
Therefore, the precipitates are PbS and PbCl₂.
To learn more about precipitates, refer to the link:
https://brainly.com/question/20925010
#SPJ2
why does a plant have a cell wall and a cell membrane?
ASAP Pls have to turn it in at 11:00pm
Answer:
The cell wall surrounds the plasma membrane and provides the cell tensile strength and protection. ... The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress.
hope It Helps U
Please Mark me As brainlist
Which best explains the relationship between evaporation and temperature?
• A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed
as easily from the liquid's surface.
O A liquid evaporates faster at lower temperatures becaus the attractions are decreased and more particles can
escape the surface of the liquid.
© A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, SO fewer
molecules can escape the surface.
• A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome
attractions in the liquid.
Answer: D
Explanation:
liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
Part B
Explain what happened to make the water in the plastic bowl different from the water in the pot.
Answer:
I'd say the plastic particles in the bowl boiled off into the water to make the water cloudy and taste different. While the water boiled in the pot was clearer and tasted no different than regular water
Explanation:
I'm doing the course activity now.
The free energy of ATP hydrolysis is used to maintain the concentration of Ca2 inside the cell to be constant. Calculate the number of moles of ATP required to pump out one mole of Ca2 when the cell is placed in a liquid culture containing 1 M CaCl2 at 25oC. The concentrations of ADP and Pi inside the cell are 250 mM and 10 mM, respectively, and that of ATP is 1.5 mM. The standard free energy of ATP hydrolysis at 25oC is O31.0kJ.
Answer:
The response can be defined as follows:
Explanation:
ATP is a hydrolysis energy-saving money of the cell. It is used to support the cell's endothermic processes.
[tex]ATP\ +\ H_{2}O\ \rightleftharpoons \ ADP\ +\ P_{i}\\\\Q\ = \ \frac{[ADP][P_{i}]}{[ATP][H_{2}O]}\\\\ADP= 0.250 \ M\\\\P_i = 0.010 \ M\\\\ATP = 0.150 \ M\\\\H_2O = 55.55 \ M\\\\\Delta G \ =\ \Delta G^{o}\ +\ 2.303\ RT\ \log\ Q\\\\R = 8.314 \frac{J}{mol\ K}\\\\T = 298\ K\\\\[/tex]
HELP ME ASAP PLEASE
I need the answers I’m in a hurry
Answer: First box----Hail
Second Box-------Snow
Thrid Box-------Sleet
Forth Box-----Rain
Hope that helped! :)
D D 8. (06.02 LC)
A heating curve has two flat lines, or plateaus. What does the plateau at the lower temperature represent? (5 poin
A. Boiling of a liquid
B. Melting of a solid
C. Increase in temperature of a substance
D. Decrease in temperature of a substance
Answer:
Boiling of a liquid
The plateau at the lower temperature represents option A. Boiling of a liquid.
Representation of the plateau at the lower temperature:At the time when the heating curve should have two flat line or the plateaus so here the lower temperature shows the boiling of the liquid.
As the first plateau shows the melting and the second plateau shows the boiling.
hence, the option a is correct.
Learn more about temperature here: https://brainly.com/question/22262659
What would you expect to be the electron-group arrangement around atom A in the following case? Give the ideal bond angles and the direction of any expected deviation.
Answer:
The answer is "Tetrahedral".
Explanation:
The carbon atom of approximately [tex]109.5^{\circ}[/tex] with four attachments. Its general form is one of a tetrahedron: a polyhedron consisting of 4 triangular sides, six straight edges, and four vertex corners from all faces equilateral triangles. The triangular pyramid is often referred to as the triangular pyramid.
Fassst. A or b or c or d plzzz
Answer:
C
Explanation:
Kepler first law means that planets mover around the sun in a elliptical motion
What is the general form for the simplest type of acid-base reaction?
O A. Acid + base > H+ + OH-
B. Acid + base → base + acid
C. Acid + base + salt + water
D. Acid + base → solid + water
Answer:
Your answer is C
Explanation:
When an acid and base react, the acidic hydrogen ion and the basic hydroxide ion in each acid and base neutralize each other and form water. Meanwhile the conjugate base and conjugate acid (the leftover compounds) react to form an ionic molecule, or a salt. (In chemistry, when an anion and a cation form an ionic bond the new molecule is called a salt). Hope this helps!
Calculate the percent composition of Ca3P2
Answer:
Ca - 66%, P - 34%
Explanation:
So, this is the formula we can use to find the amount of each element:
Element count * Atomic mass = Mass
Plug in our elements for this:
Ca - 3*40.078=120.234
P - 2*30.973=61.946
Now, to find the percentage of mass, we must find total mass, and divide the two elements mass count by this total mass:
120.234+61.946=182.18
Now divide each element mass by the total mass:
Ca - 120.234/182.18=0.6599(Round to 0.65)
P - 61.946/182.18=0.34002(Round to 0.34)
Then multiply both numbers by 100 to get the percentage:
Ca - 65%
P - 34%
So these our your two answer!
Hope this helps!
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST PLUS 20 POINTS If CO2 was added to this system what would the outcomes for this reaction be?
CO2 + H2O <-> H2CO3
Question 4 options:
It would shift to the right, favor the forward reaction and the rate of reaction would decrease.
It would shift to the left, favor the forward reaction and the rate of reaction would increase.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
It would shift to the left, favor the reverse reaction and the rate of reaction would decrease.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
(third option)
2.50 g of CO2 gas is confined in a rigid cylinder at a pressure of 4.65 atm. If 0.42 g of gas is released from the cylinder, what is the new pressure?
Answer:
5.59atm
Explanation:
boyles law
P1V1=P2V2
4.65×2.5=P2×(2.5-0.42)
11.625=P2×2.08
P2=5.59atm
What’s a chemical property
Answer:
A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.
Molecular distances are given in picometers, where 1 pm is equivalent to 1 x 10-12 meter.If the distance between carbon atoms in a diamond is 1.54 x 10-8 cm, what is this distance in picometers
Answer:
Distance = 154 pm
Explanation:
Given that,
The distance between carbon atoms in diamond is [tex]1.54\times 10^{-8}\ cm[/tex]
We need to find the distance in pm.
We know that,
[tex]1\ pm=10^{-12}\ m[/tex]
[tex]1.54\times 10^{-8}\ cm=1.54\times 10^{-8}\times 10^{-2}\ m\\\\=1.54\times 10^{-10}\ m[/tex]
Multiplying and dividing by 10⁻².
[tex]d=1.54\times 10^{-10}\times \dfrac{10^{-2}}{10^{-2}}\\\\=154\times 10^{-12}\ m\\\\=154\ pm[/tex]
So, the distance is 154 pm.
Name the functional group in the
following molecule:
HÖCH2CH2CH3
A, ketone
B, aldehyde
C. ester
D, alcohol
Answer:
aldehyde
Explanation: