Answer: C.) K is limiting, 11.2 g of [tex]K_2O[/tex] formed
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Putting in the values we get:
[tex]\text{Number of moles of potassium}=\frac{9.30g}{39.10g/mol}=0.238moles[/tex]
[tex]\text{Number of moles of oxygen}=\frac{2.50g}{31.99g/mol}=0.0781moles[/tex]
[tex]4K+O_2\rightarrow 2K_2O[/tex]
According to stoichiometry :
4 moles of [tex]K[/tex] require 1 mole of [tex]O_2[/tex]
Thus 0.238 moles of [tex]K[/tex] will require=[tex]\frac{1}{4}\times 0.238=0.0595moles[/tex] of [tex]O_2[/tex]
Thus [tex]K[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
As 4 moles of [tex]K[/tex] give = 2 moles of [tex]K_2O[/tex]
Thus 0.238 moles of [tex]K[/tex] will give =[tex]\frac{2}{4}\times 0.238=0.119moles[/tex] of [tex]AgCl[/tex]
Mass of [tex]K_2O=moles\times {\text {Molar mass}}=0.119moles\times 94.2g/mol=11.2g[/tex]
Thus K is limiting and 11.2 g of [tex]K_2O[/tex] will be formed.
In a mixture of He, O, and N, gases He exerts a partial pressure of 15.22 mm Hg and
the partial pressure of O, is 35.21 mm Hg. What is the partial pressure of N, if the total
pressure is 88.91 mm Hg.
Answer:
P(N) = 38.48 mmHg
Explanation:
Given data:
Partial pressure of He = 15.22 mmHg
Partial pressure of O = 35.21 mmHg
Partial pressure of N = ?
Total pressure = 88.91 mmHg
Solution:
According to Dalton law of partial pressure,
The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.
Mathematical expression:
P(total) = P₁ + P₂ + P₃+ ............+Pₙ
Now we will solve this problem by using this law.
P(total) = P(He) + P(O) + P(N)
88.91 mmHg = 15.22 mmHg + 35.21 mmHg + P(N)
88.91 mmHg = 50.43 mmHg + P(N)
P(N) = 88.91 mmHg - 50.43 mmHg
P(N) = 38.48 mmHg
If the abundance of 85 Rb is 72.2% and the abundance of 87 Rb is 27.8%, what is the average atomic mass of rubidium?
The average atomic mass of Rubidium : 85.556 u
Further explanationIsotopes are atoms that have the same atomic number but different mass numbers
Each isotope has an abundance which is usually expressed as a percentage
The average relative mass of atoms is obtained by adding the product of the percentage and mass of each isotope
Can be formulated:
[tex]\tt Average~Mass~atom~X=mass~isotope~ 1\times \%1+mass~isotope~2\times \%2+..[/tex]
The abundance of 85 Rb is 72.2% and the abundance of 87 Rb is 27.8%, so
mass isotope 1=85, %abundance=72.2
mass isotope 2=87, %abundance=27.8
The averages atomic mass of Rubidium :
[tex]\tt average~atomic~mass=85\times 0.722+87\times 0.278\\\\average~atomic~mass=61.37+24.186\\\\average~atomic~mass=\boxed{\bold{85.556~u}}[/tex]
what is the molar mass of potassium
permanganate in amu?
Answer:
158.033944 g/mol
Explanation:
Assume that only non-metals are involved in the formation of the following compound, containing: containing: - one atom belonging to an element in group 14 and - two atoms belonging to an element in group 1 and - one atom belonging to an element in group 16. What is the molecular shape of this compound according to the VSEPR model? A. linear B. trigonal pyramidal C. square planar D. trigonal planar E. tetrahedral bent
Answer:
Option D.
Explanation:
The correct answer is option D that is Trigonal planar because of the data or following information given from the question;
=> "one atom belonging to an element in group 14".
This means that one atom has a lesser electronegativity. And this atom will be the central atom (reason: central atoms have less electronegativity).
=>" two atoms belonging to an element in group 1"
One of the characteristics of group one is it ability to form only one bond, here we will be considering the number of bonds which is one.
=>" one atom belonging to an element in group 16."
Here, we have two bonds.
Thus ,the molecules has one single bonds for each atoms and one double bonds for the last description. We have 3 atoms bonded at 120° each to the central atom.
It took 2.35 min with a current of 2.12 A to plate out all the silver from 0.250 L of a solution containing Ag . What was the original concentration of Ag in the solution
Answer:
concentration of Ag = 1.34 g / L .
Explanation:
Quantity of charge = 2.35 x 60 x 2.12 = 298.92 coulomb.
equivalent weight of silver = 108 g .
96500 coulomb deposits 108 g of silver
298.92 coulomb will deposit 108 x 298.92 / 96500 g
= .3345 g . of silver .
.250 L contains .3345 g of silver
1 L contains .3345 x 4 = 1.34 g
concentration of Ag = 1.34 g / L .
whats the atomic number of Al
....................................................dont have to answer this. cant answer anymore questions hope everyone has an amazing day
Answer:
13
Explanation:
is the atomic number of AI
true or false The atoms in Container A are hydrogen atoms. Hydrogen is a gas. The atoms placed in containers E, F, G, and H will fill the same volume as the volume of Container A.
Answer:
False
Explanation:
What is the energy of light with a wavelength of 697 nm?
Answer:
Red 697 nm
384thz-468 the
1.59ev-1.94ev
255zj-310zj
Hopefully I answer yre question
Explanation:
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of electromagnetic wave is 2.81×10⁻¹⁹J.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other.
Mathematically the relation between energy wavelength and speed of light is
E=hc/λ
where,
E = energy of electromagnetic wave=?
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave =697 nm=697×10⁻⁹m
Substituting the values
E= (6.67×10⁻³⁴×3×10⁸)÷697×10⁻⁹m
E=2.81×10⁻¹⁹J
Thus the energy of electromagnetic wave is 2.81×10⁻¹⁹J.
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Calculate the mass percent composition of carbon
in
C3H4
Answer: 90%
Explanation:
So we need to find the molar mass of the entire compound, and the mass of carbon times the number of molecules:
Molar mass: 3*12 + 4*1 = 40
Mass of carbon: 12*3 = 36
36/40 * 100 = 9/10 * 100 = 90%
WILL GIVE BRAINLIEST: PLEASEEE HELP
A student has two beakers of water, one at 25°C and one at 63°C. If they are both mixed together into a larger beaker, how will thermal energy transfer between the molecules of the two glasses of water?
a .Thermal energy will move from the water at 63°C to the water at 25°C.
b. Thermal energy will move back and forth between the systems regardless of temperature.
c. Thermal energy will move from the water at 25°C to the water at 63°C.
d. Thermal energy will not move between the systems.
Answer:
a because hot moves to cold
Explanation:
Here’s another one guys please help.
Answer:
Explanation:
i think B im not sure
How long did it take a bike to travel 20 miles in 12.5 mph?
Answer:
2 hours and 4 mins
Which of the following is soluble in water at 25 °C?
Fe(NO3)2
FeCO3
Fe(OH)2
Fes
Fe3(PO4)2
Answer:
Fe(NO3)2
Explanation:
Out of all the options, the compound that can be dissolved in water is Fe(NO₃)₃.
Fe(NO₃)₃ or Iron Nitrate is capable of being dissolved in water at 25°C. This is in line with its properties as a nitrate because most nitrates are soluble in water at room temperature.
Other properties and uses of Nitrates include:
Contain nitrogen and oxygen Useful in checking water quality Useful in fertilizerIn conclusion, Iron Nitrate is soluble in water at the room temperature of 25°C.
Find out more at https://brainly.com/question/16090921.
If you have 54.63g of TiCl4, determine the theoretical yield of TiO2.
480.90g TiO2
480.90g TiO, 2
23.00 g TiO2
23.00 g TiO, 2
30.06g TiO2
30.06g TiO, 2
1.11g TiO2
1.11g TiO, 2
Answer:
its D:)
Explanation:
In the periodic table, similar acting items are found in
A. Vertical columns of groups
B. Horizontal rows of periods
C. Both rows and columns
D. Alphabetical order
Write the balanced chemical equation for the standard enthalpy of formation of P4O10(s). Be sure to include the phases
Answer:
4 P(s, white) + 5 O₂(g) ⇒ P₄O₁₀(s)
Explanation:
The standard enthalpy of formation of P₄O₁₀(s) is the energy required to synthesize 1 mol of P₄O₁₀(s) from the simple substances in their most stable form. The corresponding balanced chemical equation is:
4 P(s, white) + 5 O₂(g) ⇒ P₄O₁₀(s)
P(s, white) is the most stable allotropic form of phosphorus. The standard enthalpy of formation of P₄O₁₀(s) is -2984 kJ/mol.
The diagram shows different forms of thermal energy transfer.
Which process is making the pot's handle hot?
Answer:
Conduction
Explanation:
The handle is touching the pot.
And I got it wrong
Explain why an element with a large atomic radius won't have a high electronegativity
Explanation:
The larger the radius of an atom, the lesser the electronegativity of the atom. This is because of the screening effect.
Electronegativity of an element is a property that combines the ability of its atom to lose or gain electron. It is mostly expressed as the measure of the relative tendency with which the atoms of the element attract valence electrons in a chemical bond. The larger an atom, the lesser the nuclear charge on the outermost electrons. This weak shielding of these outer shell electrons results in them easily being lost.How could you draw a model of the element copper to show that it is different from the element gold?
please help me hope you understand helllllllpppppppppppppppppp meeeeeeeeee
use the periodic table the atomic number of copper is 29 so neutral copper atoms have 29 protons and 29 electrons to estimate the number of neutrons in the atom round the atomic mass to 64 and subtract the atomic number the atomic number is the number of protons. do the same thing for gold and u have your atomic models for each.
What color do acids turn litmus paper?
pink
red
yellow
blue
Answer:
Blue- I took the test
Explanation:
How long it take for skin cell to divide
Answer:
This process of growing, moving and shedding takes about four weeks. SO I would think dividing is around a month
Explanation:
Hope this helps! Consider Brainiest! <3
Answer:
1/2 to 1 and 1/2 hours
Explanation:
Skin cells go through the division phase that takes between 1/2 to 1 and 1/2 hours to complete, depending on the location. Body cells, which include skin, hair, and muscle, are duplicated through the process of mitosis. Skin cells belong in the category of somatic cells and are duplicated at a rapid rate during life.
A sample of He at 25C and 755 torr occupies a fixed volume of 16.8L. What mass of He must be pumped in to increase the pressure to 1.87 atm if the temperature remains the same?
Answer:
2.4 g
Explanation:
Step 1: Given data
Initial pressure (P₁): 755 torrVolume (V): 16.8 LTemperature (T): 25 °CFinal pressure (P₂): 1.87 atmStep 2: Convert "P₁" to atm
We will use the conversion factor 1 atm = 760 torr.
755 torr × 1 atm/760 torr = 0.993 atm
Step 3: Convert "T" to K
We will use the following expression.
K = °C + 273.15
K = 25°C + 273.15 = 298 K
Step 4: Calculate the initial number of moles of He
We will use the ideal gas equation.
P₁ × V = n₁ × R × T
n₁ = P₁ × V/R × T
n₁ = 0.993 atm × 16.8 L/(0.0821 atm.L/mol.K) × 298 K
n₁ = 0.682 mol
Step 5: Calculate the final number of moles of He
We will use the ideal gas equation.
P₂ × V = n₂ × R × T
n₂ = P₂ × V/R × T
n₂ = 1.87 atm × 16.8 L/(0.0821 atm.L/mol.K) × 298 K
n₂ = 1.28 mol
Step 6: Calculate the moles of He added
n = n₂ - n₁
n = 1.28 mol - 0.682 mol
n = 0.60 mol
Step 7: Convert "n" to mass
The molar mass of He is 4.00 g/mol
0.60 mol × 4.00 g/mol = 2.4 g
Which of the following is not a reason why chemical bonds are important
A compound is a substance made up of 2 or more _____.
A compound is a substance made up of 2 or more elements
True or False:
Carbon forms an incredible variety of substances
because it has eight valence electrons making it a
very stable atom that readily bonds.
Answer:
true i think but dont take my word for it.✌
According to the electronic configuration, carbon has 4 valence electrons that makes it a very stable atom that readily bonds.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Please help! sacrificing my points for this...
which process directly results of this picture?
A.Water erosion
B. Water deposition
C. Wind erosion
D.Wind Deposition.
Answer:
I think it's B
Explanation:
Well I'm pretty sure it's not C or D. And A is detachment or removal of soil by water, And the picture doesn't look like that. So the only explanation is B
Answer:
I go for B.
Explanation:
I
4. Sonic the Hedgehog weighs 3 kg and accelerates at a rate of 300 m/s2.
What is the force that Sonic will apply when he runs into a wall?
Answer:
how the heck did you think of a question like this
Explanation:
In a titration of 35.00 mL of 0.737 M H2SO4, __________ mL of a 0.827 M KOH solution is required for neutralization.
A) 35.0
B) 1.12
C) 25.8
D) 62.4
E) 39.3
Answer:
In a titration of 35.00 mL of 0.737 M H₂SO₄, 62.4 mL of a 0.827 M KOH solution is required for neutralization.
Explanation:
The balanced reaction is
H₂SO₄ + 2 KOH ⇒ 2 H₂O + K₂SO₄
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) 1 mole of H₂SO₄ is neutralized with 2 moles of KOH.
The molarity M being the number of moles of solute that are dissolved in a given volume, expressed as:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
in units of [tex]\frac{moles}{liter}[/tex]
then the number of moles can be calculated as:
number of moles= molarity* volume
You have acid H₂SO₄
35.00 mL= 0.035 L (being 1,000 mL= 1 L) Molarity= 0.737 MThen:
number of moles= 0.737 M* 0.035 L
number of moles= 0.0258
So you must neutralize 0.0258 moles of H₂SO₄. Now you can apply the following rule of three: if by stoichiometry 1 mole of H₂SO₄ are neutralized with 2 moles of KOH, 0.0258 moles of H₂SO₄ are neutralized with how many moles of KOH?
[tex]moles of KOH=\frac{0.0258moles of H_{2} SO_{4}*2 moles of KOH }{1mole of H_{2} SO_{4}}[/tex]
moles of KOH= 0.0516
Then 0.0516 moles of KOH are needed. So you know:
Molarity= 0.827 Mnumber of moles= 0.0516volume=?Replacing in the definition of molarity:
[tex]0.827 M=\frac{0.0516 moles}{volume}[/tex]
Solving:
[tex]volume=\frac{0.0516 moles}{0.827 M}[/tex]
volume=0.0624 L= 62.4 mL
In a titration of 35.00 mL of 0.737 M H₂SO₄, 62.4 mL of a 0.827 M KOH solution is required for neutralization.
0.415 g of an unknown triprotic acid are used to make a 100.00 mL solution. Then 25.00 mL of this solution is transferred to an Erlenmeyer flask and is titrated with 0.1029 M NaOH. The initial burette reading is 1.81 mL; when the titration endpoint is reached, the final burette reading is 39.70 mL. How many moles of triprotic acid are neutralized during the titration? Provide your answer in decimal form (e.g. 0.123) to the correct number of significant figures.
Answer:
Explanation:
Initial burette reading = 1.81 mL
final burette reading = 39.7 mL
volume of NaOH used = 39.7 - 1.81 = 37.89 mL .
37.89 mL of .1029 M NaOH is used to neutralise triprotic acid
No of moles contained by 37.89 mL of .1029 M NaOH
= .03789 x .1029 moles
= 3.89 x 10⁻³ moles
Since acid is triprotic , its equivalent weight = molecular weight / 3
No of moles of triprotic acid = 3.89 x 10⁻³ / 3
= 1.30 x 10⁻³ moles .
How many atoms are in 89.96 moles of carbon
Answer:
541.74× 10²³ atoms of C
Explanation:
Given data:
Number of moles of carbon = 89.96 mol
Number of atoms = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
89.96 mol × 6.022 × 10²³ atoms of C / 1mol
541.74× 10²³ atoms of C