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
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 .
Cells reproduce using:
sexual reproduction
budding
mitosis
Answer:
It is D. Mitosis
Explanation:
Hope this helped have an amazing day!
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:
Name the following alkane molecule:
CH3CH2CHBrCH3
A. 2-bromobutane
B. 3-bromopropane
C. 3-bromobutane
Answer:
It's the A. 2-bromobutane
Explanation:
Have a good day
The name of the alkane molecule [tex]\rm CH_3CH_2CHBrCH_3[/tex] is 2-bromobutane. The correct answer is option A.
An alkane is a type of hydrocarbon molecule that consists entirely of single-bonded carbon and hydrogen atoms. Alkanes are also known as saturated hydrocarbons.
The name of an alkane molecule is based on the number of carbon atoms in the longest chain of carbon atoms in the molecule. In this molecule, there are four carbon atoms in the longest chain, so the root name is "butane". The position of the bromine atom is indicated by a number, which is the lowest number assigned to a carbon atom that is attached to the bromine atom. In this case, the bromine atom is attached to the second carbon atom in the chain, so the name is "2-bromobutane".Therefore, 2-bromobutane is the name of the alkane molecule [tex]\rm CH_3CH_2CHBrCH_3[/tex]. Option A is the correct answer.
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Which Two process is it Giving brainliest
Answer:
C and D!
Explanation:
Don't listen to the other dude above me.
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
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.
PLEASE HELP!!!!
If 9.30 g of potassium reacts with 2.50 g of O2 to form K2O , what is the limiting reagent and what is the theoretical yield of the reaction?
Hint: write the balanced reaction
K - 39.10 g/mol
O - 15.999 g/mol
ANSWER CHOICES:
A.) O2 is limiting, 11.2 g of K2O formed
B.) K is limiting, 14.7 g of K2O formed
C.) K is limiting, 11.2 g of K2O formed
D.) O2 is limiting, 14.7 g of K2O formed
E.) O2 is limiting, 19.2 g of K2O formed
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.
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.
A compound is a substance made up of 2 or more _____.
A compound is a substance made up of 2 or more elements
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
Which Two process is it Giving brainliest 100 points
Answer:
Boiling and evaporating
Explanation:
Its loosing water just trust
24. The hydronium ion concentration in a sample of rainwater is found to be 1.7 × 10−6 M at 25 °C. What is the concentration of hydroxide ions in the rainwater?
Answer:
6144
Explanation:
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 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
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:
What is the final concentration of a solution prepared by adding water to 50.0 mL of 1.5 M NaOH to make 1.00 L of solution? a) 0.075 M b) 1.5 m c) 7.5 M d) 30 M e) 0.030 M
Answer:
The final concentration of the solution is 0.075 M (option a)
Explanation:
Dilution consists of reducing the concentration of solute in solution, simply adding more solvent to the solution. In other words, dilution is the procedure for preparing a less concentrated solution from a more concentrated one, and it simply consists of adding more solvent.
In a dilution it is fulfilled:
Vi * Ci = Vf * Cf
where Vi is the initial volume, Ci is the initial concentration, Vf is the final volume and Cf is the final concentration.
In this case:
Vi= 50 mL= 0.05 L(being 1,000 mL= 1 L)Ci= 1.5 MVf= 1 LCf= ?Replacing:
0.05 L* 1.5 M= 1 L* Cf
Solving:
[tex]Cf=\frac{0.05 L*1.5 M}{1 L}[/tex]
Cf= 0.075 M
The final concentration of the solution is 0.075 M (option a)
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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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.
Here’s another one guys please help.
Answer:
Explanation:
i think B im not sure
elements are made up of atoms, and atoms are made up of electrons, protons, and neutrons. Match the charge (+,-,0= positive, negative, neutral) with the electron, proton, and neutron
for example, you might write: electron=+ (I'm not saying this is the correct pairing)
Answer:
Explanation:
Electron (-) Negative
Proton (+) positive
Neutron(0) neutral
Is F2 and atom or a molecule and is it a pure element or a
compound?
a. Atom, Compound
b. Molecule: Compound
c. Molecule, Pure element
Answer:
Answer : C Molecule, Pure Element
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.
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1. A cyclist accelerates from 7 m/s to 11 m/s in two seconds. What is his acceleration?
m/s/s
Answer:
[tex]\boxed {\boxed {\sf 2 \ m/s^2}}[/tex]
Explanation:
Acceleration can be found by dividing the change in velocity by the time.
[tex]a=\frac{v_f-v_i}{t}[/tex]
The final velocity is 11 meters per second and the initial velocity is 7 meters per second. The time is 2 seconds.
[tex]v_f=11 \ m/s\\v_i=7 \ m/s\\t= 2 \ s[/tex]
Substitute the values into the formula.
[tex]a=\frac{11 \ m/s-7 \ m/s}{2 \ s}[/tex]
Solve the numerator.
11 m/s - 7 m/s = 4 m/s[tex]a=\frac{4 \ m/s}{2 \ s}[/tex]
Divide.
[tex]a= 2 \ m/s/s[/tex] or [tex]a= 2 \ m/s^2[/tex]
The acceleration of the cyclist is 2 meters per second squared.
what is the molar mass of potassium
permanganate in amu?
Answer:
158.033944 g/mol
Explanation:
2. Why can a liquid take the shape of the bottom of its container?
The particles of a liquid can flow around one another to new locations.
The particles of a liquid can break free from one another and spread out.
The particles of a liquid can vibrate within their fixed locations.
Answer:
The particles can flow around one another to new locations.
Explanation:
The atoms in a liquid can take the form of their container, the atoms in a liquid are loosely packed.
Answer:
i believe it is the second one
Explanation:
solid particles vibrate and gas is more free the liquid is confide but free at the same time.
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.
Which of the following is not a reason why chemical bonds are important
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
electrons that are free to move throughout a substance are associated with
Answer:
valence electrons
Explanation: