Answer:
6.022×10²³ atoms of K
Explanation:
Given data:
Mass of KClO₃ = 122.5 g
Number of atoms of K = ?
Solution:
First of all we will calculate the number of moles of KClO₃ .
Number of moles = mass/molar mass
Number of moles = 122.5 g/ 122.5 g/mol
Number of moles = 1 mol
One mole of KClO₃ have 1 mole of K atoms.
Number of atoms of K:
1 mole = 6.022×10²³ atoms of K
Thus in 122.5 g of KClO₃ 6.022×10²³ atoms of K are present.
List the pros and cons of combustion.
Answer:
burny stuff
Explanation:
Answer:
Explanation:
Majority of fuels are comprised of hydrocarbons or compounds that contain carbon and hydrogen atoms. In a perfect setting, oxygen is supposed to convert all the hydrogen to water while the carbon is transformed to carbon dioxide.
Unfortunately, achieving a perfect combustion process is near impossible in reality. Fuels burn when they react with the amount of oxygen in the air. With insufficient air, the combustion doesn’t push through normally and ends up as an incomplete or partial combustion. Instead of just carbon dioxide, water, and nitrogen, an impartial combustion process produces harmful byproducts like partially burned hydrocarbons (VOCs) and Nitrogen oxides. A loss in fuel economy also occurs because not all of the fuel is properly processed to produce energy.
A chemistry graduate student is given 250.mL of a 1.60M chlorous acid HClO2 solution. Chlorous acid is a weak acid with =Ka×1.1 x 10^2. What mass of NaClO2 should the student dissolve in the HClO2 solution to turn it into a buffer with pH =1.45?
Answer:
28.04g of NaClO2 must be dissolved
Explanation:
When NaClO2 and HClO2 are mixed in a solution, a buffer is produced. The pH of this buffer is obtained using H-H equation:
pH = pKa + log [NaClO2] / [HClO2]
Where pKa is -log Ka = 1.9586
And [NaClO2] and [HClO2] could be taken as moles of each compound.
Moles of HClO2 are:
250mL = 0.250L * (1.60mol / L) = 0.40 moles HClO2.
Replacing:
pH = pKa + log [NaClO2] / [HClO2]
1.45 = 1.9586 + log [NaClO2] / [0.40mol]
0.31mol = [NaClO2]
To convert these moles to mass we need to use molar mass of NaClO2: 90.44g/mol:
0.31mol * (90.44g / mol) =
28.04g of NaClO2 must be dissolved
Given 700 ml of oxygen at 7 ºC and 80.0 cm Hg pressure, what volume does it take at 27 ºC and 50.0 cm Hg pressure?
Answer:
I think that it might be 2.7
Explanation:
What is the representative particle for boron?
The molecule is the representative particle of molecular compounds. It is also the representative particle of diatomic elements.
I hope this helps you, have a beautiful day ✨
How many moles of carbondioxide are produced when 0.2mol of sodium carbonate react with excess hydrovhloric acid
Answer:
0.2 moles of CO₂ are produced
Explanation:
Given data:
Moles of CO₂ produced = ?
Moles of Na₂CO₃ react = 0.2 mol
Solution:
Chemical equation:
Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O
Now we will compare the moles of CO₂ with Na₂CO₃ .
Na₂CO₃ : CO₂
1 : 1
0.2 : 0.2
Thus, 0.2 moles of CO₂ are produced.
who wants these points
Answer:
GRACIAS
Explanation:
Answer:
Thnx
Explanation:
.
As you move from left to right, the atomic number of each element increases
by
Answer:
Ionization Energy increases from left to right on the periodic table. Atomic radius decreases moving left to right on the periodic table.
Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.
CH4+O2—-CO2+H2O what is the best classification for the unbalanced equations reaction and why
How many moles are in 1.29 x 1024 hydrogen atoms in HF
Answer:
No. Moles = 2.142 mole
Water can be an atom.
True
False
true because I asked my sister
Answer:
false
Explanation:
yep
Of the following, which element has the highest first ionization energy?
Li
Cs
At
F
Networks can be made of bonded ____________________ or ____________________.
hlo good evening everyone
Answer:
hi
Explanation:
Hello good evening' but for me it's a good night
Explanation:
Anyway, thank you for the points have a great day!
When do chemical reactions occur?
Answer:
When the molecular composition changes.
Explanation:
A physical change is a change in size or appearance that can usually be reversed; a chemical change cannot be reversed easily and changes the atomic composition of something.
Calculate the mass percentage of NaClNaCl in a solution containing 1.50 gg of NaClNaCl in 50.0 gg of water.
Answer:
%m/m = 2.9 %
Explanation:
The mass percentage (m/m %) of a solution is calculated as follows:
m/m % = mass of solute/ mass of solution x 100
The solution is composed by : solute + solvent. In this case, the solute is NaCl and the solvent is water. We have:
mass of solute = 1.50 g
mass of solvent = 50.0 g
mass of solution = mass of solute + mass of solvent = 1.50 g = 50.0 g = 51.5 g
Thus, the mass percentage of NaCl in the solution is :
% m/m = (1.50 g)/(51.5 g) x 100 = 2.91 % ≅ 2.9 %
-1
1 point
Which is not a force that causes erosion and deposition?
carbonation
1
glaciers
waves
2
water
3
The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?
a. They are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties.
b. They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
c. They are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties.
d. They are in the same group because they have similar atomic masses, but they are in different periods because they have very different atomic numbers.
Answer:
B: They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
Explanation:
I took the Unit test on EDG and I got it correct
Pls mark me brainliest
What isotope does the model show? ASAP
1. lithium-6
2. lithium-7
3. beryllium-7
4. beryllium-4
Answer:
Lithium 7
Explanation:
An isotope is based off the number of neutrons present 3+4=7
Look on the periodic table to find the element number
The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is ________.
Answer:
7
Explanation:
This question is a neutralization reaction.
50 ml of 0.125 M of KOH = (50 x 0.125) = 6.25 ml
In this same way, 50 ml of 0.125M of HCl = 50x0.125
= 6.25 ml
Then KOH is going to neutralise the HCl fully suvh that the pH of the medium is going to be 7
(H+) + (OH-) = H2O
Then Kw = [H=][OH-]
= [H+]² = 10^-14
Such that [H+] = 10^-7
The pH would be = -log [H+]
= -log[10^-7]
When inputted on a calculator this gives us 7
= 7
This is our answer
what the equipment of diffusion?
Answer:
liquid
a semi permeable membrane
oxygen
Explanation:
plz give me brainiest
compare the size of I, I+ and I-
umm explanation pls so i answee
Calculate the pH at 25 degrees celsius of a 0.39 M solution of pyridinium chloride (c5h5nhcl) . Note that pyridine (c5h5n) is a weak base with a pkb of 8.77 .
Round your answer to 1 decimal place.
Answer:
[tex]pH=2.3[/tex]
Explanation:
Hello!
In this case, since pyridinium chloride has a pKb of 8.77 which is a Kb of 1.70x10⁻⁹ and therefore a Ka of 5.89x10⁻⁵ which means it tends to be acidic, we write its ionization via:
[tex]C_5H_5NHCl(aq)+H_2O(l)\rightleftharpoons C_5H_5NCl^-(aq)+H_3O^+(aq)[/tex]
Because it is a Bronsted base which donates one hydrogen ion to the water to produce hydronium. Thus, we write the equilibrium expression with the aqueous species only:
[tex]Ka=\frac{[C_5H_5NCl^-][H_3O^+]}{[C_5H_5NHCl]}[/tex]
In terms of the reaction extent [tex]x[/tex], we write:
[tex]5.89x10^{-5}=\frac{x*x}{0.39-x}[/tex]
Thus, solving for [tex]x[/tex] we obtain:
[tex]x_1=-0.0048M\\\\x_2=0.0048M[/tex]
Clearly the solution is 0.0048 M because to negative values are not allowed, therefore, since it equals the concentration of hydronium which defines the pH, we write:
[tex]pH=-log([H_3O^+])=-log(0.0048)\\\\pH=2.3[/tex]
Best regards!
What is the pH value of distilled water?
Answer:
7
Explanation:
When a solution of ammonium sulfate is added to a
solution of lead(II) nitrate, Pb(NO3)2, a white
precipitate, lead(II) sulfate, forms. Write a balanced
net ionic equation for this reaction. Both ammonium
sulfate and lead(II) nitrate, Pb(NO3)2 exist as
dissociated ions in aqueous solution.
Answer:
Explanation:
(NH4)2SO4+Pb(NO3)2...............PbSO4+2NH4NO3
The balanced net ionic equation for the reaction between ammonium sulfate (NH₄)2SO₄ and lead(II) nitrate Pb(NO₃)₂, resulting in the formation of lead(II) sulfate (PbSO₄), can be written as follows:
[tex]2NH_{4+} + SO_{4}^2- + Pb^{2+} + NO_{3-} + PbSO_{4} (s) + 2NH_{4+} + 2NO_{3-}[/tex]
In this equation, the ammonium cation (NH₄₊) and nitrate anion (NO₃₋) are spectator ions, meaning they appear on both sides of the equation and do not participate in the actual chemical reaction. Therefore, they are not included in the net ionic equation.
The net ionic equation represents only the species that undergo a change, which in this case is the sulfate anion (SO₄²⁻) and the lead(II) cation (Pb²⁺), leading to the formation of the white precipitate, lead(II) sulfate (PbSO₄).
Therefore, the balanced net ionic equation can be wriiten as:
[tex]2NH_{4+} + SO_{4}^2- + Pb^{2+} + NO_{3-} + PbSO_{4} (s) + 2NH_{4+} + 2NO_{3-}[/tex]
For more details regarding net ionic equation, visit:
https://brainly.com/question/13887096
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How many grams are in 1.50 moles of KMnO4?
A. 165.06
B. 660.24
C. 178.41
D. 237.06
E. 484.29
Explanation:
mole=mass/Molar mass
mass= mole×molar mass
m= 1.5 × (39+55+64)
m= 1.5 × 158
m= 237g
There are 237.06 grams in 1.50 moles of KMnO4.
HOW TO CALCULATE MASS:
The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass. That is;mass of KMnO4 = no. of moles × molar mass of KMnO4Molar mass of KMnO4 = 39 + 55 + 16(4)= 158g/mol
mass of KMnO4 = 158g/mol × 1.5molMass of KMnO4 = 237gTherefore, there are 237.06 grams in 1.50 moles of KMnO4.Learn more at: https://brainly.com/question/15743584?referrer=searchResults
Which statement describes a way electromagnetic waves are different from
mechanical waves?
A. Electromagnetic waves can travel only through matter.
B. Electromagnetic waves can carry energy over a distance,
0 0
C. Electromagnetic waves can transfer matter through empty space.
D. Electromagnetic waves can travel through empty space,
Answer:
D. Electromagnetic waves can travel through empty space.
Explanation:
Answer:
its drum roll please D.) Electromagnetic waves can travel through empty space
Explanation:
please wash your hands and stay safe 2021
trioxocarbonate iv acid
Answer:
Trioxocarbonate (iv) are salts derived from trioxocarbonate (iv) acid when it reacts with metals and metallic oxides. All trioxocarbonate (iv) salts of Sodium (Na), Potassium (K) and Ammonium(NH4+) are soluble while all others are insoluble.
how many moles of nitroge are there in 50.0 g of nitrogen?
1.785714286 moles
The number of moles (n) for nitrogen is: [ n=50.0÷28.0 ] = 1.785714286 moles.
Production of 6.5 grams of C2H2 requires consumption of how many grams of H2O
Answer:
C
Explanation:
Grams 3/4
Answer:
9g
Explanation:
number of moles × the moleculars mass
Which structure could a scientist look for in a plant that would identify it as a club moss rather than a liverwort?
O phloem
O spores
O rhizoids
O flowers
Answer:
what e said
Explanation:
