Answer:
Percentage yield of O₂ = 73.4%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2KClO₃ —> 2KCl + 3O₂
Next, we shall determine the mass of KClO₃ that decomposed and the mass of O₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of KClO₃ = 39 + 35.5 + (3×16)
= 39 + 35.5 + 48
= 122.5 g/mol
Mass of KClO₃ from the balanced equation = 2 × 122.5 = 245 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 3 × 32 = 96 g
SUMMARY:
From the balanced equation above,
245 g of KClO₃ decomposed to produce 96 g of O₂.
Next, we shall determine the theoretical yield of O₂. This can be obtained as follow:
From the balanced equation above,
245 g of KClO₃ decomposed to produce 96 g of O₂.
Therefore, 400 g 245 g of KClO₃ will decompose to produce
= (400 × 96)/245 = 156.7 g of O₂.
Thus, the theoretical yield of O₂ is 156.7 g
Finally, we shall determine the percentage yield of O₂. This can be obtained as follow:
Actual yield of O₂ = 115.0 g
Theoretical yield of O₂ = 156.7 g
Percentage yield of O₂ =?
Percentage yield = Actual yield /Theoretical × 100
Percentage yield = 115/156.7 × 100
Percentage yield = 11500/156.7
Percentage yield of O₂ = 73.4%
Which statement is not true about the periodic table?
A. Elements in the same family have the same number of protons.
B. An element of the table is represented by a box with a symbol in it.
C. Elements in the same period of the periodic table have the same
number of electron shells.
D. It is organized by atomic number.
Elements in the same family have the same number of protons. This statement is not true about the periodic table. Therefore, option A is correct.
What is periodic table ?The chemical elements are arranged in rows and columns in the periodic table, sometimes referred to as the periodic table of the elements. It is frequently used in physics, chemistry, and other sciences and is frequently regarded as a symbol of chemistry.
The table can be used by scientists to anticipate chemical reactions, study trends in the periodic properties of certain elements, and speculate on the properties of yet-to-be-discovered elements. The elements are arranged in the contemporary periodic table according to their atomic numbers and periodic characteristics.
The periodic table has changed to represent more than 150 years of chemical and physics research and development.
Thus, option A is correct.
To learn more about the periodic table, follow the link;
https://brainly.com/question/11155928
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Fe-54 = 5.845%
Fe-56 = 91.754%
Fe-58 = 2.119%
Calculate the average atomic mass/given their percent abundance
Answer:
[tex]\boxed {\boxed {\sf 55.76756 \ amu}}[/tex]
Explanation:
The average atomic mass is the sum of the product of the given masses and their abundances. We have to complete two steps for each isotope, then add all the products together.
Fe-54
Convert the percent abundance to a decimal by dividing by 100.
5.845/100= 0.05845Multiply the abundance as a decimal by the mass number. This is the number after the element in the isotope symbol (54 amu).
0.005845 * 54=3.1563 amuFe-56
Convert the percent to a decimal.
91.754/100=0.91754Multiply the decimal by the mass number (56 amu).
0.91754 * 56= 51.38224 amuFe-58
Convert the percent to a decimal.
2.119/100=0.02119Multiply by the mass number (58 amu).
0.02119 * 58 = 1.22902 amuAverage Atomic Mass
Add all the products together to find the average atomic mass.
3.1563 amu + 51.38224 amu + 1.22902 amu =55.76756 amuThe average atomic mass given the percent abundance is 55.7656 atomic mass units.
A student is asked to seperate two liquids. Liquid A boils at 100°c and liquid B boils at 65°c. The student sets up a fractional distillation experiment, and after a few minutes a clear liquid is collected from the condenser. Explain which of the two liquids will be collected first. ( 2 marks).
Answer:
B
Explanation:
because B has a lower bp it needs less time and energy to turn into vapour and is collected into the condenser first
how many moles are in 6.4grams of copper
Answer:
One mole of copper atoms has Avogadro number of copper atoms i.e. 6.022×10
23
atoms.
Given the mass of Copper is 6.4g
Number of Copper atoms in 6.4g =
molar mass
given mass
×Avogadro number
=
63.55
6.4
×6.022×10
23
copper atoms
=6.064×10
22
copper atoms
Explanation:
explain why the boiling point of aluminum is higher than sodium
Explanation:
this is the reason why aluminium's boiling point is higher than that of sodium. sodium forms Na+ ions, therefore 1 electron is lost from each sodium atom, whereas aluminium forms Al3+ ions, so 3 electrons are lost for each Aluminum atom. The number of delocalised electrons therefore increases from sodium to aluminium, and charge density of the ions increases as the ionic charge increases and size decreases.
what are neutral salts
Answer:
Salts that produce acidic solutions are acid salts. Neutral salts are those salts that are neither acidic nor basic. Zwitterions contain an anionic and a cationic centre in the same molecule, but are not considered to be salts. Examples of zwitterions include amino acids, many metabolites, peptides, and proteins.
Explanation:
List twelve types of industry
Answer:
-Aerospace Industry.
-Transport Industry.
-Computer Industry.
-Telecommunication industry.
-Agriculture industry.
-Construction Industry.
-Education Industry.
-Pharmaceutical Industry.
-Food Industry
-Health Care Industry
-Hospitality Industry
-Entertainment Industry
what is average velocity with formula?
Answer:
total displacement \time
Explanation:
Balance equation for. _Mg + _H3(PO4) --_Mg3(PO4)2+ _H2
If I have 9.7 moles of gas at a pressure of 0.12 atm and at a temperature of 46°C, what is the volume of the
container that the gas is in?
Answer:
2117.02 litres
Explanation:
Using the ideal gas equation as follows;
PV = nRT
Where:
P = pressure of the gas (atm)
V = volume of the gas (L)
n = number of moles (mol)
R = gas law constant (Latm/molK)
T = temperature (K)
According to the information given in this question,
P = 0.12 atm
V = ?
n = 9.7moles
T = 46°C = 46 + 273 = 319K
R = 0.0821 Latm/molK
Using PV = nRT
0.12 × V = 9.7 × 0.0821 × 319
0.12V = 254.04
V = 254.04 ÷ 0.12
V = 2117.02 litres
Which would most likely be reduced when combined with Cu(s)?
A. Hg
B. Mg2+
C. Au+
D. Zn2+
Answer:
mg2+ because it is a very good idea
Which refers to substances that are complex molecules and contain carbon atoms bonded to hydrogen atoms?
o
O organic
O inorganic
ionic
metallic
Answer:
organic
Explanation:
Organic substances are those which contains covalently linked carbon to hydrogen (C-H) bonds in their structure. In other words, organic compounds or substances are uniquely composed of carbon and hydrogen atoms covalently linked together.
These substances usually contain a long chain of these bonds, hence, making them complex. Therefore, according to this question, substanves that are complex molecules and contain carbon atoms bonded to hydrogen atoms are referred to as ORGANIC SUBSTANCES.
Answer:
A. Organic
Explanation:
chapter 3 reactivity of metals mcq question and question and answer and important notes?
Answer:
resend again that question dear
Why is it essential for a calorimetry to be an insulated (closed) system?
A. The heat exchange must originate from only the reaction (system).
B. Thermal insulation minimizes energy loses to the atmosphere.
C. A and B
D. None of the Above
Answer:
B.Thermal insulation minimizes energy loses to the atmosphere.
Explanation:
It is important because it helps to stop hit from transferring from the calorimeter to the environment. This would help to have an accurate measurement of the heat that was used in the chemical process. The greatest cause of error that happens in calorimetry is when heat is lost to the environment. To reduce this, you insulate the calorimeter and add a cover.
an experiment was carried out and H2SO4 was collected resulting in a 92.0% yield. What mass of H2SO4 was collected from the experiment?
Answer:
The mass of H2SO4 collected is 92.0g assuming the theoretical yield of H2SO4 is 100g
Explanation:
Assuming the theoretical yield of the sulfuric acid, H2SO4, is 100g.
To solve this question we must use the equation of percent yield:
Percent yield = Actual yield / Theoretical yield * 100
Where percent yield = 92.0%, actual yield is the mass of H2SO4 produced and theoretical yield is 100g, the mass we are assuming
Replacing:
92.0% = Actual yield / 100g * 100
92.0g = Actual Yield
The mass of H2SO4 collected is 92.0g assuming the theoretical yield of H2SO4 is 100gHow is the relation between the volume and temperature? Explain.
According to kinetic-molecular theory, which of the following would not be considered an ideal gas? Check all that apply.
a gas at very high temperatures, when gas particles are moving very quickly
a gas at very low volumes, when gas particles are very close together
a gas at very low temperatures, when gas particles have very little kinetic energy
a gas at very low pressures, when gas particles are very far apart
a gas with highly polar molecules that have very strong intermolecular forces
Answer:
a gas at very low temperatures, when gas particles have very little kinetic energy
Explanation:
Answer:
B, C, and E!
Explanation:
got it correct on edge! :)
1:Which one of the following solutions shows no current flow in an electrolytic cell?
A: water solution of table salt
B: molten sodium chloride
C: hydrochloric acid solution
D: sugar solution
Answer: Sugar solution shows no current flow in an electrolytic cell.
Explanation:
Electric current is the flow of ions or charged species from one point to another.
A solution that does not contain any ions is not able to conduct electric current.
Water solution of table salt (NaCl) contains sodium and chlorine ions. So, an electric current can pass through it.Molten sodium chloride also contains sodium and chlorine ions. Hence, an electric current can pass through it.Hydrochloric acid solution contains [tex]H^{+}[/tex] and [tex]Cl^{-}[/tex] ions. So, an electric current can pass through it.Sugar solution does not contain ions as sugar only dissolves in water but do not dissociate into ions. Hence, current cannot flow through sugar solution.Thus,, we can conclude that sugar solution shows no current flow in an electrolytic cell.
In an atomic model that includes a nucleus, positive charge is
a
concentrated at multiple sites in an atom.
b
concentrated in the center of an atom.
c
spread evenly throughout an atom.
d
located in the space outside the nucleus.
10:38 Fri 9 Jul
ES
GCSE Science - Chemistry
2 of 15
Name the indicator that is red in acid and turns green when the solution becomes neutral.
|
Answer.
Universal indicator
Explanation.
Universal indicator has many different colour changes, from red for strongly acidic solutions to dark purple for strongly alkaline solutions. In the middle, neutral pH 7 is indicated by green.
Help me with this question
Prove that:-
1.The unit of pressure is a derived unit?
2.The unit of work is a derived?
Answer:01
When you describe nature, and you need standard, useful units for everything you will see that these units are linked. So you start with defining base units that are simple:
kg, meter, second, Kelvin, …
Now other units will be automatically derived:
speed = distancetime , so the unit is ms
acceleration = speedincreasetime , so the unit is ms2
Force = Mass x acceleration, so the unit is kg.ms2
Pressure is Force/surface, so the unit is kgm.s2
You can define new simple units for this, but they are still derived from the base units:
Force: 1N=1kg.ms2
Pressure: 1Pa=1kgm.s2
2 Answer
In mechanics, work is defined as “force x distance”. Since energy can be measured as work, we can write energy = force x distance. Thus SI derived unit of energy has the units of newtons x meter or kg m2/s
Zn-64 = 48.63%
Zn-66 = 27.90%
Zn-67 = 4.10%
Zn-68 = 18.75%
Zn-70 = .62%
Calculate the atomic mass/given their percent abundance
Answer:
A = 65.46 u
Explanation:
Given that,
The composition of zinc is as follows :
Zn-64 = 48.63%
Zn-66 = 27.90%
Zn-67 = 4.10%
Zn-68 = 18.75%
Zn-70 = .62%
We need to find the average atomic mass of the given element. It can be solved as follows :
[tex]A=\dfrac{48.63\times 64+27.90\times 66+4.1\times 67+18.75\times 68+0.62\times 70}{100}\\A=65.46\ u[/tex]
So, the average atomic mass of zinc is 65.46 u.
Can someone please do a True or false for these PLEASE
Answer:
true
false
false
true
false
true
true
false
false
true
true
Na3N decomposes to form sodium and nitrogen gas at STP. If 13.7 L of nitrogen is produced
how many moles of Na3N was used? (22.4 L = 1 mole of any gas)
2Na3N --> 6Na + N2
Answer: 1.224 moles of [tex]Na_3N[/tex] were used.
Explanation:
We are given:
Volume of nitrogen gas produced = 13.7 L
At STP conditions:
22.4 L of volume is occupied by 1 mole of a gas
Applying unitary method:
13.7 L of nitrogen gas will be occupied by = [tex]\frac{1mol}{22.4L}\times 13.7L=0.612mol[/tex]
For the given chemical reaction:
[tex]2Na_3N\rightarrow 6Na+N_2[/tex]
By Stoichiometry of the reaction:
1 mole of nitrogen gas is produced by 2 mole of [tex]Na_3N[/tex]
So, 0.612 moles of nitrogen gas will be produced from = [tex]\frac{2}{1}\times 0.612=1.224mol[/tex] of [tex]Na_3N[/tex]
Hence, 1.224 moles of [tex]Na_3N[/tex] were used.
Which compound is a glycol?
CH3―CH2―CH2―CHO
CH3—CH2—O—CH2—CH3
CH3—CH2—CH2—CH2OH
HOH2C―CH2―CH2―CH2OH
Answer:
CH3—CH2—O—CH2—CH3 is the compound of glycol.
Answer:
HOH2C―CH2―CH2―CH2OH is glycol
Explanation:
How to find the percentage abundance of isotope
Answer:
Answer below (in explanation)
Explanation:
First find the average atomic mass of the element in question (on the periodic table)
Set up the relative abundance formula: (M1)(x) + (M2)(1-x) = M(E)
Where M1 = Mass of the first isotope, X = Relative abundance, M2 = mass of the second isotope, M(E) = Atomic mass of the element
Plug in your values (i'll use nitrogen as an example) :
(background info: The mass of one isotope, nitrogen-14, is 14.003 amu and another isotope, nitrogen-15, is 15.000 amu, find the relative abundance of the isotopes.
14.003x + 15.000(1-x) =14.007
Use algebra and solve for X. First use distributive property, combine like terms, and solve for X.
It would equal X = 0.996. Multiply by 100 to get a proper percentage and the percentage abundance of Nitrogen-14 is 99.6%
This way of solving is limited to 2 isotopes only.
Done
True or false, If an atom is charged negative, it contains more electrons than protons.
Answer:
True
Explanation:
An atom would carry more protons if positively charged, an equal amount of both protons and electrons if neutral, and more electrons if charged negative.
Which drawing is structural model of C3H8?
Answer:
option B is the correct answer
classify each of the following solids as ionic,metallic, molecular, network (covalent)or amorphous?
1) Tetra phosphorous deicide(P4O10)
2)Graphite
3) Ammonium phosphate (NH4)3po4
4) Brass
5)SiC
6)Rb
7)l2
8)LiBr
9)P4
10) Plastic
11)Si
Answer;
P4O10 - molecular solid
Graphite - network solid
Ammonium phosphate - ionic
Brass - metallic
SiC - network solid
Rb- metallic
I2 - molecular
LiBr- ionic
P4 - molecular
Plastic - amorphous
Si - network
Explanation:
An ioinc solid is made up of a pair of oppositely charged ion held together by electrostatic interaction between the bonding species.
A covalent solid is a solid in which the atoms involved in the solid are bonded together by covalent bonds. Covalent solids are also molecular.
Metals are held together by interaction of metal ions and a sea of electrons. This is called the metallic bond.
A network solid is composed of covalently bonded atoms that repeat itself in a definite manner. E.g SiC
There are two types of automatic exposure control: photodiode and the more common parallel plate ionization chamber. How are they positioned
Answer:
Following are the response to the given question:
Explanation:
In the given question the automatic exposure is used as the management which is offered in two distinct methods: photodiode as well as the parallel ionizing tank. In both are positioned as the absolute pressure type is between the patient as well as the receptor, behind the image receptor the photoelectric is placed.