The percent yield of oxygen if 10.2 g of O₂ is produced from the decomposition of 17.0 g of H₂O is 67.6%.
How do we calculate moles from mass?Moles (n) of any substance can be calculated by using their mass as:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
2H₂O → 2H₂ + O₂
Moles of 17g H₂O = 17g / 18.02 g/mol = 0.943 moles
From the stoichiometry of the reaction it is clear that,
2 moles of H₂O = produces 1 mole of O₂
0.943 moles of H₂O = produces 1/2×0.943=0.471 mole of O₂
Now mass of this 0.471 moles of O₂ = (0.472mol)(32g/mol) = 15.104 grams
Actual mass of oxygen = 10.2g (given)
Now on putting vales on the percent yield formula, we get
% yield = (10.2 / 15.104)×100% = 67.53% = 67.6%
Hence the required value of percent yield is 67.6%.
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Answer:67.6
Explanation:bc im just that good
What is the length of the shaded grey area? write your answer to the correct number of significant digits. The unit is cm
Answer:
1.37cm
Explanation:
It's less than 1.4cm but more than 1.3cm. It's also more than 1.35cm so I guess the best answer would be 1.37cm or round up to 1.4cm
27.2g CuCl2 was dissolved in 2.50 L of the water. What is the molality of the solution?
Answer:
0.0800 (on CK-12)
Explanation:
Given grams of CuCl2/molar mass of CuCl2
27.2g/134.45g=0.2023...
Next,
0.2023mol/2.50L = 0.0800
The molality of the copper(II) chloride (CuCl₂) solution is 0.081 mol/kg
MolalityMolality is a measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent
First, we will determine the number of moles of CuCl₂ present
Using the formula,
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Mass of CuCl₂ = 27.2 g
Molar mass of CuCl₂ = 134.45 g/mol
∴ Number of moles of CuCl₂ present = [tex]\frac{27.2}{134.45 }[/tex]
Number of moles of CuCl₂ present = 0.2023 mole
Now, for the molality of the solution
Volume of solvent (water) = 2.50 L
Since the density of water = 1kg/L
Then, mass of the solvent (water) = 2.50 kg
[tex]Molality = \frac{Number\ of\ moles}{Mass\ of\ solvent}[/tex]
∴ Molality of the solution = [tex]\frac{0.2023}{2.50}[/tex]
Molality of the solution = 0.081 mol/kg
Hence, the molality of the solution is 0.081 mol/kg
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A teacher is discussing several scenarios in the topic of gas law s. Which of the following scenarios will the initial pressure be equal to the final pressure
The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.
Gay Lussac's lawGay Lussac's law states that at constant pressure, the volume of gas is directly proportional to the change in temperature. i.e. V ∝ T. From scenario 1 the change in temperature from 300 K to 600 K shows a 100% increase in temperature which corresponds with the expansion and size doubling of the volume of gas.
Hence we can conclude that The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.
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11
What is the ionic charge for an ion with 12 p* and 10 e?
A 0
B +2
C -2
D +1
Answer:
+2
Explanation:
10 e will 'balance ' 10 p then there is two + charges leftover
Pak Dollah who is long-sighted forgot to bring his glasses during breakfast in a restaurant. You are required to invent a lens to enable Pak Dollah to read the newspaper. Your invention must make use of the materials shown above.
Materials : Water Transparent plastic bottle and Water
A converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.
What is long-sightedness?Long-sightedness is an eye effect in which objects are not able to focus on the retina but behind the retina, therefore, near objects are not clearly seen except they are placed far away.
To correct long-sightedness, a suitable converging lens is used to bring the image to focus on the retina.
To construct a converging lens for Pak Dollah, the transparent plastic bottle is filled with water to serve as a converging lens and Pal Dollah will read through it.
Therefore, a converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.
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Sugar turns into black mass on heating Give reason
need fast
The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot. hope this helps
Sugar is made of carbon, hydrogen, and oxygen atoms. When heated over a candle, these elements react with the fire to turn into a liquid. The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.
S8(s) +
Cu(s) →
CuS(s)
Which formula(s) represent the reactant(s)?
Which formula(s) represent the product(s)?
Name the compound Cu2S.
What type of reaction is shown by the chemical equation?
Balance the chemical equation and write the coefficients in the space provided.
Answer:
Ox2 Cu03
Explanation:All from plato definetley correct
Hello people ~
Which of the following claims about crystal lattice diffraction patterns is correct?
a) Diffraction patterns possess a center of symmetry
b) Diffraction patterns doesn’t have center of symmetry
c) Diffraction patterns are linear space
d) Diffraction patterns contains α-rays
Answer:
a) Diffraction patterns possess a center of symmetry
Explanation:
They possess a center of symmetryDepending on this factor, they form patterns variablyWhy are primary and secondary alcohols relatively easy to oxidize.
Answer:
The oxidation of organic compounds generally increases the number of bonds from carbon to oxygen, and it may decrease the number of bonds to hydrogen. Encyclopædia Britannica, Inc. Secondary alcohols are easily oxidized without breaking carbon-carbon bonds only as far as the ketone stage.
Explanation:
i hope it was helpful
Help. I need to finish this in time for school tomorrow
A chemist is using a solution of hno3 that has a ph of 3.75. what is [h ] for the solution?
[tex]\text{pH} = -\log[H^{+}]\\\\\implies \log[H^{+}] = -\text{pH}\\\\\implies [H^{+}] = 10^{-\text{pH}}}\\\\\implies [H^{+}] =10^{-3.75}=0.00017~M[/tex]
which of the following is a reason to protect biodiversity?
Answer:
C. people rely on ecosystem services provided by intact ecosystems
Explanation:
:) Comment was correct! <3
Protecting and managing biodiversity resources is a crucial part of maintaining ecological harmony and ensuring the survival of species' future generations so that they can live long healthy lives. The correct option is C.
In order to stop the extinction of species, biodiversity should be protected. To keep nature in balance, it is conserved. Other organisms will suffer if one species in the food chain becomes extinct.
The systems that sustain all life on Earth, including humans, depend on biodiversity. We cannot have the healthy ecosystems that we depend on to give us the air we breathe and the food we consume without a diverse variety of animals, plants, and microorganisms.
Thus the correct option is C.
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Which of the following is the best description of a gaseous substance?
a. It has no shape of its own but has a definite volume.
b. It's the result of a chemical reaction involving two or more elements.
c. It holds its shape without outside restraint.
d. It has no definite shape or volume and will expand indefinitely.
correct answer - d (just took test)
Answer:
The answer is d.
"It has no definite shape or volume and will expand indefinitely."
Explanation:
Gaseous substances contain molecules that seriously want to move. These molecules take up any space that is free to the point where the substance will dissapate and lose its concentration. Aka, expand indefinitely.
Where are the sugars created during photosynthesis?
a. roots
b. stomata
c. chloroplasts
d. stem
Answer:
stroma part of chloroplast
Explanation:
The esophagus is a _______________ that passes food from your mouth to your ____________________. The stomach is the organ that ____________________ digestive juices to break down food.
Answer:
The answer is Muscle, Stomach, chews or sucks.
Explanation:
These are the roles they play.
A compound with the empirical formula CH 2 O has a formula mass of 180 g/mol. What is its molecular formula
Empirical formula mass
12+2(1)+1628+230g/molMolecular fornula mass:-180g/mol
n=Molecular formula mass/Empirical formula massm=180/30n=6Molecular formula:-
n×Empirical formula6(CH_2OC_6H_12 O_6Hydrogen gas, oxygen gas, and water vapor are collected in eudiometer. The eudiometer contains 0.00206 g of hydrogen, 0.0811 g of oxygen, and 0.0151 g of water vapor. The total pressure is 1101.1 mmHg. Calculate the partial pressure (in mmHg) of hydrogen gas.
For the partial pressure in mmHg of hydrogen gas is mathematically given as
partial p = 257.81mmHg
What is the partial pressure in mmHg of hydrogen gas?Generally, the equation for the partial pressure is mathematically given as
partial p = mole of H2/total moles x total pressure
H2 =0.00206/2
H2 = 0.00103
O2 = 0.0811/32
O2 = 0.00253
H20 = 0.0151/18
H2O = 0.000839
total moles = 0.00103+0.000839+0.00253
total moles = 0.00439
therefore
partial p = 0.00103/0.00439 x 1101.1
partial p = 257.81mmHg
In conclusion, the partial pressure in mmHg of hydrogen gas is
partial p = 257.81mmHg
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What is an example of electrical energy to heat energy? Question 3 options: Using a match to warm liquid Using a hotplate to boil water Growing plants in the window Mixing chemicals to produce heat
Answer:
using a hot plate to boil water
Explanation:
the others require a chemical reaction to produce heat
What else is produced during the replacement reaction of magnesium and hydrochloric acid? mg 2hcl h2 ________ mgcl2 mg2cl2 mg2cl mgcl
During the replacement reaction of magnesium and hydrochloric acid MgCl₂ is produced with hydrogen gas.
What is replacement reaction?Replacement reactions are those reactions in which one entity from the one of the reactant will replace by another entity for the formation of the product.
Balanced chemical reaction between magnesium and HCl will be represented as:
Mg²⁺ + 2HCl → MgCl₂ + H₂
In the baove reaction magnesium displaces hydrogen atom from the acid molecule.
Formation of Mg₂Cl₂ is impossible because valency of magnesium is not satisfied in this.Formation of Mg₂Cl is also impossible because valency of magnesium is not satisfied in this.Formation of MgCl is also impossible because valency of magnesium is not satisfied in this, as valency of Mg is +2 and of Cl is -1.Hence MgCl₂ is produced in the reaction.
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What are the conditions for STP?
Answer:
STP is Standard temperature and Pressure, which are o degrees C and 1.013 x 10^5 Pascals. At those values, one mole of any ideal gas occupies 22.41 litres.
Do you think three weeks (21 days) is enough time to observe all of the Moon’s phases? Why or why not?
Answer:
No, because the moon takes about 27 days to fully orbit which means that 3 weeks would not be enough to see all of the moon's phases, but if you think that you don't need 27 days due to the fact that some of the days there may not be a phase change then that is completely up to you.
Explanation:
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
Calculate the mass in grams of 3. 29 x 104 mol of lithium
Help please?
Answer
no. of moles =
[tex] \frac{mass \: {g} \: }{ \: molecular \: wight} [/tex]
so, mass (g)= no. of moles × molecular wight
Explanation:
Li molecular wight equal to 6.941
mass (g)=3.29×104 mol ×6.941 =2374.93g of lithium
Adam observed properties of four different waves and recorded observations about the frequency and volume of each one in his chart. which statement could adam declare based on the data in the table? only the sound quality of waves y and z can be compared. the sound quality of all of the waves can be compared. the sound quality of waves w and x can be compared. the sound quality for these waves cannot be compared.
Adam observed properties of four different waves and the sound quality of all of the waves can be compared.
What are waves?Waves is the propagation system of any matter in the upside and downside direction from the mean position.
Quality of sound waves will be measured by using the decibel unit which gives idea about the intensity of the sound in terms of loudness. And intensity of the sound waves is also be calculated by using the frequency in the given table frequency and decibel unit of four waves are given.
So we are able to compare the sound quality of all given waves and image of table is attached below.
Hence the sound quality of all of the waves can be compared.
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Answer:
The Answer is B
Explanation:
Took it on Edge
Which substance has the lowest [h ] concentration but is still considered an acid? milk blood gastric fluid household lye
The substance which has H⁺ concentration but is still considered an acid is milk.
How concentration of H⁺ determine acidity?Acidity of any substance will be calculated by using the pH scale and pH is define as:
pH = -log[H⁺]
Among the given substances pH of them are in range of:
Milk: pH = 6.5 - 6.7Blood: pH = 7.35 = 7.40Gastric fluid: pH = 1.5 - 3.5Household lye: pH = 13.5pH scale ranges from 0 to 14, where 0 to 6.9 shows the acidity, 7 shows the neutrality and from 7.1 to 14 shows the basicity of the solution. From the given pH values it is clear that lye is highly basic and gastric fluid is highly acidic. And blood has slight basic nature and due to the presence of lactic acid milk has very low concentration of H⁺ ions and considered as acid.
Hence milk is the correct answer.
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What is the molarity of a solution that contains 200. 0 g of lithium chloride in 450 mL? molar mass of chloride= 42. 394g/mol
Explanation:
Sol. 450 ml there is LiCl 200 g
Sol. 1000 ml there is LiCl 200/450×1000
= 444.44 g
Molar = g/molar mass = 444.44/42.394 = 10.48 M
0.2 pts A molecule in which the central atom forms one double bond and two single bonds is said to have a ________ shape.
Answer:
Trigonal planar
Explanation:
Formaldehyde is a great example of this shape.
The central Carbon has a double bond with an Oxygen and two single bonds with Hydrogens
A d1 octahedral complex is found to absorb visible light, with the absorption maximum occurring at 509 nm. Calculate the crystal-field splitting energy, δ , in kj/mol
The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the crystal-field splitting is 235kJ/mol.
What is crystal field splitting energy?The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the spliting is obtained from the wavelength in the visible spectrum.
Now the wavelength is 509 nm hence the energy is obtained from;
E = 6.6 * 10^-34 * 3 * 10^8/509 * 10^-9 * 6.02 * 10^23/1 mol * 1/1000 kJ
= 235kJ/mol
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Ionic bonds result from elements_____.
A. that form polar bonds
B. that share electrons
C. with high electronegativity differences
D. that are only nonmetals
Answer:
With high electronegativity differences
Explanation:
Ionic bond usually forms in between metals and non metalsIn solution they can contain electricityFor exam ple
NaCl,KCl,KBrWhat is the difference between isopropyl alcohol and rubbing alcohol.
Answer:
The main difference between isopropyl alcohol and rubbing alcohol is the concentration. The concentration of isopropyl alcohol is 100%, while the concentration of rubbing alcohol is less because of the addition of water. Otherwise, the two liquids have similar properties.
Explanation:
Hope this helps
I need help in this question
Answer:
D) is the correct answer.
Explanation:
[tex]na2co3 - > na2o + co2[/tex]