Based on the distillation data provided, the percent recovery of ethanol is 66.7%
What is distillation?Distillation is a separation technique which is used to separate two miscible liquids based on differences in their boiling points.
At the boiling point of the first liquid, it distills over and is obtained by condensation.
The liquid obtained is known as distillate.
In the distillation of ethanol, the percent recovery is calculated as follows:
Percent recovery = (volume of distillate/volume of ethanol in mixture) × 100%From the data given:
Volume of distillate = 300 mlVolume of Ethanol in the mixture = 450 mlPercent Recovery = (300/450) × 100%
Percent recovery = 66.7%
Therefore, the percent recovery of ethanol is 66.7%.
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When heated, KClO3 decomposes into KCl and O2. 2KClO3⟶2KCl+3O2 If this reaction produced 17.4 g KCl, how many grams of O2 were produced? maSS
Answer:
12.6 g O2 or
12.60 g O2 (if needed two decimal places)
Explanation:
First convert grams into moles:
17.4 g KCl × 1
74.55
= 0.233 moles of KCl
Next solve for the mole of O2:
= 0.233 × 3 moles of O2
2 moles of KCl
= 0.3495 or
= 0.350 moles of O2
Finally convert the mole to grams:
= 0.350 moles of O2 × 36g
1 mole
= 12.6 g O2 or 12.60 g O2
Answer:
a car traveled 20m &400k/g
You open the refrigerator and take out a slice of leftover pizza. You put it in the microwave oven, turn it on, and watch for the cheese to start bubbling. You take a bite of the pizza and realize it is too hot, so you let it sit on the counter for a minute. When the pizza is finally cool enough to eat, you enjoy your lunch. Identify three examples of energy transfer in the scenario.
Pick up to 3 answers.
A. Electromagnetic (microwave) energy is transferred from the refrigerator to the pizza in the refrigerator.
B. Electromagnetic (microwave) energy is transferred from the microwave to the pizza in the microwave oven.
C. Heat energy is transferred from the pizza to the room as the pizza cools on the counter.
D. Heat energy from the warm pizza is transferred from the pizza into the mouth chewing it.
E. Heat energy from the room is transferred into the pizza as it comes out of the microwave oven.
Answer:
C,B,(D or A)
Explanation:
Why is the electron configuration for copper 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 1 instead
of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 9 4 s 2 ?
A The 4 s orbital has higher energy than the 3 d orbital.
B Electrons occupy orbitals of the highest energy levels first.
C A filled sublevel is more stable than a half-filled sublevel.
why are hydrocarbons insoluble in water
Answer:
Hydrocarbons are insoluble in water because they are non-polar compounds while water is a polar solvent. By principle, like dissolves like. Nonpolar solvents dissolve nonpolar solutes and polar solvents dissolve polar solutes.
Explanation:
please brainliest me
hope it helps
Hydrocarbons are insoluble in water because :-
1)Hydrocarbons are nonpolar whereas water is polar. (like dissolves like).
2) Hydrocarbons and water do not exhibit appropriate solvent-solute interactions. Hydrocarbons only form very weak dispersion forces whereas water produces strong polar hydrogen bonding interactions.
Explanation:
Hope it helps you!!
What is the percent of oxygen by mass in C2H402
Answer:
53.3 %.
Explanation: C2H4O2. = 2 * 12.011 + 4 * 1.008 + 2 * 15.999. = 60.052.
What is added to balance hydrogen and oxygen atoms in an oxidation-
reduction reaction in basic solution?
A. OH and H2O
B. Ht and H20
C. H2 and 02
D. OH and Ht
Answer:
OH^- and H_2O
Explanation:
Remember these things about basic and acidic medium
In acidic medium we add H+ to balance Hydrogen and H_2O for OxygenIn basic we add OH- which turns H+ to waterWhich statement is true about precipitation in biomes around the world.
Question 6 options:
The taiga has more precipitation than the deciduous forest biome.
Deciduous forest biome is second in precipitation to the tropical rainforests.
Coniferous forest biome has more precipitation to the Deciduous forest biome.
The desert biome has more precipitation to the Deciduous forest biome.
Answer:
i want to say it's
Explanation:
(B) but i don't know but did you ever figure out the anwser?
Answer:
Coniferous forest biome has more precipitation to the Deciduous forest biome.
Explanation:
What is the chemical name
for ca2 and clo3-
Answer:
Calcium chlorate | Ca(ClO3)2 - PubChem.
Explanation:
How to do Lewis structure for Al?
Notes:-
Al has Z=15electron configuration:-
[Ne]3s²3p³Valency is 3
So 3 dots are included
A 23.6 g sample of NagPO4 (molar mass 163.94 g/mol) is dissolved in enough water to produce
g
750. mL of solution.
Calculate the concentration of Nations in solution.
Taking into account the definition of molarity, the concentration of Na₃PO₄ in solution is 0.192[tex]\frac{moles}{lliter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{lliter}[/tex].
Concentration of Na₃PO₄ in solutionBeing the molar mass of Na₃PO₄ 163.94 g/mole, that is, the amount of mass that a substance contains in one mole, the amount of moles that contains 23.6 g sample of Na₃PO₄ is calculated as:
[tex]23.6 gramsx\frac{1 mole}{163.94 grams} = 0.144 moles[/tex]
Then you know:
number of moles= 0.144 molesvolume= 750 mL= 0.750 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]Molarity=\frac{0.144 moles}{0.750 L}[/tex]
Solving:
Molarity= 0.192[tex]\frac{moles}{lliter}[/tex]
Finally, the concentration of Na₃PO₄ in solution is 0.192[tex]\frac{moles}{lliter}[/tex].
Learn more about
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In the reaction between 15.8 g of NH3 and 22.7 g oxygen, water and nitrogen monoxide are
produced. Determine which reactant is limiting and calculate the number of grams of each
product.
Explanation:
limiting is NH3
NO:27/88g
H2O: 25/09g
Which bond links amino acids together?
glycosidic bond
hydrogen bond
phosphodiester bond
peptide bond
Answer:
Peptide Bonds
Explanation:
Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.
Write and balance tin and copper(ii) oxide react to form copper and tin IV oxide
Answer:
tin Is more reactive than copper so it reduces oxygen from copper
Help me plssssssssss
Answer:
The answer for this selection is 4
Explanation:
balancing equation plsss help
Answer:
The formula is : C3H8 + 5O2 → 3CO2 + 4H2O.
Explanation:
good luck
What metal speeds up rusting
Answer:
Vinegar
Explanation:
What liquid makes metal rust the fastest? Vinegar speeds up rusting because it contains a dilute form of acetic acid; positive hydrogen ions in the acid remove electrons from iron, ionizing it and making it susceptible to rust. How do you rust metal quickly?
Answer:
iron, especially if it is exposed to water and oxygen
A sample of excited atoms lie 3.314×10−19 J above the ground state. Determine the emission wavelength of these atoms.
The emission wavelength of the atoms excited above the ground state is 599.8 nm.
Emission wavelength of the atomsThe emission wavelength of the atom is determined by using the following formulas as shown below;
E = hf
E = hc/λ
where;
E is the energy of the atomh is Planck's constantc is speed of lightλ is the emission wavelengthλ = hc/E
λ = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (3.314 x 10⁻¹⁹)
λ = 5.998 x 10⁻⁷ m
λ = 599.8 x 10⁻⁹ m
λ = 599.8 nm
Thus, the emission wavelength of the atoms is 599.8 nm.
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PLEASE HELP!!!!!!!
You compare the gas generated from a reaction using two antacid tablets with the gas generated from a reaction using four antacid tablets (consider the antacid as the limiting reagent).
At constant pressure and temperature, how do the volumes of the gases compare?
The two reactions produce the same amount of gas.
The gas generated by four antacid tablets has a smaller volume.
The gas generated by two antacid tablets has a smaller volume.
Answer: The gas generated by two antacid tablets has a smaller volume.
Explanation:
Since the antiacid is the limiting reagent, we know that the more tablets there are, the more gas there will be.
This means that there will be more gas generated by the four antiacid tablets when compared to the two antiacid tablets, which gives us that the gas generated by the two antiacid tablets has a smaller volume.
What are the characteristics of nonvascular plants? (select all that apply) A . They don’t rely on roots to receive water.
B .They have xylem vessels and phloem vessels
C . They are able to push water and nutrients to each part of the plant.
D . They are found in moist environments.
Answer:
D . They are found in moist environments.
Explanation:
Nonvascular plants do not have a xylem or phloem, roots, stems, or leaves. Because these plants lack water-conducting tissues, they fail to achieve the structural complexity and size of most vascular plants and have evolved in habitats which allow their survival and reproduction.
The plant body that is most obvious in non-vascular plants are the the gametophyte generation. The gametophte gemeration is haploid.
The non-vascular plants grow in moist environments. It is due to lack of vascular tissue that requires to maintain close contact with water to prevent desiccation. Nonvascular plants are plants that do not have any special internal pipelines or channels to carry water and nutrients. Instead, nonvascular plants absorb water and minerals directly through their leaflike scales. Nonvascular plants are usually found growing close to the ground in damp, moist places. Non-vascular plants thrive in damp conditions since they don't need to rely on roots to acquire enough water.
(113) Fe, Co, and Ni are in a category of metals best known as
(A) Transition metals
(B) Alkali metals
(C) Rare metals
(D)Main group metals
(
Answer:
A
Explanation:
iron, cobalt and nickel are all transition metals
Calculate the pOH for a solution that has a hydroxide ion, (OH-) concentration of 5.02 X 10-4 M.
Calculate the pH.
Note: the answers should have three significant figures
Answer:
Explanation:
Calculate the pOH for a solution that has a hydroxide ion, (OH-) concentration of 5.02 X 10-4 M.
Calculate the pH.
Note: the answers should have three significant figures
A chemistry assignment has a student conduct a single replacement reaction by adding 7.5g of sodium metal to 20.0g of aluminum chloride. How much aluminum in moles would precipitate out as a result of the reaction
Answer: 0.109 mol
Explanation:
Balanced chemical equation:
3 Na(s) + AlCl3(aq) --> 3 NaCl(aq) + Al(s)
3 moles of sodium metal react with 1 mole of aluminum chloride to produce 3 moles of aluminum chloride and 1 mole of solid aluminum
Molar mass of Na = 22.99 g/mol
Mass(Na) = 7.5 g
Find number of moles of Na:
n = mass of Na/molar mass of Na
=(7.5 g)/(22.99 g/mol)
= 0.3262 mol
Molar mass of AlCl3,
MM = 1*MM(Al) + 3*MM(Cl)
= 1*26.98 + 3*35.45
= 133.33 g/mol
Mass(AlCl3) = 20.0 g
Find number of moles of AlCl3,
n = mass of AlCl3/molar mass of AlCl3
=(20 g)/(1.333*10^2 g/mol)
= 0.15 mol
Balanced chemical equation is:
3 Na + AlCl3 ---> Al + 3 NaCl
3 mol of Na reacts with 1 mol of AlCl3
for 0.3262 mol of Na, 0.1087 mol of AlCl3 is required
But we have 0.15 mol of AlCl3
So, Na is the limiting reagent and we will use it in our further calculations.
According to balanced equation:
mol of Al formed = (1/3) * moles of Na
= (1/3)*0.3262
= 0.1087 mol
Answer: 0.109 mol of aluminum will precipitate out as a result of the reaction
What type of energy transformation takes place during cellular respiration?
Use complete sentences to explain how energy is conserved during cellular respiration. (10 points)
Answer:
chemical energy transgormation takes place during cellular respiration
Which of the following mainly drives surface runoff?
A. magnetism
B. gravity
C. electricity
D. thermal energy
What happens when the temperature of a gas is increased?
O A. The boiling point will increase,
O B. The collisions between molecules will decrease,
O C. The volume will increase,
D. The pressure will decrease,
Arrange the following acids from strongest to weakest:
HF, HBr, HCl, HI
Answer:
HI>HBr>HCL>HF
Explanation:
A solution consists of 35.00 g of CuSO4 dissolved in 250.0 mL of water. The molar mass of Cu is 63.55 g/mol the molar mass of S is 32.07 g/mol, and the molar mass of O is 16.00 g/mol. What is the molarity of the solution?
Answer:
0.87708moldm-3
Explanation:
[tex]molar \: mass \: of \: cuso4 = 63.55 + 32.07 + 4(16.00) \\ =159.62gmol {}^{ - 1} \\ mole(n) = \frac{mass}{molar \: mass } \\ n = \frac{35}{159.62} \\ n = 0.21927mol \\ molarity = \frac{n}{v} \\ molarity = \frac{0.21927}{0.25} \\ molarity = 0.87708moldm {}^{ - 3} [/tex]
please help and show work will be picking brainliest
Answer:
34x4v
Explanation:
ik it is write
Gives 2 reaction in which benzene ring is retained and 2 reaction in which benzene ring is not retained
Hey dear,
Benzene is a 6-C cyclic structure with alternate double bonds.
● Reactions -
1) Benzene to cyclohexane -
Benzene can be reduced to cyclohexane with
the help of Ni/H2. C6H6 + 3H2 --> C6H12
All 3 double bonds in ring are reduced here.
2) Benzene to benzoquinone - Benzene can be oxidized to benzoquinone with
the help of acidic K2Cr207. C6H6 +3[O] --> C6H4O2 + H2O
Only 1 double bond is lost in this reaction.
Hope this helps you.
Question 13 options:
A) What is the volume (L) of 2.5 moles of oxygen at STP?
B) What is the volume (L) of 2.5 moles of nitrogen at STP?
At STP
one mol of oxygen weighs=22.4LNo of moles=2.5mol
Total volume:-
2.5(22.4)56L