If 154.9 grams of KOH exactly neutralizes 262 mL of an aqueous HCl solution, what is the concentration of the HCl solution
Answer:
10.5M HCl
Explanation:
Using the chemical reaction:
KOH + HCl → H₂O + KCl
Where 1 mol of KOH reacts per mole of HCl
We can solve this problem converting the mass of KOH to moles using its molar mass. The moles of KOH added are equal to moles of HCl in the solution. That is:
Moles KOH = Moles HCl
154.9g KOH * (1mol / 56.1g) = 2.761 moles
The molarity of the solution (Moles HCl per liter of solution) is:
2.761moles HCl / 0.262L =
10.5M HClHow many atoms is 3.2 mol phosphorus?
Answer:
I think 4 I'm not completely sure
Explanation:
I hope it's right
Which of these is a carbohydrate?
1. C6 H12 O6
2. C6 H6 O12
3. C6 H13 O2 N
4. C3 H7 O2 Ns
Answer:
C6H12O6
Glucose
Explanation:
Glucose is a monocarbohydrate
carbohydrates always have only C, H, and O
brainliest plz
Mark the statements which are correct. A. All of the following elements are expected to gain electrons to form ions in ionic compounds: Ga, Se and Br. B. The symbols for the elements magnesium, aluminum and xenon are Mn, Al and Xe, respectively. C. The metals Co, Cu and Ti all require Roman numerals in the names of their compounds. D. The elements Co, Ni, and Hg are all transition elements.E. The elements P, As, and Bi are in the same family on the periodic table.
Answer:
The metals Co, Cu and Ti all require Roman numerals in the names of their compounds.
The elements Co, Ni, and Hg are all transition elements.
The elements P, As, and Bi are in the same family on the periodic table.
Explanation:
Transition elements are those which changes their charges as they bond with other elements or forms a compound with other elements. They show transitional behavior when they bond. Some of the transition elements are :
Chromium, Titanium, cobalt, mercury, copper, iron, vanadium, zinc, Silver, etc.
The transition elements use roman numerals in their names of the compounds.
Therefore, Cobalt (Co), Copper (Cu) and Titanium (Ti) are the elements that require a Roman numeral in the names of their compounds.
The elements Phosphorus (P), Arsenic (As) and Bismuth (Bi), they all belong to the nitrogen family of Group 15 (Va).
A beaker contains 5.78 ml of water what is the volume in gallons
Answer:
[tex]0.00153\ \text{gallons}[/tex]
Explanation:
[tex]1\ \text{milliliter}=0.000264172\ \text{gallons}[/tex]
The given volume of water is [tex]5.78\ \text{milliliters}[/tex]. So,
[tex]5.78\ \text{milliliters}=(5.78\times 0.000264172)\ \text{gallons}[/tex]
[tex]=0.00153\ \text{gallons}[/tex]
The volume of the given water in gallons is [tex]0.00153\ \text{gallons}[/tex].
Help me answer this please
Are the electrons in the following redox reactions transferred completely from the atoms of one element to the atoms of another or are they only partially transferred?
a. Ca(s) + Cl2(g) → CaCl2(s)
b. 4Cu(s) + O2(g) → 2Cu2O(s)
The electrons, in redox reaction get partially transferred by one to another element.
What is redox reaction?A redox reaction occurs when the oxidation states of the substrate change. The loss of electrons or maybe an increase in the oxidation state of a chemical and its atoms is referred to as oxidation. The gain of electrons or a reduction in the oxidation state of either a chemical or its atoms is referred to as reduction. The oxidation as well as reduction process can be seen in same reaction which is introduced as redox reaction.
What is electrons?
Electron can be considered as sub atomic particle which carry negative charge on it.
The given reactions are:
a. Ca(s) + Cl2(g) → CaCl2(s)
b. 4Cu(s) + O2(g) → 2Cu2O(s)
After transferring two electron in both reaction Ca and Cu it will form CaCl2 and 2Cu2O.
Therefore, after transferring partially electrons one elements get converted into another kind of molecule
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Please help me understand this!!!! "Drag and drop each element symbol to its correct location on the dichotomous key".
Symbols
Br Li As Ca Sb Mg Mn V Na K Sc I S Y
Answer:
1. Conductors (Yes) : Li, Ca, Mg, Mn, V, Sc, Y, Na, K
a) Energy level 2 = Li
b) Energy level 3: Na, Mg
b. (i) One valence electron = Na
b. (ii) Two valence electrons = Mg
2. Conductors (No) : Br, I, S, As, Sb
a) Energy level 3 = S
b) Energy level 4: Br, As
b. (i) Seven valence electrons = Br
b. (ii)Five valence electrons = As
Explanation:
Conductors are elements which are able to conduct heat and electricity easily. They are usually metallic elements.
From the list of elements, the metals are: Li, Ca, Mg, Mn, V, Sc, Y, Na, K.
From the list of conductors, Li alone has the energy level of 2.
Na and Mg both have energy level of 3 but Na has one valence electron while Mg has two.
Non-conductors or poor conductors do not allow either heat or electricity to pass through them easily. They are usually the non-metals and semimetals or metalloids.
From the list of elements, the poor conductors are: Br, I, S, As, Sb
Only the element S, has an energy level of 3. Both Br and As have energy levels of 4 each. However, Br has seven valence electrons while As has five valence electrons.
The elements identified can be used to fill the dichotomous key attached below.
Hydrobromic acid dissolves solid iron according to the
following reaction:
Fe(s) + 2 HBr(aq) → FeBr2(aq) + H2(9)
Part A
What mass of HBr (in g) would you need to dissolve a 3.2 - g pure iron
Express your answer using two significant figures.
Part B
What mass of H, would be produced by the complete reaction of the iron
Answer:
A. 9.3 g
B. 0.11 g
Explanation:
Fe(s) + 2HBr(aq) → FeBr₂(aq) + H₂(g)PART A
First we convert 3.2 grams of pure iron into moles, using its molar mass:
3.2 g ÷ 55.85 g/mol = 0.0573 mol FeNow we convert 0.0573 moles of Fe into moles of HBr, using the stoichiometric coefficients:
0.0573 mol Fe * [tex]\frac{2molHBr}{1molFe}[/tex] = 0.115 mol HBrFinally we convert 0.115 moles of HBr into grams, using its molar mass:
0.115 mol HBr * 80.91 g/mol = 9.3 g HBrPART B
This time we convert the 0.0573 moles of Fe from last time into H₂ moles:
0.0573 mol Fe * [tex]\frac{1molH_2}{1molFe}[/tex] = 0.0573 mol H₂Finally we convert H₂ moles into grams:
0.0573 mol H₂ * 2 g/mol = 0.11 gPlease help me, im studying for finals and i need an answer to this question! Will mark brainliest for the best answers!w
Answer:
the generation of electricity and other energy jointly, especially the utilization of the steam left over from electricity generation to produce heat.
I hope it helps!! Have a nice day
Answer:
Cogeneration r is the use of a heat engine or power station to generate electricity and useful heat at the same time.
What process is represented by the letter on the diagram?
A: ____________________________________________
B: ____________________________________________
C: ____________________________________________
D: ____________________________________________
E: ____________________________________________
Explanation:
I don't really understand the question
How will an increase in the average yearly ocean temperature most
likely affect Earth's weather?
Answer:
I'd Say B
Explanation:
How many grams of CoCl2 in 1/2 liter would be used to make a 1.0 molar solution? (can you show steps please?)
Answer:
The answer I think that is correct is 65g
There are 49.5g of CoCl2 in 1/2 liter used to make a 1.0 molar solution. Details about how to calculate molar concentration can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.
However, the number of moles of CoCl2 must be calculated using the following formula:
no of moles = 0.5L × 1M
no of moles = 0.5moles
Molar mass of CoCl2 = 99g/mol
mass of CoCl2 = 0.5 × 99
mass of CoCl2 = 49.5g
Therefore, there are 49.5g of CoCl2 in 1/2 liter used to make a 1.0 molar solution.
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The dosage for an antibiotic is prescribed at 8.0 mg per kilogram of body weight taken it twice daily for 2 weeks what total mass of antibiotic will be taken by a 180 lb person for the two week period?
Answer:
18.2784 g
Explanation:
First we convert 180 lb to kg:
1 lb = 0.453 kg180 lb * 0.453 kg / lb = 81.6 kgNow we calculate the mass of antibiotic taken in one day:
8.0 mg/kg * 81.6 kg = 652.8 mgGiven that it is taken twice daily, in one day the person would take (652.8 * 2) 1305.6 mg. In grams that mass would be:
1305.6 mg / 1000 = 1.3056 gFinally we multiply those 1.3056 daily grams by the 14 days in two weeks:
(1.3056 g) * 14 = 18.2784 gThe total mass of the antibiotic taken by a 180 lb person for the two-week period would be 18,252.8 mg.
An antibiotic is a type of antimicrobial substance used to treat bacterial infections. It is a medication that either inhibits the growth of bacteria or kills them outright.
Antibiotics work by targeting specific structures or functions in bacterial cells, disrupting their ability to replicate or causing them to die. They are an essential tool in modern medicine for treating various bacterial illnesses and have significantly contributed to improving human health by reducing the impact of infectious diseases.
To calculate the total mass of the antibiotic taken by a 180 lb person for a two-week period,
Convert the person's weight from pounds to kilograms:
Weight in kilograms = 180 lb × 0.453592 kg/lb
= 81.65 kg
Daily dosage = 8.0 mg/kg × 81.65 kg
= 653.2 mg
Total dosage for two weeks = Daily dosage × 2 (twice daily) × 14 (days)
= 18,252.8 mg
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How many atoms would be found in 4.65mol of Og? *
Answer:
nzbjsnjjdjsj
Explanation:
nzjsnxjsjnBua ahjsbs hJbsjs jznnsjs
(100 PTS NEED HELP ASAP)
Water waves are surface waves. The energy of the waves moves...
only perpendicular to the motion of the wave
only parallel to the motion of the wave
both parallel and perpendicular to the wave
Answer:
Explanation:
Waves are actually energy passing through the water, causing it to move in a circular motion. ... This phenomenon is a result of the wave's orbital motion being disturbed by the seafloor.
The direction a wave propagates is perpendicular to the direction it oscillates for transverse waves. A wave does not move mass in the direction of propagation; it transfers energy.
what effect does hybridization have on bonds
The lithosphere ______ part of the earth’s crust.
A. Gaseous
B. Solid
C. Water
D. Liquid
Answer:
The lithosphere solid part of the earth's crust
Safurared Solution changes into Unsaturated
by heating
Answer:
Yes it is because heating expands molecules of solution which helps to form a solution as it acts as solvent solution.
Explanation:
The bond angles around a carbon in a
triple bond are
and it
is
hybridized
A. 180, sp?
B. 120, sp
C. 180, sp
D. 120, sp?
Enter
The bond angles around carbon in the triple bond are 180 degrees and it is sp hybridized. option B is correct
What is sp hybridization?This hybridization process involves mixing the valence s orbital with one of the valence p orbitals to yield two equivalent sp hybrid orbitals that are oriented in a linear geometry.
The set of sp orbitals appears similar in shape to the original p orbital, but there is an important difference. The number of atomic orbitals combined always equals the number of hybrid orbitals formed.
The p orbital is one orbital that can hold up to two electrons. The sp set is two equivalent orbitals that point 120° from each other. The two electrons that were originally in the s orbital are now distributed to the two sp orbitals, which are half filled.
Therefore, due to the sp hybrid and 120-degree angle option B is correct
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HELP!!!! ILL GIVE THE CROWN THINGY THING!!!!!!!!!! DUE SOON!!!!!!!!! PLS HELP!!!!!!!!!!
Why must many of the telescopes that detect invisible wave, such as infrared, microwaves, and gamma rays, be placed in space?
a Most radiation reaching Earth from space is blocked by the atmosphere. Therefore, some telescopes must be placed above the atmosphere.
b There are not enough places on land to build observatories that hold large telescopes.
c All telescopes must be placed in space. There are not telescopes on land.
d The waves in the electromagnetic spectrum are all too small to be detected by telescopes on land. Therefore, in order to see any EM radiation, telescopes must be placed in space.
Answer: A. Most radiation reaching Earth from space is blocked by the atmosphere. Therefore, some telescopes must be placed above the atmosphere.
Explanation: Astronomers have a huge problem detecting radiation from space because the Earth's atmosphere blocks most of it and stops it from reaching the surface.
Hope this helps :)
What is the concentration in %v/v of a solution containing 3.2 L of ethanol in 6.5 L of solution?
Answer: Have a nice dAy?
Explanation: I thought i knew but nvm sorry
can't copy it so here
Answer:
First, third, and sixth
Explanation:
Please help I will mark you brainiest
Answer:
Ethylene glycol is a syrupy liquid at room temperature whereas polyethylene glycol is a solid material. The main difference between ethylene glycol and polyethylene glycol is that ethylene glycol has a fixed value for molecular weight whereas polyethylene glycol has no fixed value for molecular weight.
label the sun. which layer of the sun is #6?
Answer: Corona
Explanation: hope this help
What would happen to our solar system if the Sun had an even greater mass than it currently does?
Answer: If the Sun had an even greater mass then it currently does, it would have a larger gravitational pull and since it's heat would be closer to Earth, both by magnitude and gravity, life on Earth wouldn't be possible and life on Mars would be reality. Also, when the sun would explode, it would have a larger supernova and possibly create a white dwarf (something that only happens to red supergiant stars when they die), with a gravitational force so strong it wold have two beams of light coming out it's north and south poles (like a black hole).
I hope this helps!
2 NaOH + H2SO4 → 2 H2O + Na2SO4
How many grams of water are produced from 203.50 grams of H2S04?
Answer:
[tex]m_{H_2O}=74.8gH_2O[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction, it is possible to realize there is a 1:2 mole ratio of sulfuric acid to water; thus, given the mass of the former and its molar mass (98.07 g/mol), it is possible to determine the mass of produced water as shown below:
[tex]m_{H_2O}=203.50gH_2SO_4*\frac{1molH_2SO_4}{98.07gH_2SO_4}*\frac{2molH_2O}{1molH_2SO_4} *\frac{18.02gH_2O}{1molH_2O}\\\\m_{H_2O}=74.8gH_2O[/tex]
Regards!
write down the used of hydrogen gas
Answer:
Nearly all of the hydrogen consumed in the United States is used by industry for refining petroleum, treating metals, producing fertilizer, and processing foods. U.S. petroleum refineries use hydrogen to lower the sulfur content of fuels.
Explanation:
Hope it helped brainlist plz:)
Calculate the pH of the buffer solution comprised of 0.20 M HCHO2 and 0.15 M NaCHO2. (Ka for HCHO2 = 1.8 x 10-4)
Answer:
3.62
Explanation:
Using the Henderson-Hasselbach equation:
pH = pKa + log[base]/[acid]
pH = -log(1.8 x 10^-4) + log(0.15/0.20) = 3.62
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of of the buffer solution comprised of 0.20 M HCHO₂ and 0.15 M NaCHO₂. (Ka for HCHO2 = 1.8 x 10⁻⁴) is 3.62. pH is a unitless quantity.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
Using the Henderson-Hassel Bach equation:
pH = pKa + log[base]/[acid]
pH = -log(1.8 x 10^-4) + log(0.15/0.20) = 3.62
Therefore, the pH of of the buffer solution comprised of 0.20 M HCHO2 and 0.15 M NaCHO2. (Ka for HCHO2 = 1.8 x 10-4) is 3.62.
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Linnaeus created seven levels of classification.
What are the names of the seven levels?
Select all correct answers.
Animalia
Protista
Kingdom
Order
Phylum
Organism
Fungi
Family
Class
Species
Line
Genus
Wine goes bad soon after opening because Ethanol (CH3CH2OH) dissolved in it reacts with oxygen (O2) gas to form water and Aqueous Acetic acid (CH3COOH) The main ingredient of vinegar. Calculate the moles of water produced by the reaction of 0.060 mol of oxygen
Answer:
[tex]0.060molH_2O[/tex]
Explanation:
Hello there!
In this case, since the chemical reaction between ethanol and oxygen to water and acetic acid is:
[tex]CH_3CH_2OH+O_2\rightarrow CH_3COOH+H_2O[/tex]
Thus, since there is a 1:1 mole ratio between oxygen and water, the produced moles of water are calculated down below:
[tex]0.060molO_2*\frac{1molH_2O}{1molO_2}=0.060molH_2O[/tex]
Best regards!
