Answer:
the enantiomeric excess of the mixture is 40%
Explanation:
The computation of the enantiomeric excess of the mixture is shown below:
As we know that
[tex]= |\frac{R - S}{R + S} |\times 100\\\\= |\frac{70 - 30}{70 + 30}| \times 100\\\\= 40\%[/tex]
Hence, the enantiomeric excess of the mixture is 40%
Can someone please help me with this I’ll mark brainliest, in the boxes below label what level of organization might look like?
Answer:
Vascular tissue transports water, minerals, and sugars to different parts of the plant. Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem.
Explanation:
HOPE THIS HELPS!
Which is mainly responsible for preventing erosion?
A) Mining
B) Farming
c) Rooting of Plants
D) Logging
Answer:
B. Farming
Explanation:
What do atoms make up
Plz help it over science stuff
Find the molarity of the following solution:
734 grams of lithium sulfate (Li2SO4) is dissolved to make 2.5 liters of solution.
Answer:
2.67 M
Explanation:
Molarity, which is the molar concentration of a substance, can be calculated using the formula;
M = n/V
Where;
M = molarity (M)
n = number of moles (mol)
V = volume (Litres)
Based on the provided information in this question, mass of lithium sulfate (Li2SO4) = 734g, volume = 2.5L
Using mole = mass/molar mass
Molar mass of Li2SO4 = 7(2) + 32 + 16(4)
= 14 + 32 + 64
= 110g/mol
Mole = 734/110
Mole (n) = 6.67moles
Molarity = n/V
Molarity = 6.67/2.5
Molarity = 2.668
Molarity of Li2SO4 in the solution is 2.67 M
Answer:
The molarity of the solution is 2.672[tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity (M) is a way of expressing the concentration of solutions. It is defined as the number of moles of solute per volume of solution. The Molarity of a solution is determined by the following expression:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Being the molar mass of Li₂SO₄ 109.94 g/mol, then you can apply the following rule of three: if 109.94 grams are present in 1 mole, 734 grams will be present in how many moles?
[tex]amount of moles=\frac{734 grams*1 mole}{109.94 grams}[/tex]
amount of moles= 6.68 moles
Then:
number of moles= 6.68 molesvolume= 2.5 LReplacing in the definition of molarity:
[tex]Molarity=\frac{6.68 moles}{2.5 L}[/tex]
and solving you get:
Molarity= 2.672[tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 2.672[tex]\frac{moles}{liter}[/tex]
You need to produce a buffer solution that has a pH of 4.97. You already have a solution that contains 10. mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution?
Answer:
16.9 mmoles are needed to add to the solution
Explanation:
To solve this, we can apply the Henderson Hasselbach equation:
Acetic acid → CH₃COOH
CH₃COOH + H₂O ⇄ CH₃COO⁻ + H₃O⁺ Ka
That is the acid base equilibrium, to determine the amount:
pKa of acetic acid is 4.74
Henderson Hasselbach formula is:
pH = pKa + log (base/acid)
We replace → 4.97 = 4.74 + log (B / 10mmoles)
Let's verify mmoles of B
4.97 - 4.74 = log (B/10)
0.23 = log (B/10)
10^(0.23) = 10^(log (B/10)
1.698 = B/10
B = 1.698 . 10 → 16.9 mmoles
Explain why fluorine and chlorine are in the same group of the periodic table.
Give the electronic structures of fluorine and chlorine in your explanation.
Answer:
They both have 7 electrons in their outer shell
Complete the following reaction: Li + S -->
Answer:
Li2S
Explanation:
Hope this helps.
Answer:
can u do an real answer pls so i can help u thanks
HELPPPPPPPPPPPPPPPPPPPPPP PLZ
While cleaning my room, I use 5 Newtons of force to lift a board game from the floor to the shelf in my closet that's 2 meters high. How much work was done on the board game?
10 Joules
10 Watts
2.5 Watts
2.5 Joules
10 joules
hope that helps^^
Answer:
10 joules im not sure tho
Find the molecular mass of
MgSO4 7H₂O.
Answer:
MgO +H2SO4
Explanation:
use photomath
dicotyledonous plants
The dicotyledons, also known as dicots, are one of the two groups into which all the flowering plants or angiosperms were formerly divided. The name refers to one of the typical characteristics of the group, namely that the seed has two embryonic leaves or cotyledons.
Each polysaccharide tested gives different color results with the iodine test
Ethical Behavior Worksheet Situation 1. You are taking a very difficult chemistry course, which you must pass to maintain your scholarship and to avoid damaging your application for graduate school. Chemistry is not your strong suit, and, because of a just-below-failing average in the course, you will have to receive a grade of 90 or better on the final exam, which is two days away. A janitor, who is aware of your plight, informs you that he found the master for the chemistry final in a trash barrel and has saved it. He will make it available to you for a price, which is high but which you could afford. What would you do?
Answer:
I would not accept it.
Explanation:
Although it is tempting to accept the janitor's offer and save the scholarship, which is not easy to get, I would not accept his offer, as I do not believe in victories based on dishonesty and would be heavy on conscience if I did the opposite. Obviously, I would not like to lose my scholarship and for that reason, I would look for other ways that would be honest and help me improve my grade. If I could not improve and lose the scholarship, I would be extremely sad, but I would be at peace with my conscience.
A 32.4 L gas sample at STP is compressed to a volume of 28.4 L, and the temperature is increased to 352 K. What is the new pressure of the gas in atmospheres
Answer:
1.47 atm
Explanation:
Step 1: Given data
Initial volume (V₁): 32.4 LInitial pressure (P₁): 1 atm (standard pressure)Initial temperature (T₁): 273 K (standard temperature)Final volume (V₂): 28.4 LFinal pressure (P₂): ?Final temperature (T₂): 352 KStep 2: Calculate the final pressure of the gas
We can calculate the final pressure of the gas using the combined gas law.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
P₂ = P₁ × V₁ × T₂ / T₁ × V₂
P₂ = 1 atm × 32.4 L × 352 K / 273 K × 28.4 L = 1.47 atm
How many moles of N2 is 25.92g of N2?
Explanation:
number of moles = mass /relative molecular mass
n = 25,92/mr(N2)
n=25,92/14×2
n=25,92/28
n=0.93moles
Consider the following chemical equilibrium:
2H2(g) + O2 ⇌ 2H2O(l)
Now write an equation below that shows how to calculate Kc from Kp for this reaction at an absolute temperature . You can assume is comfortably above room temperature.
Answer:
hmm i dont know but i can try mate!
Are there any types of tissues that you think humans might have that are similar to plant’s vascular tissues? Help please
The types of tissues that you think humans might have that are similar to plant’s vascular tissues - is connective tissues of circulatory tissues.
A plant's vascular tissues transport nutrients throughout the plant, just as the circulatory system transports nutrients throughout the human body.
Vascular tissue is comprised of the xylem and the phloem, the main transport systems of plants.Xylem - transport of water and dissolved ions from the roots upwards through the plant.Phloem - transport of nutrients from leaves to other body parts.Connective tissue in the human :
is of four types mainly; blood, bones, cartilage, and connective tissue proper.Blood is the connective tissue that transports gases, nutrients.Blood also transports waste or toxic moleculesThus, the types of tissues that you think humans might have that are similar to plant’s vascular tissues - is connective tissues of circulatory tissues.
Learn more about the circulatory system:
https://brainly.com/question/22258254
The average adult heart pumps about 84./mLs of blood at 72 beats per minute. Suppose you need to calculate how long it would take the average heart to circulate 1700.mL of blood. Set the math up.
Answer:
1700 mL / 84 mLs
Explanation:
Given that:
Volume of blood pumped per minute = 84 /mLs
Time it takes to circulate 1700 mL of blood :
Time taken = Volume of blood circulate / Rate
Hence, to circulate 1700 mL of blood :
Time taken = 1700 mL / 84 mLs
The following conditions must be met before a standard calibration curve equation can be used to solve for the concentration of an unknown solution:
a. The same instrument must be used to measure the unknown solution as was used to measure the known (standard) solutions that were used to create the calibration curve.
b. The analyte in the unknown solution must be the same analyte (or type of analyte) that is present in the known (standard) solutions that were used to create the calibration curve.
c. The equation from the calibration curve can only be linear.
d. Domain and range restrictions must be observed.
Answer:
The same instrument must be used to measure the unknown solution as was used to measure the known (standard) solutions that were used to create the calibration curve.
The analyte in the unknown solution must be the same analyte (or type of analyte) that is present in the known (standard) solutions that were used to create the calibration curve.
Domain and range restrictions must be observed.
Explanation:
Calibration curves are tools necessary in understanding the instrumental response for any analyte.
A calibration curve is obtained by preparing a set of standard solutions with known concentrations of the analyte. The instrument response for each concentration is measured and plotted against the concentration of the standard solution. The linear portion of this plot may be used to determine the unknown concentration of a sample of the analyte.
The equation of the best-fit line is used to determine the concentration of the unknown sample.
Which of the following destroys the marine ecosystem?
A. fishpond C. dynamite fishing
B. reclamation D. constructing man-made sanctuaries
Answer:
The correct one is dynamite fishing
Read: https://kids.britannica.com/kids/article/DNA/390730 (Links to an external site.)
Answer the following questions:
1. What sort of things does DNA determine for a creature? (Think physical traits)
2. Sometimes there are mistakes in DNA, what are these mistakes called? what sort of things can these mistakes cause?
3. What makes up the sides of the DNA structure?
4. There are four different bases in DNA: adenine, thymine, guanine, and cytosine. About how many total pairs do humans have in their DNA?
Answer:
im not doing your whole homework. but ill give you one cent ;>, whats ur paypal
Explanation:
Suppose you perform a calorimeter experiment to determine the molar heat of neutralization of an unknown acid, H A HA, with sodium hydroxide, N a O H NaOH. You mix 37.2 mL of 0.50 M H A HA with 56.8 mL of 0.75 M N a O H NaOH and calculate the heat of reaction as -1.6 kJ. What is the molar heat of neutralization (in kJ/mol) for the unknown acid
Answer:
-86.02 kJ/ mole
Explanation:
The moles of the acid used = Molarity × Volume (L) =
= 0.50 (0.0372 L)
= 0.0186 moles
The heat released = -1.6 kJ
∴ 0.0186 moles neutralization of HA heat is: -1.6 kJ
The molar heat of neutralization due to one mole of the unknown acid = -1.6/0.0186
= -86.02 kJ/ mole
The molar heat of neutralization for the unknown acid is -86.02 kJ/ mole.
How to calculate Moles?The moles of the acid used = Molarity × Volume (L) =
= 0.50 (0.0372 L)
= 0.0186 moles
Thus, the moles of the acid used is 0.0186.
The heat released = -1.6 kJ
Thus, 0.0186 moles neutralization of HA heat is: -1.6 kJ
Molar heat of Neutralization: It is the amount of heat each mole of base added to the acid (or vice versa) causes the reaction to give off.
The molar heat of neutralization due to one mole of the unknown acid = [tex]\frac{-1.6}{0.0186}=-86.02kJ/mole[/tex]
So, the molar heat of neutralization is -86.02kJ/mole.
Find more information about Moles here:
brainly.com/question/13314627
A chemistry student is given 700. mL of a clear aqueous solution at 26.° C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 26.° C. The solution remains clear. He then evaporates all of the water under vacuum. A precipitate remains. The student washes, dries and weighs the precipitate. It weighs 0.032 kg.
Required:
Using only the information above, can you calculate the solubility of X in water at 22.0°C ? If you said yes, calculate it. Be sure your answer has a unit symbol and 2 significant digits.
Answer:
The correct answer is - yes, 4.57 g of solute per 100 ml of solution
Explanation:
The correct answer is yes we can calculate the solubility of X in the water at 22.0°C. The salt will remain after the evaporate from the dissolved and cooled down at 26°C.
Then, the amount of solute dissolved in the 700 ml solution at 26°C is the weighed precipitate: 0.032 kg = 32 g.
Then solublity will be :
32. g solute / 700 ml solution = y / 100 ml solution
⇒ y = 32. g solute × 100 ml solution / 700 ml solution = 4.57 g.
Thus, the answer is 4.57 g of solute per 100 ml of solution.
How many atoms are in phosgene
Answer:
3 atoms
Explanation:
there is one calcium and two chlorine
When a baseball bat hits a baseball, what happens to the energy?
completo ancur
Answer: the baseball bat transfor its energy in the ball.
Explanation: you hit it with one and find out and tell me what you think what happen.
What is the scientific name of hydrogen -2 and hydrogen -3.
Answer:
Hydrogen 2 is called deuterium, Hydrogen 3 is called Tritium
Explanation:
Hydrogen is the only element whose isotopes have different names in common use today: the 2H (or hydrogen-2) isotope is deuterium and the 3H (or hydrogen-3) isotope is tritium.
I need help answering number 14 A B and C. Thank you!
Answer:
Explanation:
TiO2 + C + 2 CI2 → TiCI4 + CO2
(a)
(2.16 mol TiO2) x (2 mol CI2 / 1 mol TiO2) x ( 70.9064 g C/mol) = 306 g CI2
(b)
(2.16 mol TIO2) x (1 mol C / 1 mol TiO2) x ( 12.01078 g C/mol)n= 25.9 g C
(c)
Use the law of conservation of mass:
(2.16 mol TiO2) x ( 79.8660 g TiO2/mol) + (306 g CI2 + 25.9 g C = 504 g total.
Hope this help!:)
Judy's brand new Lamborghini car travels 280 km in 4 hours. What is its average speed?
2H2(g)+O2(g)→2H2O(l)
What is the mass of water, H2O(l) , produced when 5.70 g of O2(g) reacts with excess H2(g)?
Answer:
6.4g
Explanation:
32g of O2 produce 36g of H2O/5.70g of O2 produce x the answer is 6.4g
By definition, a(n) _______acid is any species that can donate a proton. Ammonia has a proton bonded to nitrogen, so ammonia can be an base (although a very weak one). A(n)___________ base is a proton acceptor, that is, it must have a pair of electrons to share with a proton. In theory, any atom with an unshared electron pair can be a________ pair so ammonia is a_______ proton; instead, it acts as a base and pulls a proton from water to a small extent. base The nitrogen in ammonia has an unshared electron In water, ammonia is too weak an ______-to give up its
Answer:
A Brønsted-Lowry acid.
A Brønsted-Lowry base.
Ammonia is an acceptor of proton.
Explanation:
A Brønsted-Lowry acid is any atom that can donate a proton (H +) to another atom or molecule whereas Brønsted-Lowry base is any species that can accept a proton from another atom or molecule or in other words, a Brønsted-Lowry acid is a proton donor, while on the other hand, a Brønsted-Lowry base is a proton acceptor. The ammonia molecule accepts the hydrogen ion is considered as the Brønsted-Lowry base.
