CaseAnswer:
-Mole of stearic acid used = 1.3*10^-3 mol
-Molecules of stearic acid there would be in 1 mole of stearic acid = 7.994*10^20 molecules
Explanation:
Know information from the problem are:
Mass concentration of C18H32O2 = 1.6x10^-4 g/ml, Molar mass of C18H32O2 = 284 g/mol.
Unit factor from drops to ml is 72 drops = 1ml. Therefore, for every drop, n, given, there would be n drops (1ml/ 72drops). The problem tells that stearic acid was added to hexane and that the addition process was done three-time with different amounts of drops. Think of this as releasing a substance from a burette during titration. If we convert the drops into millimeters, we would have 20 drops (1ml/72drops)= 0.28 ml, 21 drops (1ml/72drops)= 0.29 ml, and 16 drops (1ml/72drops)= 0.22 ml. [We need these volumes to determine the mass of stearic acid from mass concentration given.]
Unknown informations are:
V (volume in ml) =?
The mole of stearic acid used =?
Strategy
To calculate the mole of stearic acid used, we need the mass of stearic acid from the mass concentration. To get this we need a volume. Notice that those volumes (drops) are not the same ( it is safe to say that there is an error in the readings, as they were done independently). Therefore, we would find two or three values whose difference is smaller ( there is a little error). Subtract the smaller number from the larger number till you get a smaller difference ( do this for all three values).
The set of numbers with the smallest difference is 0.29 - 0.28=0.014, our concordant value.
Solutions
Now we us this set of numbers, 0.29-0.28, to determine an average volume :
V = (0.29-0.28)/2 (ml)
V= 0.285 ml
Now we can calculate the mass of stearic acid from the mass concentration:
m = C*V; m is the mass, C is the concentration in g/ ml, and V is the volume in ml.
m = (1.64*10^-4 g/ml)*(0.285 ml)
m = 4.674*10^-5 g
The mole of stearic acid used:
n = m/MM l; n is the mole of stearic acid, m is the mass of stearic acid, and MM is the molar mass of stearic acid.
n = 4.674*10^-5 g (284 g/mol)
n = 1.3274*10^-3
How many molecules of stearic acid would there be if it was 1 mol of stearic acid?
1 mol = 6.02214*10^23 molecule
Therefore, a conversion fraction would be:
6.02214*10^23 molecule/ 1 mol
Solution
Molecules of stearic acid in 1 mol =
1.3274*10^-3 mol (6.02214*10^23 molecule/ 1 mol)
= 7.994*10^20 molecules in 1 mol of C18H16O2
Neutral atoms of neon with atomic
number 10 have the same number of
electrons as
a o²+
b ca²+
c
Answer:
d. Mg²⁺
Explanation:
c. K⁺
d. Mg²⁺
Based on the Bohr's atomic model, the atom has electrons (Mass 0; Charge -1), protons (Mass 1; Charge +1) and neutrons (Mass 1; Charge 0).
The atomic number is equal to the number of protons. That means there are 10 protons. As the Neon is netural, the amount of electrons must be 10.
A neutral atom of Mg has 12 electrons, that means the Mg²⁺ has 10 electrons the same than Ne.
Right option is:
d. Mg²⁺Fusion:
Requires high temperatures
Occurs in the sun and other stars
Creates less radioactive waste than fission
All of the above
Using an analogy of a water balloon, describe the function of the bladder.
Answer:
A bladder is like a balloon, because it holds urine, just like a balloon holds air. The urethra's function is to excrete urine from the human body.
Explanation:
A bladder and a balloon are similar, because it is the bladder which clasp urine, whereas a balloon clench air. The role of urethra is to eliminate urine from our human body.
What is bladder?The hollow organ which is in triangle shape and found in the lower abdomen just like a balloon is defined as the bladder. The urinary bladder is also known as a temporary reservoir of urine. Urine is reserved in the urinary bladder till it is removed out through the urethra.
As a result of the contraction of the wall of the urinary bladder, urine is eliminated from the body from time to time. The urine contains waste and extra fluid left over the body which has to be eliminated.
The bladder resembles the water balloon in that it holds urine in the similar way as the water balloon clench water. The water balloon pops when the amount of water exceeds than it can hold.
Thus the function of bladder and water balloon are found to be same.
To know more about bladder, visit;
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Using this illustration, what is the chemical formula? Picture and possible answers are below.
The answer is It is NH3.....
How many grams of carbon are found in
3.50 atoms of carbon?
Answer:
140
Explanation:
there is 140 grams in 3.5 atoms of carbon
Please help me find the answer, thank you.
Answer:
Chlorine hope i helped.
Explanation:
What is the mass of 8.23 x 10^23 atoms of Ag
Answer:
[tex]\boxed {\boxed {\sf Approximately \ 147 \ g\ Ag}}[/tex]
Explanation:
Convert Atoms to Moles
The first step is to convert atoms to moles. 1 mole of every substance has the same number of particles: 6.022 ×10²³ or Avogadro's Number. The type of particle can be different, in this case it is atoms of silver. Let's create a ratio using this information.
[tex]\frac{6.022*10^{23} \ atoms \ Ag}{1 \ mol \ Ag}[/tex]
We are trying to find the mass of 8.23 ×10²³ silver atoms, so we multiply by that number.
[tex]8.23 *10^{23} \ atoms \ Ag *\frac{6.022*10^{23} \ atoms \ Ag}{1 \ mol \ Ag}[/tex]
Flip the ratio so the atoms of silver cancel. The ratio is equivalent, but places the other value with units "atoms Ag" in the denominator.
[tex]8.23 *10^{23} \ atoms \ Ag *\frac{1 \ mol \ Ag}{6.022*10^{23} \ atoms \ Ag}[/tex]
[tex]8.23 *10^{23} *\frac{1 \ mol \ Ag}{6.022*10^{23} }[/tex]
Condense into one fraction.
[tex]\frac{8.23 *10^{23} }{6.022*10^{23} } \ mol \ Ag[/tex]
[tex]1.366655596 \ mol \ Ag[/tex]
Convert Moles to Grams
The next step is to convert the moles to grams. This uses the molar mass, which is equivalent to the atomic mass on the Periodic Table, but the units are grams per mole.
Ag: 107.868 g/molLet's make another ratio using this information.
[tex]\frac {107.868 \ g \ Ag}{1 \ mol \ ag}[/tex]
Multiply by the number of moles we calculated.
[tex]1.366655596 \ mol \ Ag*\frac {107.868 \ g \ Ag}{1 \ mol \ ag}[/tex]
The moles of silver cancel out.
[tex]1.366655596 *\frac {107.868 \ g \ Ag}{1 }[/tex]
[tex]1.366655596 * {107.868 \ g \ Ag}[/tex]
[tex]147.4184058 \ g\ Ag[/tex]
Round
The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.
147.4184058The 4 in the tenths place tells us to leave the 7 in the ones place.
[tex]147 \ g\ Ag[/tex]
8.23 ×10²³ silver atoms are equal to approximately 147 grams.
convert 555 torr into kpa
Answer:
73.97 kPa
Explanation:
It's helpful to know the conversion factors and apply them.
First, convert from torr to atm:
555 torr ÷ 760 atm = 0.730 atm
Next, convert from atm to Pa:
0.730 atm × 101,325 Pa = 73967 Pa
Finally, convert to kPa (1000 Pa in 1 kPa):
73967 Pa ÷ 1000 kPa = 73.97 kPa
Zach invited his friend Sydney to a pool party over the weekend. Sydney informed Zach that the climate was supposed to be rainy over the weekend and suggested that he change his plans. Zach explained to Sydney that she had misused the word “climate” and she should have used the word “weather” instead. Which of the following statements accurately clarifies the confusion between Zach and Sydney?
A). Zach is correct; the weather for this area is typically tropical and wet.
B). Sydney is correct; there has been an abundance of rainfall within the last month, changing the climate of this particular area.
C). Zach is correct; the climate of an environment is determined by patterns in weather conditions over an extended period of time.
D). Sydney is correct; the climate of an environment can change constantly based on weather, wind, and front patterns in the area.
Answer:
C
Explanation:
Common sense
the provided balanced equation applies to the reaction that takes place between lithium, hydroxide and sulfuric acid. 2LiOH + H2SO4 --> Li2SO4 + 2H2O.
If the reaction begins with 26.7 grams of lithium hydroxide (LiOH) and 164.048 grams of sulfuric acid (H2SO4), how many grams of lithium sulfate (Li2SO4) is produced? Assume 100% yield. Round your answer to the nearest tenth of a gram
Answer:
About 60 grams.
Explanation:
The on point answer is 61.28 grams.
We can predict that summer will follow spring. T or F
Answer:
T
Explanation:
What volume of solution is required to produce a 7.8M solution containing 23.6g of LiBr?
Answer:
34.9 mL
Explanation:
First we convert 23.6 g of LiBr into moles, using its molar mass (86.845 g/mol):
23.6 g ÷ 86.845 g/mol = 0.272 mol LiBrNow we can calculate the required volume, using the definition of molarity:
Molarity = moles / litersliters = moles / Molarity0.272 mol / 7.8 M = 0.0349 LWe can convert L into mL:
0.0348 L * 1000 = 34.9 mLwhich of the following subject area contains questions that can be answered by science?
Answer:
ASTRONOMY
Explanation:
im taking that test right now
i hope this helps :0
Answer:
forensics
Explanation:
took the test yay
francium phosphate
+ cesium acetate
Answer:
[tex]Fe_3PO_4+3Cs(CH_3COO)\rightarrow Cs_3PO_4+3Fr(CH_3COO)[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to illustrate the complete double displacement reaction between francium phosphate and cesium acetate as given on the question:
[tex]Fe_3PO_4+Cs(CH_3COO)\rightarrow Cs_3PO_4+Fr(CH_3COO)[/tex]
Which must the balanced due to the nonequal francium and cesium atoms:
[tex]Fe_3PO_4+3Cs(CH_3COO)\rightarrow Cs_3PO_4+3Fr(CH_3COO)[/tex]
Best regards!
Study the map. Then use the drawing tool to create a model of how the two air masses look when they interact at front 1.
Answer: Picture
Explanation: I got it right
Answer:
2 and 3 look like a cold front in front of 1.
Explanation:
3 is an occluded front which occurs when a cold air mass devours a warm air mass and then collides with another cold mass. 2 is a warm air mass, and 1 is a cold air mass.
pls show ur work will mark the brainliest
Answer:
M = 0.47
Explanation:
1 - Turn grams to moles using molar mass:
16g NaOH × 1 mol NaOH / 40g NaOH = 0.4 mol NaOH
2- Turn milliliters to liters:
855mL × 1 L / 1000mL = 0.86 L
3- Use formula which is M = moles of solute / liters of solvent:
M = 0.4 mol NaOH / 0.86 L = 0.47
TRUE OR FALSE? what is similar about the structure of all atoms is that they all have a nucleus made up of one or more protons and neutrons. Than electrons are located outside each nucleus
Answer:
the answer is true
Explanation:
PLEASE HELP NO LINKS OR FILES
You have to use the words that are in red to describe the wave.
Answer:
Rise surface fall surface rise
Explanation:
Hope this helps!
PLEASE HELO DOES ANYONE KNOW THE RIGHT ANSWER ??
Answer:
the last one because matter is the amount of space
Help a person out please
Explanation:
here I haven't drawn the diagram but I have marked them where they will be .
So if it helps don't forget to like and Mark me
Is my sister bad or good.
Answer:
decent
Explanation:
What are the types of Asexual reproduction?
need this asap bro uyftghjkddfs
Answer:
The types of Asexual reproduction include: fission, fragmentation, budding, vegetative reproduction, spore formation and agamogenesis.
Please help me out this is a test.
The imaje shows a plate baundary. Arrows have been added to indicate the movement if the plates.
PLEASE HELP QUICKLY!! How many moles of NH4OH are in 0.125L of a 1.4 M solution of NH4OH?
Answer:
0.175mol
Explanation:
Molarity of a solution can be calculated thus:
Molarity (M) = number of moles (n) / volume (V)
According to the information provided in this question, volume of NH4OH = 0.125L, molarity = 1.4M
Using; Molarity = n/V
1.4 = n/0.125
n = 0.175mol
a sample of gas X occupies 10 m^3 at a pressure of 120 kPa.if the volume of the sample is compressed to 3m^3 ,what is the new pressure of the gas?
Answer:
400 kPaExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
120 kPa = 120,000 Pa
We have
[tex]P_2 = \frac{120000 \times 10}{3} = \frac{1200000}{3} \\ = 400000[/tex]
We have the final answer as
400,000 Pa = 400 kPaHope this helps you
Which of the following is not a force
A. Weight
B. Friction
C. Acceleration
D. Air resistance
Answer:
Acceleration
Explanation:
Acceleration doesn't change one moment to the next, and therefore, doesn't count as a force.
The answer option which is not a force is: C. Acceleration.
What is a force?A force can be defined as a push or pull of an object or physical body, which typically results in a change of motion (acceleration), especially due to the interaction of the object with another.
The examples of a force.In Science, the three (3) most common examples of a force include the following:
WeightFrictionAir resistanceIn conclusion, acceleration is not an example of a force but a change in the rate of velocity of an object with respect to time.
Read more on force here: brainly.com/question/1121817
How are molecules, compounds, and substances related?
Answer:
Molecule is the general term used to describe any atoms that are connected by chemical bonds. Every combination of atoms is a molecule. A compound is a molecule made of atoms from different elements. All compounds are molecules, but not all molecules are compounds.
Explanation:
i hope you mark me the brainliest
What’s the easiest way to add energy to matter
Answer:
The easiest way is to heat matter which raises its internal energy andso the mass as well. Another possibility is to accelerate matter as in case of protons or heavy ions in the LHC, Protons ,for example , are accelerated to the energies of 6500 GeV which means increase of the rest mass by a factor of almost 7000
What is the charge of a Li ion?
A. +1
B. +2
C. -1
D.-2
Answer:
A
Explanation:
because the charge of Li ion is +1 well I don't know the explanation yet but I'm sure about the answer
Within the visible spectrum, red light has
Answer:
Within the visible spectrum, red light has the longest wavelength.
Hope that helps! :)
Explanation: