Answer:
a) The molecular formula of oleic acid is: [tex]C_{18}H_{34}O_{2}[/tex]
b) There are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.
Explanation:
a)
First, let's determine the empirical formula of oleic acid from the percentage composition provided by the question:
- Assuming a 100g sample of oleic acid, the correspondent mass of C, H and O would be:
mass of C = 76.54g
mass of H = 12.13g
mass of O = 11.33g
- We must determine the number of moles contained in each of the masses determined above. For that, let's use the atomic masses of C (12.01 u), H (1.007 u) and O (15.99 u) and the following equation:
[tex]number of moles = \frac{mass of sample}{molar mass}[/tex]
number of moles of C = 76.54g / 12.01 g/mol = 6.373 mol C
number of moles of H = 12.13g / 1.007 g/mol = 12.04 mol H
number of moles of O = 11.33g / 15.99 g/mol = 0.7086 mol O
- Next, we'll try to find whole-number ratios by dividing each number of moles obtained by the smallest value obtained (0.7086):
C = 6.373 / 0.7086 = 8.994 ≅ 9
H = 12.04 / 0.7086 = 16.99 ≅ 17
O = 0.7086 / 0.7086 = 1.000
- Now, we can write the empirical formula of oleic acid as: [tex]C_{9}H_{17}O[/tex]
Now that we have the empirical formula for oleic acid (C9H17O), let's check its molar mass and compare it to the experimental value provided by the question (282 g/mol):
molar mass (C9H17O) = 9 * 12.01 + 17 * 1.007 + 1 * 15.99 = 141.9 g/mol
Note that the molar mass obtained from the empirical formula (141.9 g/mol) and the experimental molar mass (282 g/mol) are different, thus we need to find an integer multiple to determine the molecular formula (keep in mind that molecular formulas always present kind and number of atoms of each element present in the molecular compound, while the empirical formula presents the smallest coefficients for each atom).
Molecular formula = n × Empirical formula
This integer multiple, n, can be obtained by dividing the molar mass, MM , of the compound by the empirical formula mass, EFM (the molar mass represented by the empirical formula):
n = MM / EFM
n = 282 / 141.9
n = 1.987 ≅ 2
Since the integer multiple is 2, we can multiply all coefficients in the empirical formula by 2 to find the molecular formula of oleic acid:
C9 H17 O x 2 = C18 H34 O2
Therefore, the molecular formula of oleic acid is: [tex]C_{18}H_{34}O_{2}[/tex]
b)
We need to calculate the amount of molecules of oleic acid in a 3.00mL sample, considering the density as 0.895 g/mL.
From the density provided, we can calculate the mass, in grams, of oleic acid contained in 3.00 mL of this compound:
1 mL ----------------------- 0.895 g oleic acid
3.00 mL ----------------- x
Solving for x, we have that there are 2.69 g of oleic acid in a 3.00 mL sample.
Next, considering the molar mass of oleic acid (282 g/mol), we can calculate the number of moles contained in 2.685g of the acid:
282 g -------------------- 1 mol oleic acid
2.69 g ----------------- y
Solving for y, we have that there are 0.00953 moles of oleic acid in a 3.00 mL sample.
Now, using the Avogadro's number (6.022 x 10^23 particles/mol), we can calculate the amount of molecules of oleic acid in the sample:
1 mol oleic acid ------------------------------- 6.022 x 10^23 molecules oleic acid
0.00953 mol oleic acid ------------------- z
Solving for z, we have that there are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.
Determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1.76 × 103 kJ/mol. A. 113 nm B. 885 nm C. 68.0 nm D. 147 nm E. 387 nm
Answer:
The wavelength of light is 68 nm.
Explanation:
Given data:
Binding energy of electron = 176 × 10³ Kj/ mol or (1.76× 10⁶ j/mol)
Wavelength of light require to remove the electron = ?
Which types of particles are involved in a fission reaction?
A neutral neutron strikes a large neutral nucleus.
A positive proton strikes a large positive nucleus.
A neutral neutron strikes a large positive nucleus.
A positive proton strikes a large neutral nucleus.
Help, will mark brainiest if the answer is correct(explanation is preferred but not needed).
Answer:
See graph below
Explanation:
For this graph of acid-base (strong) the equivalence is just ph = 7
Question 4 of 15
The types of radiation produced by alpha, beta, and gamma decay differ in
many ways. Which characteristic do they all have in common?
A. The ability to treat cancer
B. The ability to cause cancer
C. The ability to trace the movement of chemicals
D. The ability to damage human tissue
Answer:
D. The ability to damage human tissue
please give me brainliest.
What is the molarity of a solution made by adding 1.565 moles of
PbNO3 to 0.500 L?
300. M
31.3 M
3.13 M
1.56 M
Answer:
3.13M
Explanation:
Using the Molaitry equation ( M = n/v ) just plug numbers in and solve.
When the Northern Hemisphere is tilted ________the Sun, the sunlight is _________ direct than it is in the Southern Hemisphere. (Select all that apply.)
Group of answer choices
away from; more
toward; less
toward; more
away from; less
Answer:
away from, less
Explanation:
sun is further away from the northern hemisphere so receives less light
Which mixture would be easiest to separate based on the size of the particles?
A.
oil and water
B.
vinegar and water
C.
sand and gravel
D.
sugar and water
Answer:
i believe sand and gravel because you can sift the sand
Explanation:
What is the electrical conductivity of Copper and Glass?
Please help
Answer:
Table of Resistivity and Conductivity at 20°C
Material ρ (Ω•m) at 20 °C Resistivity σ (S/m) at 20 °C Conductivity
Deionized water 1.8×105 5.5×10−6
Glass 10×1010 to 10×1014 10−11 to 10−15
Explanation:
Table of Resistivity and Conductivity at 20°C
Material ρ (Ω•m) at 20 °C Resistivity σ (S/m) at 20 °C Conductivity
Deionized water 1.8×105 5.5×10−6
Glass 10×1010 to 10×1014 10−11 to 10−15
If the actual yield for a substance is 39.487g but the theoretical yield is 38.000g, what is
the percent yield?
a. 2%
b. 96%
c. 50%
d. 104%
Answer:
b. 96%
Explanation:
a pharmaceutical company wants to extract an ingredient from pomace supplied by a certain food processing plant. which process is the most efficient with the lowest environmental impact
A. Catalyst extraction
B. High pressure, high temperature water extraction
C. Organic solvent extraction
D. Enzyme extraction
Answer: high pressure, high temperature water extraction
Explanation:
Answer:
C). high pressure, high temperature water extraction
Explanation:
Which characteristic of an outermost shell is required for an atom to not need any electrons?
1 electron
more than 2 electrons
more than 21 electrons
a full
Answer:
A full.
Explanation:
An electron needs to have a full octet do not need any more electrons. So the correct option is D.
What is a valence shell?
The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are little subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.
The majority of valence electrons are negatively charged particles, and they are all grouped in various orbitals or shells. Additionally, these electrons are in charge of how atoms interact with one another and create chemical bonds.
However, not every electron belongs to an atom. A chemical bond or molecule can only be created by the electrons that are found in the outermost shell. Valence electrons are the name given to this sort of electron.
Therefore the correct option is D.
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What is the pH of
0.000519 M NaOH?
The pH of the sodium hydroxide (NaOH) solution at the given concentration of 0.000519 M is determined as 10.72.
What is pH of solution?
The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration [H+] of the given solution.
Concentration of the basic solution, [OH⁻] = 0.000519
pOH = -log[OH⁻]
pOH = -log[0.000519]
pOH = 3.28
pH of the solutionpH + pOH = 14
pH = 14 - pOH
pH = 14 - 3.28
pH = 10.72
Thus, the pH of the sodium hydroxide (NaOH) solution at the given concentration of 0.000519 M is determined as 10.72.
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Determine the empirical formula of a compound containing 48.38 grams of carbon, 8.12 grams of hydrogen, and 53.5 grams of oxygen
As with most stoichiometry problems, it is necessary to work in moles. The ratio of the moles of each element will provide the ratio of the atoms of each element.
Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages).
Remeber that percentages are a ratio multiplied by 100. You must convert percentages back to their decimal value before working with them.
(.4838) (100 g) = 48.38 g C
(.0812 ) (100 g) = 8.12 g H
(.5350) (100 g) = 53.38 g O
Convert the mass of each element to moles of each element using the atomic masses.
(48.38 g C) (1 mol/ 12.10 g C) = 4.028 mol C
(8.12 g H) (1 mol/ 1.008 g H) = 8.056 mol H
(53.38 g O) (1 mol/ 16.00 g O) = 3.336 mol O
Find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles.
Use the mole ratio to write the empirical formula.
What is the process of photosynthesis
Answer:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar
calculate, a can of chicken broth contains 450 mg of sodium chloride in 240.0g of broth. What is the percent by mass of sodium chloride in the broth?
Answer:
The percent by mass of sodium chloride in the broth is 0.1875 %
Explanation:
Our first step is transforming the sodium chloride figure from mg to g
450mg x 1g/1000 mg= 0.45g
Now, we must calculate the percentage by using the following formula:
0.45g / 240g x 100= 0.1875%
Henceforth, we can conclude that the percentage by mass of sodium chloride in the broth is 0.1875%
The per cent by mass of sodium chloride in the broth is 0.1875 %
What is per cent by mass?The mass per cent of a component of a compound is the percentage ratio of the mass of the component by the total mass of the compound. The formula is mass per cent = (mass of component / total mass of compound) × 100.
Given data:
Mass of sodium chloride =450 mg = 0.45g
Now, we must calculate the percentage by using the following formula:
[tex]\frac{0.45gX 100}{240g }[/tex]
= 0.1875%
Hence, we can conclude that the percentage by mass of sodium chloride in the broth is 0.1875%
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how dose the air change in a hot air balloon
Answer:
The air warms up, causing it to become lighter than the cold air outside of it.
QUESTION 4
Which of the following is a weak acid?
HBr
H2SO4
HNO3
HNO2
KOH
Answer:
HNO2 I'm pretty sure is the correct answer
1) Define water gas
2) The skuLL is divided into two parts name them
• a fuel gas consisting mainly of carbon monoxide and hydrogen, made by passing steam over incandescent coke
• the cranium and the mandible.
hope it helps...!!!
Which of these activities would a Forensic toxicologist NOT preform?
a. Determine the chemical
makeup of alcohol
b. Determine if drugs played a role in an accident.
c . Determine if drugs played a role in a perpetrator actions.
d. Determine if a person died of natural causes or a poison.
Answer:
A
Explanation:
because I know it from doing a test
•••“*Pls Help Me*”•••
Answer:
C this is so ez bb
Explanation:
A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.12 C. What is the solution’s molality?
Answer:
2.19m
Explanation:
quizlet
is mixing water and glue a chemical or physical change?
Answer:
physical
Explanation:
because it would still remain as a liquid. if you were to add borax or something to it, then it would be a chemical change.
A manometer measures 450 torr of pressure in a container with 0.500-L sample of carbon dioxide, CO2. The gas is compressed to a volume of 0.100 L. What is the new pressure reading in the manometer?
Let's see
Apply boyles law
P1V1=P2V2450(0.5)=0.1P_2225=0.1P_2P_2=2250Torrcalculate the concentration of HCL
the concentration of HCI
solution:[tex]mass \: formula \: of \: hci = 1 + 35.5[/tex]
[tex] = 36.5[/tex]
[tex]mass = relative \: formula \: mass \times amount[/tex]
[tex] = 36.5 \times 0.125[/tex]
[tex] = 4.56g | {dm}^{3} [/tex]
hence, the concentration of HCI is 4.56g/dm3.
PLEASE QUICKLY HELP:)
which entry-level job would give you the best experience for a career in the lodging sector?
Choose one answer correctly!
A. Hostess
B. Réservation agent
C. Sever
D. Tour guide
Answer:
i think Hostess but id K a lodging sector is an The hospitality industry encompasses a wide range of services and activities such as lodging, restaurants, food services, and convention centers. The lodging sector consists of hotels, motels, resorts, and bed and breakfasts.
Explanation:
Give a name for a straight chain alkane with nine carbons
Answer:
n-nonane
Explanation:
please consider as brainlest if helpful
...................................................
Explanation:
I honestly don't understand why you post useless questiond
Name the following ketone:
o
CH3CCH3
Answer: the answer is A
Explanation:
just finished this on acellus
Acetone is the name of the following compound and can also be referred to as 2-propanone.
What is a ketone?ketone, any of a class of organic compounds characterized by the presence of a carbonyl group in which the carbon atom is covalently bonded to an oxygen atom.
Acetone, an organic compound, is chemically described as [tex]CH_3COCH_3[/tex], and can also be referred to as 2-propanone.
Acetone is a hydrocarbon derivative, more specifically a ketone in its simplest form because of its particular functional group.
Hence, acetone is the name of the following compound and can also be referred to as 2-propanone.
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Ammonia is a gas for which reliable analytical methods are available to determine its concentration in other gases. To measure flow in a natural-gas pipeline, pure ammonia gas is injected into the pipeline at a constant rate of 72.3 kg/min for 12 min. Five miles downstream from the injection point, the steady-state ammonia concentration is found to be 0.382 wt %. The gas upstream from the point of ammonia injection contains no measurable ammonia. How many kilograms of natural gas are flowing through the pipeline per hour?
amount of ammonia injected:
72.3 kg/min x 12 min = 867.6 kg
ammonia concentration = 0.382%
[tex]\tt 0.382\%=\dfrac{mass~amonia}{mass~ammonia+mass~natural~gas}\times 100\%\\\\0.00382=\dfrac{867.6}{867.6+mass~natural~gas}\\\\mass~natural~gas=226,252.88~kg/12min=1131264.4~kg/h[/tex]
the only solid figure that has two circular bases is a
Cylinder
Cylinder A cylinder is a solid figure with two parallel congruent circular bases.
Answer:
Cylinder
Explanation:
A cylinder is a solid figure with two parallel congruent circular bases.