Question

Cholesterol is a lipid molecule synthesized by all animal cells and is an essential structural component...

Cholesterol is a lipid molecule synthesized by all animal cells and is an essential structural component of all animal cell membranes. The molecular formula for cholesterol is C27H46O. A sample of pure cholesterol has a mass of 0.3850 grams. A) How many molecules of cholesterol are in this sample? B) How many atoms of carbon are in this sample?

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

a)
molar mass of Cholesterol = 386 g/mol
number of mole of Cholesterol = (given mass)/(molar mass)
= 0.3850/386
= (9.97*10^-4) mol
1 mole of Cholesterol has 6.02*10^23 molecule
(9.97*10^-4) mole of Cholesterol has (6.02*10^23*9.97*10^-4) molecule
number of molecule of Cholesterol = (6.02*10^23*9.97*10^-4)
= 6.0*10^20

Answer : 6.0*10^20
b)
1 molecule of Cholesterol has 27 atom C
6.0*10^20 molecule of Cholesterol has (27*6.0*10^20) atom C
number of C atom = 27*6.0*10^20
= 1.62*10^22

Answer : 1.62*10^22

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
94. The structure that confers structural strength on bacterial cells is known as the a. cytoplasmic...
94. The structure that confers structural strength on bacterial cells is known as the a. cytoplasmic membrane b. cell wall c. ribosome d. cytoplasm 95. Archaea and Bacteria are unified as prokaryotes in lacking ______________ a. membranes b. nuclei c. membrane-enclosed organelles d. nuclei and membrane-enclosed organelles 96. When a bacterial culture contains only one type of organism, it is called a ______________. a. mixed culture b. liquid culture c. environmental culture d. pure culture 97. Prokaryotes and eukaryotes a....
1. What is the difference between osmosis and diffusion? A) they are the same in all...
1. What is the difference between osmosis and diffusion? A) they are the same in all ways   B) osmosis only occurs in marine (salt water) organisms   C) diffusion only occurs in animal cells while osmosis occurs in all cells D) they are the same except osmosis specifically and only involves water 2. What is the role of cholesterol in cell membranes? A) cholesterol has no role in cell structure   B) it stabilises the membrane by adding rigidity to its structure...
Most eukaryotic cells are about 10µm in diameter, but a few cells in your body are...
Most eukaryotic cells are about 10µm in diameter, but a few cells in your body are about meter long. These are the neurons running from you spinal cord to your feet. They have a normal-sized cell body, with various bits sticking out, notably the “axon.” Neurotransmitters are small molecules synthesized in the cell body, but needed at the tip of the axon. One way to get them to their destination is just to let them di?use there. Model the axon...
Please Answer all In a single molecule of water, the hydrogen atoms and oxygen atom are...
Please Answer all In a single molecule of water, the hydrogen atoms and oxygen atom are held together by _______. A) ionic bonds B) covalent bonds C) hydrogen bonds D) none of these Linking monomers into polymers through covalent bonds is end results of ______. A) dehydration synthesis B) hydrolysis C) ionic bonding D) hydrogen bonding A bacterial cell that has flagella distributed over its entire surface is best described as ________________. A) peritrichous B) monotrichous C) lophotrichous D) amphitrichous...
The scientific method is best distinguished from earlier forms of knowledge by Accurate measurements              b. inductive...
The scientific method is best distinguished from earlier forms of knowledge by Accurate measurements              b. inductive reasoning           c. deductive reasoning d. publishing of results                 e. experimentation Which one word best describes a tentative explanation of the data? a. control        b. deduction    c. theory          d. placebo       e. hypothesis An explanation which has been widely tested, which is not found to be false, and which explains a large group of observations is called                      a. quantitative analysis           b. a theory Qualitative...
Carbon Dating: All living organisms contain two isotopes (types) of carbon; carbon-12 ( 12C) and carbon-14...
Carbon Dating: All living organisms contain two isotopes (types) of carbon; carbon-12 ( 12C) and carbon-14 (14C). Carbon-12 is stable, meaning that its atoms do not decay. Carbon-14 however, is radioactive or unstable, meaning that an atom of carbon-14 may decay. It does this by throwing off an electron and thus transforming itself into Nitrogen 14. The ratio of carbon-14 to carbon-12 is the same for all living organisims, about 1/10, 000. However, once an organisim dies the carbon-14 begins...
1.A 0.5538 g sample of a pure soluble bromide compound is dissolved in water, and all...
1.A 0.5538 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of the resulting AgBr is found to be 1.1298 g. What is the mass percentage of bromine in the original compound? % 2. A student determines the manganese(II) content of a solution by first precipitating it as manganese(II) hydroxide, and then decomposing the hydroxide to...
Question 1 .Solve all a)How many moles of nitrogen, N, are in 90.0 g of nitrous...
Question 1 .Solve all a)How many moles of nitrogen, N, are in 90.0 g of nitrous oxide, N2 c)Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 8.70 moles of magnesium perchlorate, Mg(ClO4)2. d)A sample of propane, C3H8, contains 12.9 moles of carbon atoms. How many total moles of atoms does the sample contain? e)Caffeine is a bitter stimulant drug and is found in varying quantities in seeds, leaves, and so on. Its formula is C8H10N4O2. Match...
Chloroplasts are        a. the sites of photosynthesis for eukaryotic cells b. the sites of photosynthesis for...
Chloroplasts are        a. the sites of photosynthesis for eukaryotic cells b. the sites of photosynthesis for prokaryotic cells        c. the sites of protein synthesis d. the sites of ATP synthesis in eukaryotic cells              e. (a) and (b) The nucleus of a cell              a. holds the code for protein synthesis b. is the site of ATP synthesis                  c. is the site of photosynthesis for eukaryotic cells d. is the carrier for most of the hereditary information for eukaryotic cells e....
Question 401 pts Kinetic energy is the stored energy that can be used for motion. True...
Question 401 pts Kinetic energy is the stored energy that can be used for motion. True False Flag this Question Question 411 pts When an electron is transferred from one atom to another, and the two atoms are then electrically attracted to one another, a(n) ________________ bond is formed. ionic kinetic covalent hydrogen Flag this Question Question 421 pts Changing the number of ____________ of an atom would change the chemical properties of the atom. neutrons protons electrons electron shells...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT