Moles confuse me- why are they used?
541177
A mole is 6.23 x 10^23 of something.  That number is Avogadro's number.  So a mole of Helium atoms is 6.23 x 10^23.  The weight listed on the periodic table is also the weight of a mole of atoms of a pure element in grams.\n\nThey are used because it gives us a nice round number to work with.  Some reactions require 2 of one molecule and 3 of another for example.  Well, 2 molecules and 3 molecules are hard to work with.  So instead, we could use 2 and 3 moles of the compounds and do the reaction, without having to worry about the molecular weights as much or densities or other physical properties.  Hope that makes sense.
1076966
pardon me, but why is this in chemistry?
313942
I forget my organic chem but\n\nammonia, calcium carbonate - a base is used to neutralize an acid - a base donates electrons and an acid collects them (i think, or vs/vs) \n\nboth can be used to separate other chemicals, or remove chemicals from mixtures\n\nAcids are often used as a catalyst to start a reaction like when producing explosives - and can be very dangerous\n\ncommon ex - bleach(acid) mixied with ammonia(base) produce a poisonous gas and heat which can actually cause sever damage to lungs
1145319
Remember few basics!!!!!\n\n1. One Mole of a substance is atomic weight, molecular weight or formula weight of a substance in grames.\n\nMolecular weight of water (H2O) is 18 so 18 gram of water is one mole\n\n2. One mole of any gas at STP occupies 22.4 litre of spspace\n\n3. for converting mass into  volume follow the steps\n\nI. Divide the mass by molecular weight . You get no. of Moles\n\nII. Multiply moles with STP volume i.e. 22.4\n\nYou get the volume at STP
1097097
For grams to mole, you find the molar mass of whatever substance you're working with (add the atomic masses together--it's the number with the decimal on the periodic table), and then put the number of grams you have of the substance over the molar mass.  That gives you the number of moles in the substance.\n\nFor moles to molecules, there are exactly 6.022 x 10^23 molecules of a substance per mole.  That's Avogadro's number.  Simply multiply the number of moles times Avogadro's number and you have the number of molecules.\n\nFor moles to ideal gases, there are 22.4 liters of an ideal gas at standard temperature and pressure per mole of gas.  Multiply your number of moles by 22.4 and you'll have how many liters.
762389
I am not sure what you are asking.  However, if you want to know why it is important to use several different "knowns" or standards for comparison when doing a flame test, it is so you correctly identify the color observed in the flame and thereby correctly identify the ion(s) present.
782235
Avagardro's Number = one mole, and all of the masses on the periodic table are in grams/mole.One mole of P equals 30.97g, so d. (c is the only other logical answer, but O2 has a molar mass of 32g/mole beacuse 1 oxygen has a molar mass of 16)\n\nGet used to moles, you'll see them all throughout chemistry.
483508
I will now quote part of a song our chemistry teacher taught us by Michael Offut\n\n"A mole is a unit, or have you heard?\n Containing 6.02 times 10 to the twenty-third" \n\nor 6.02*10^23
889894
Not a good idea ... you could puncture it and cause a serious infection.  \n\nThere are 3 main issues that bring patients to the dermatologist for their moles.  One common patient concern is whether any of their moles are suspicious for or at risk of turning into cancer.  Another concern is about moles that protrude and get repeatedly irritated by activities such as shaving or rubbing on clothing.  Also, many patients have concerns about the cosmetic appearance of certain moles and may desire removal to enhance appearance.\n\n  Evaluation of moles to check for melanoma is an essential part of dermatology today.  Melanoma usually develops on previously normal skin, but on occasion may develop in a pre-existing mole.  People with many moles are at slightly greater risk of melanoma, especially if the moles are large and irregular.  Checking for melanoma is trickier when patients have many moles, the difference between normal moles and melanoma are often subtle and require an expert trained eye.  The removal of normal moles does not decrease the risk of developing melanoma.  Dermatologists are best qualified to determine which moles are suspicious enough for biopsy.  Ideal biopsy technique allows for complete information about the growth with minimized scarring.\n\n  Moles that are irritated by activities of daily living are best removed.  These moles may interfere with shaving or may rub against clothing.  The techniques used to remove these moles are the same as those used to remove moles that are cosmetically undesirable.\n\n  There are many people who have one or more moles that they see as detracting from their overall appearance.  Not all undesirable moles, however, are candidates for cosmetic mole removal.  Figuring out which moles are appropriate candidates requires careful judgment.\n\n  There are two main methods used for mole removal.  Moles can either be shaved off of the surrounding skin or excised with the underlying and surrounding skin and then stitched.  For best results, treatment should be individualized.  The shave excision method is the most frequently selected method for mole removal, as it tends to produce optimal cosmetic results for most cases.  Shave excision is also generally best for moles that are irritated by clothing or shaving.  For shave excision, the skin around and under the mole is injected with lidocaine anesthetic.  This takes away any minor pain of the procedure.  It also raises and firms the skin treatment site.  Then a small sharp scalpel blade, often lubricated with mineral oil, is used to precisely remove the raised and pigmented mole tissue while leaving a cut surface that is flush with the surrounding skin.\n\n  The shave removal technique is excellent, but, like all techniques, has limitations.  Despite every attempt to cut the mole exactly flush with the skin, minor imperfections of the cut surface may occur.  An electrosurgical apparatus is used in these instances to even out the contours of the removal.\n\n  With meticulous technique and careful patient selection, shave removal results are generally gratifying to patient and physician.  Nevertheless, permanent contour and color imperfections may occasionally result.  Contour imperfections may result if the tissue is not cut exactly even with the surrounding skin and may also rarely occur due to changes in skin contours resulting from the healing process.\n\n  During shave excision of moles, some of the melanocytes are often left below the even cut surface of the removal site.  Usually, these cells pose no cosmetic problem.  Moles may, however, regrow at the excision site shortly after removal or years later.  The mole cells below the cut surface of the removal site can also cause re-pigmentation of the removal site to a shade much darker than that of the removed mole.  This re-pigmentation side effect is particularly problematic for patients with olive skin or dark eyes and hair.  Mole regrowth and re-pigmentation occur more commonl
949455
last year, i used some mole/wart remover to remove 3 moles on my face. I'm so sorry, i forgot the name, but it's all natural and you can search on google. It works like this, you have to scratch the mole with something they provide you, then you have to apply this formula all around the mole[stings slightly], just leave it. A white scab forms around the mole. Don't meddle with it. It falls off with the mole within a week. you micht have a scar, but use some aloe vera gel on it and it goes away in a month or so. I have no scar now and the mole never returned. Wait a minute, if i;m right, it's called some wart/mole vanish or something, Will get back if i remember correctly.
677175
Some time ago I had one of these moles removed.  The method of removal was similar to that used in Wart removal using cotton buds and liquid nitrogen to freeze it off.  I know of a wart product called Wartner which may be of use.  I warn you though, it hurts and really should be done by a doctor!
1085182
Moles have a living area in their tunnels, including a storage area for extra food(worms with their heads bitten off), and a latrine area.\nMoles are VERY terratorial, and a single yard will usually only have one, but 2 tunnel systems may overlap on a property, sometimes.  If a mole is killed, and the population in the area is high, another mole will move into the tunnels.\nMoles tunnel around looking for food, such as grubs, or periodical cicada.  To get rid of the moles, treat for grubs.  It it's a 17 year locust emergence, get used to the moles...at least for a few years.\nThey produce 3-5 young in the spring.\nHere is a link to information
972074
You can buy mole traps at a hardware store.\n\nJust kidding...you can cut them off but they may very well grow back....it they are bugging you enough, bite the bullet and go to the doctor.  BTW- it is good to get moles checked out once in a while by a doc anyhow.
280613
A mole is an agent in the enemies camp. a spy that is spying basically.\nMore accuratly, it is often used to refer to a person that is deeply embedded inside an organisation, thus having access to the information in the inner workings deep in the organisation.\nThus... they have dug into the top part and are a mole...
895568
a mole is 6.022×10^23 particles.\n(1.45 * (10^24)) / (6.02200 * (10^23)) = 2.41 moles\n\nN = 14 atomic mass\nO = 16\n\n(14 * 2) + (16 * 5) = 108 g/mole\n(2.41 mole) * 108 (g / mole) = 260.28 grams
1144950
Hey there nosy mole...When you find out how ...please let me know.I also am looking for someone.
498666
Aaaaaaaaalright... Formulas depend on what you're solving for but since they all involve using the ratio of moles it shouldn't be too different from equation to equation.\n\nLet's go over the mole first to help you better understand what's going on in stoichiometry.  The mole is the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12.\n\nWHOA there... hold on for a second.  The mole is simply a counting unit, just like a dozen is.  We don't usually buy 12 or 24 doughnuts; we order half dozen, one dozen, or two dozen.  Similarly, a chemist may want 1 mol of carbon, or 2 mol of iron, or 2.567 mol of calcium.  \n\nThe number of particles in a mole is known as Avogadro's number, named after an Italian chemist Avogadro. (Go figure)\n\nAvogadro's number is 6.022 x 10^23... which is the number of particles in exactly one mole of a pure substance.  One mol of a substance is going to equal its AMU on the periodic table, or, the mass. \n\nFor example, one mol of Helium is 4g.  If you wanted to find out how many grams are in 3 mols of Helium, you would do a conversion like this:\n\n3 mols He x 4g He/1 mol He\n\nIn words that would be... 3 mols of Helium multiplied by however many grams per mol Helium is, which is 4 grams per mole.  The mols would cancel out leaving us with the units in grams.  Do 3x4 and you get 12 grams of Helium in 3 mols of it.\n\nIf you want to find out how many mols of something you have you would take the amount of grams you have of it and set up another conversion like this:\n\nAmount of g x 1 mol/gram in that mol\n\nFor example, if you have 20 grams of Helium and you want to find out how many mols of it you have, the equation would look like this:\n\n20g Helium x 1 mol/4g He per mol\n\nThe grams would cancel out, leaving the answer in mols.  You would then take 20 divided by 4 and get 5 mols of Helium.\n\n(Hoping this is making sense)\n\nNow stoichiometry is just pretty much comparisons of stuff. (Mols)\n\nAlright, when you're asked to calculate the amount in moles of one substance that will react with or be produced from the given amont in moles of another substance, you must use this simple mole conversion problem.\n\namount of given substance (mols) ----> amount of unknown substance (mols)\n\nIn order to solve this type of equation, use this conversion factor.\n\ngiven quantity x mole ratio = unknown quantity\n\n\nLet's try an example now.\n\nCOsub2 + 2LiOH ---> Lisub2COsub3\nsub=subscript\n\nLet's calculate how many moles of Lithium Hydroxide are required to react with 20 mol of COsub2\n\nGiven information = amount of COsub2 = 20 mols\nUnknown = amount of LiOH in moles\n\nSince the equation is balanced, we need to use the ratio that would give us LiOH in the final answer, therefore, meaning LiOH must be on the top of the ratio.\n\nThe correct ratio would be (mols LiOH/mols COsub2)\n\nIn order to calculate this, set up the equation now. (given q x ratio = unknown)\n\nmols COsub2 x (mols LiOH/mols COsub2) = mols LiOH \n\nsince the mols of COsub2 are on the bottom, it cancels out with the mols of COsub2 on the other side of the multiplication side because that's the rule in math, therefore leaving you with the units of LiOH.\n\nsubstitute the values into the equation and calculate the answer.\n\n20 mols COsub2 x (2mols LiOH/1 mol COsub2) = 40 mol LiOH\n\nsince the mols of COsub2 cancel out, you're left with 20 x 2 mols LIOH which equals 40 mols of LiOH.\n\nThe ratio of LiOH/COsub2, 2:1, was made from the balanced equation because for every mol of COsub2 you have you need 2 mols of LiOH to react with it to produce the right amount of products.\n\nHope this helped, good luck.