What is Moles: Definition and 207 Discussions

Moles are small mammals adapted to a subterranean lifestyle (i.e., fossorial). They have cylindrical bodies, velvety fur, very small, inconspicuous ears and eyes, reduced hindlimbs, and short, powerful forelimbs with large paws adapted for digging.
The term mole is especially and most properly used for "true moles" of the family Talpidae in the order Eulipotyphla, which are found in most parts of North America, Europe and Asia, although it may also refer to unrelated mammals of Australia and southern Africa that have convergently evolved the "mole" body plan.
Moles are known pests to human activities such as agriculture, lawncare, and gardening. They do not eat plant roots, but cause damage indirectly by eating earthworms and other small invertebrates in the soil. While moles may be viewed as pests, they do provide many positive contributions to the soil, gardens, and ecosystem, including soil aeration, feeding on slugs and other small creatures that do eat plant roots, and providing prey for other wildlife.

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  1. M

    Number of moles of hydrogen gas in the cylinder

    Homework Statement A gas cylinder contains 4.00 x 10^4 cm^3 of hydrogen at a pressure of 2.50 x 10^7 Pa and a temperature of 290 K. The cylinder is to be used to fill balloons. Each balloon, when filled, contains 7.24 x 10^3 cm^3 of hydrogen at a pressure of 1.85 x 10^5 Pa and a temperature...
  2. C

    Getting moles number of Oxygen in Balloon - 65 characters

    Homework Statement A box with adiabatic and rigid walls, has a volume of 5L. The box is filled with helium and has a balloon inside filled with oxygen. Initially the helium occupies a volume of 4L, is under a pressure of 1atm and is at a temperature of 300 K. The oxygen inside the balloon...
  3. C

    Calculating Molecules in Moles of Oxygen?

    How many molecules are in 23 moles of oxygen? I don't get it, I know how to do other kinds like How many moles are there in 25 grams of water? and How many grams are in 4.5 moles of Li20? but I don't get it. THANK YOU in advance
  4. J

    Does Temperature Increase Lead to More Moles According to Avogadro's Law?

    I have the variation of the ideal gas equation: n = PV/RT Assuming that everything else is equal and only temperature rises that will mean there are more moles than before. Is that right? How can that be? Thanks for clearing it up.
  5. J

    Finding Number of Moles with Ideal Gas Equation

    I want to find the number of moles and I have the ideal gas equation as : n = PV/RT However I think I'm using the wrong units to find it, I want the answers in moles. n = (1 Pa * 1 m^3) /(8.314 JK^-1 mol^-1 * 1K) so would this give the answer x mol^-1?? I can't see how that would...
  6. A

    Discover the Length of a Box Containing 1 Mole of Sugar Cubes

    Homework Statement A typical sugar cube has an edge length of 1 cm. If you had a cubical box that contained 1 mole of sugar cubes what would its length be? I'm pretty sure I could solve this one if I had a better idea as to what a mole actually is...Thanks for the help
  7. N

    Thermodynamics- Gauge pressure, moles, molecules

    Homework Statement A 4.0 m^3 container of oxygen gas has a gauge pressure of 8x10^5 Pa at 25 degrees c. a) how many moles of oxy are present in the containe?r ANS: 1292 moles b)how many oxy molecules are present? ANS: 7.78E26 oxy (yes, i have the answers but i don't know how to get to them...
  8. S

    Chemistry How do you work out the volume and concentration when moles are given?

    Hi everyone. I was doing a past paper. I got some of the question wrong about finding out Volumes and Concentrations Could you please Help me with these Question. I have enclosed the question sheet that has all the work done on it. If you can't see image properly then use this link...
  9. P

    Converting Moles of Iron to kg: Net Charge Calculation

    Homework Statement A piece of solid Iron contains 2.5moles of atoms. Whats its mass? suppose one atom in 10^12 were missing one electron, what would be the net charge of the iron? Homework Equations The Attempt at a Solution atomic mass 192.22u so mass should be 2.5*192.22 =...
  10. S

    Chemistry How many moles of C atoms are there in 0.47 mole of Arginine

    Arginine has a molecular formula od C6H14N4O2 How many moles of C atoms are there in 0.47 mole of arginine What is the equation I would use here
  11. F

    Chemistry Finding the Moles and Concentration

    Homework Statement Hello, 1. I just have a simple question to ask and I just want to confirm my answer. The teacher gave us a solution of NaHSO3. The data given with is were 12.0g/2.0 L. When finding the mole of the solution: n=12.0g /104.06191 or is it 6.0g/104.06191 because of the two...
  12. E

    Chemistry How many moles of NH3 in the supplied solution0.2 M NH3 in 2 M Nh4NO3

    Homework Statement How many moles of NH3 are in 2ml of supplied solution: 0.2 M NH3 in 2 M Nh4NO3 Ans to be given in mmol Homework Equations Concentration = mol/ L The Attempt at a Solution Ratio of NH3 : NH4NO3 = 1: 10 2 / 11 = 0.182 ml 0.2 mol/L * 1L/ 1000ml * 0.182...
  13. G

    Chemistry How Many Moles of ATP Can Be Produced from One Mole of Glucose?

    Homework Statement assuming that all the energy released by the oxidation of one mole of glucose to carbon dioxide and water can be stored in the form of ATP, how many moles of ATP can be theoretically produced from ADP at 37 C? Use delta G since it tells you how much work a reaction could do...
  14. L

    Chemistry Converting N to Moles in Acid-Base Chemistry

    Homework Statement So I'm trying to solve a problem and it asks: If 1 ml of 10 N NaOH is added to a liter of the buffer prepared, how much will the pH change? I know how to solve the problem but one thing is really confusing me, how am I able to convert the 1 ml of 10 N NaOH into moles...like...
  15. G

    How to calculate number of moles and gas formation volume factor?

    Homework Statement I am trying to calculate the gas formation volume factor for a reservior, however I am stuck when trying to find the value n - number of moles for a gas to plug into the equation to find Bg, this is what I know; Bg (gas FVF)= volume of gas at reservoir conditions /...
  16. M

    Chemistry Moles remaining after a reaction

    Homework Statement Sulfur dioxide reacts with the oxygen in humid air to produce sulfur trioxide. After the reaction, how many moles are left of: SO2, O2 and how many moles of SO3 were created?Homework Equations 2 SO2 + O2 --> 2 SO3 The Attempt at a Solution The limiting reactant is SO2, so...
  17. P

    Chemistry How Did My Professor Calculate 45 mmoles of Limiting Reagent in a Chemistry Lab?

    Homework Statement Hi. I'm reaady to panic right now so if anyone could please take the time to answer my question I would HUGELY appreciate it! I seriously need to get this done soon as I also have a test tomorrow and i just want to cry because I'm getting nowhere... We did a lab...
  18. S

    How to Calculate the Number of Moles in a Gas Using the Ideal Gas Law?

    Homework Statement Gas is contained in an 7.71 liter vessel at a temperature of 18.6oC and a pressure of 8.35 atm. Determine the number of moles of gas in the vessel. Homework Equations 1 mol= 6.03 x 10^23 # of moles= mass of the gas/molecular mass The Attempt at a Solution I...
  19. R

    How many moles of gas are in the balloon?

    Homework Statement A spherical balloon is inflated to a diameter of 36 cm. Assuming that the gas in the balloon is of atmospheric pressure (101.3 kPa) and is at a temperature of 20°C. (a) How many moles of gas are in the balloon? (b) If 21% of the molecules in the balloon are oxygen...
  20. I

    Chemistry How Many Moles of CO Dissolve in Water According to Henry's Law?

    Homework Statement The henry's law constant (k) for carbon monoxide in water at 25 degree C is 9.71 * 10 ^-4 mol/(L*atm) How many moles of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm? Homework Equations waht pressure of carbon dioxide is required to...
  21. Wellesley

    How many moles of gas are in the bag?

    Homework Statement 1. A large closed bag of plastic contains 0.10 m3 of an unknown gas at an initial temperature of 10°C and at the same pressure as the surrounding atmosphere, 1.0 atm. You place this bag in the sun and let the gas warm up to 38°C and expand to 0.11 m3. During this process...
  22. L

    Chemistry 0.75 moles of NH3 molecules contain how many moles of hydrogen?

    Homework Statement 0.75 moles of NH3 molecules contain how many moles of hydrogen? Homework Equations The Attempt at a Solution
  23. L

    Chemistry Moles - Why do chemists use them?

    Homework Statement Could you please explain to me what moles are and how it refers to Avogadro's Constant and why chemists use them? Thanks. Homework Equations There are no equations to my knowledge.. The Attempt at a Solution I know what moles are I think but I am not sure how it...
  24. L

    Calculate the number of moles in a real gas

    Homework Statement I would like to know how to calculate how much moles of gas I have in the following in a cylinder with a certain volume and pressure. The gas in the cylinder is a mixture of air, with added oxygen and helium, the mixture is 18% Oxygen, 36,6% Nitrogen, 45% Helium and 0,4%...
  25. M

    Second derivative of Pressure with respect to moles?

    binary mixture. Na=moles of a Nb=moles of b (using Peng Robinson Equation of state) (second order partial derivative below) d^2P/(dNa^2) holding T, molar volume, Nb constant I can't figure out how to do this? I know that Peng Robinson is a function of concentration of Na and...
  26. X

    Chemistry Moles Ratio: Calculate Heat Generated by N2 & H2

    Homework Statement Given: (1/2) mol N2 + (3/2) mol H2 -> NH3 change in H = -46.11 kJ/mol If the number of moles of N2 are changed to 10 and the number of moles of H2 to 35, how much heat is generated if only 10% of the Nitrogen reacts? The Attempt at a Solution After setting...
  27. S

    Chemistry How Many Moles Are in 80.1g of Phosphorus and Atoms in 4.4 Mol F2?

    Help! Moles in Phosphorus? I have a couple problems I can't figure out. 1. How many moles of phosphorus are present in 80.1g of phosphorus? a. 0.387 mol b. 2.59 mol c. 2.48 x 10(3rd power) mol d. 15.58 x 10 (23rd power) mol e. none of these 2. How many atoms...
  28. N

    Chemistry Moles of solute particles are present in 5.07 mL of 0.688 M

    Homework Statement How many moles of solute particles are present in 5.07 mL of 0.688 M Na3PO4? Use scientific notation with 3 significant figures! Homework Equations The Attempt at a Solution 0.00507 L of soln 0.688 M M= mol solute / L of soln 0.688 = x / 0.00507 .688 *...
  29. C

    Chemistry How long should you cut a piece of wire to obtain 0.0141 moles of copper?

    I'm having problems with this question. A piece of copper wire has a diameter of 0.389mm. If copper has a density of 8.92g/cc, how long (in meters) should you cut a piece of wire to obtain 0.0141 moles of copper? I tried finding the volume of the cylinder and other things, but I'm...
  30. F

    Volume, moles, density, molar mass =>separation of molecules

    Homework Statement I am doing an exercise from my physics book right now. I am given: 1 molecule of hydrogen corresponds to 3.7x10^-26 m^3 1 molecule of led corresponds to 2.99x10^-29 m^3 the ratio of these volumes is 1.22x10^3 Q: Determine that the order of magnitude of the ratio...
  31. F

    Chemistry How Many Total Moles Are in a 1 Mol dm-3 Solution of HCl?

    How many number of moles of molecules are there in 1 mol dm-3 of HCl? Is it correct to find it this way? Number of moles of HCl = 1 mol Number of moles of H2O = 1000/18 = 55.6 mol So, total number of moles = 55.6 + 1 = 56.6 molesIf i change the question of 3 mol dm-3 of HNO3, Then the total...
  32. A

    Chemistry Moles of O in SnO2: Calculate O Moles from SnO2 Molecules

    Homework Statement If you have 4.5 x 1020 molecules of SnO2, how many moles of O do you have? The Attempt at a Solution I'm really getting the hang of moles lately but what is bothering me in this question is 4.5 x 1020 molecules of SnO2. If it was one molecule, you would have 2...
  33. A

    Calculating Moles of O in 4.5 Moles of P2O5 - Need Help!

    Trying to get my head around moles and molarity. I ran into this problem. How many moles of O are in 4.5 moles of P2O5? Having trouble figuring it out, can anyone help?
  34. D

    Chemistry 5 moles of Hydrogen Iodide dihydrate,

    If I have 5 moles of Hydrogen Iodide dihydrate, for example, what is the mass? I knw that I have to tke the number of moles times the molar mass to find the mass but what is the molar mass of the compound I suggested? Do I hve to include the extra 2H2O part when finding the molar mass? Thanks...
  35. M

    Calculating Moles of H2X and Mr of H2X in Reaction with NaOH

    (a) An acid, HX, reacts with sodium hydroxide as shown in the equation below: H2X(aq) + 2NaOH(aq) -----> 2Na+(aq) + X2-(aq) + 2H2O A solution of this acid was prepared by dissolving 1.92 g of H2X in water and making the volume up to 250 cm3 in a volumetric flask. A 25.0 cm3 sample of...
  36. W

    Chemistry How Many Moles Were Consumed in a Titration with 5.29 ml of 0.256 M Na2S2O3?

    Homework Statement The overall chemical equation for the titration reaction is: OCl(aq) + 2 S2O3(aq) + 2H+(aq) 6 Cl(aq) + S2O6(aq) + H2O(R) If a titration requires 5.29 ml 0.256 M Na2S2O3, (i) how many moles of S2O32&(aq) were consumed in the titration, and (ii) how many moles of...
  37. B

    Chemistry Conversions: How do I get the moles of HCl from the volume of 1.0 M HCl?

    Homework Statement The volume was which was 50.0mL. Homework Equations The Attempt at a Solution
  38. Z

    Chemistry Solving for Moles of Ions in 0.0200g AgNO3

    How many moles of ions are in 0.0200g AgNO3. Please help, i can't seem to set up the equation!
  39. M

    Chemistry Determining the quantity in moles of the gas that remains unreacted ?

    Homework Statement Consider the following reaction, which takes place in an autoclave at 250 degrees C and 800 atm. NH3(g) + 7/4 O2(g) --> NO2(g) + 3/2 H20(g) Into the reaction vessel has been placed 200 L of NH3(g) and 120 L of O2(g). The reaction is allowed to go to completion...
  40. C

    Chemistry What is the molarity of the HCl solution? Help Solving Dilution & Moles Problems

    I have two problems that I have trouble with. One I attempted, but I don't think I came up with the right formula. Any help would be appreciated! Problem one Use the dilution relationship (Mi x Vi = Mf x Vf) to calculate the volume of 0.500 M NaOH needed to prepare 500 mL of .250 M NaOH...
  41. M

    Chemistry How many grams of H2O are produced when 2.5 moles of O2 are used?

    Hi I need help with a Stoichiometry problem. I am complete lost. I don't know where to start, or how to to solve. 2H2 + O2 -2H2O. I know the formula balances and that is it. The questions is How many grams of H2O are produced when 2.5 moles of O2 are used? Thanks!
  42. M

    Chemistry Chemistry - Calculating moles, mass and percentages

    One area of chemistry I seem to make a lot of mistakes on is the mathematical side. Calculating moles and grams and percentages and that kinda stuff. Heres a few questions on my last test I got wrong Q1.) Copper reacts with concentrated sulfuric acid according to the equation: Cu + 2H2SO4...
  43. L

    Chemistry Finding moles from volume? diatomic

    Homework Statement I'm just going to preface this by saying I know zilch about chemistry, I'm not even sure how I passed it the last time I took it, which was in grade eleven. Is it possible for me to find moles of a gas with this information: volume: 100 m^3 of air The gas is a diatomic...
  44. D

    Calculating Moles of Gas with Ideal Gas Law

    1. How many moles of O2 gas are in 5.0L container of 4.0 atm and 288K?
  45. S

    Chemistry Atoms, Moles, Grams Conversion

    Homework Statement A microscopic scientist is assembling sugar molecules (C6H12O6) from C, H, and O atoms. If he has 6.022x10^23 atoms of each type, how many grams of sugar molecules can he assemble? Which type of atom does he run out of first? Homework Equations 1 mol = 6.02x10^23 atoms 1...
  46. X

    Error Analysis for Moles of Calcium Ions in 250mL

    Just a quick question about error analysis. Moles of Calcium ions in 10 mL = 6.0 x 10-4 ± 0.5 x 10^-5 mols I'm suppose to scale this number to Moles of Calcium ions in 250mL. So when I multiply by 25, do I multiply the error value as well? Or does it remain the same?
  47. 0

    Chemistry How do you convert Density into moles?

    Homework Statement When 10.00 mL of a solution of strong acid is mixed with 100.00 mL of a solution of weak base in a coffee-cup calorimeter, the temperature falls from 25.7oC to 20.7oC. Determine q for the acid-base reaction, assuming that the liquida have densities of 1.00 g/mL and the same...
  48. J

    Chemistry Is Molarity simply moles per liter

    Is Molarity simply "moles per liter" Is Molarity simply "moles per liter"
  49. R

    Moles & Ideal Gas: Force at 24.0 & 108 C

    Homework Statement Three moles of ideal gas are in a rigid cubical box with sides of length 0.380 m. Homework Equations What is the force that the gas exerts on each of the six sides of the box when the gas temperature is 24.0 C? What is the force when the temperature of the gas is...
  50. O

    Chemistry Finding the moles required

    ive been having a hard time with this question and any help would be appreciated. If the percent yield in the reaction of methyl iodide (CH3I) with water to form methanol (CH3OH) and HI is 50%, how many moles of methyl iodide will be required to prepare 0.1 mole of methanol? (Assume that...
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