Chemistry

It turns out that the Van Dar Waals constant b is equal to four times the total volume actually occupied by the molecules of a mole of gas. Using this figure, calculate the fraction of the volume in a container actually occupied by Ar atoms:
a) at STP
b) at 100 atm pressure and 0 degrees Celsius

((Assume for simplicity that the ideal-gas equation still holds.))

Ar

a= 1.34
b = 0.0322

I'm extremely confused about this question, are they asking for the volume when they state fraction of the volume.

  1. 👍
  2. 👎
  3. 👁
  1. The units of b are liters/mole. So the actual molecules in a liter of Argon occupy b/4 or 0.008 liters.

    At STP, the (mostly empty) space occupied by gas is 22.4 liters.

    For the fraction, take the ratio.

    Then do the same thing for the 100 atm case. The volume occupied (including space between atoms) will be 100 times less than at 1 atm STP, or 0.224 liters.

    1. 👍
    2. 👎
  2. Therefore, they are asking for the volume

    (a) at STP

    v = 22.4 L
    T = 273 K
    P = 1 atm

    Would I use Van der Waals equation for (a) or for (b)? I think I would have to use this equation for b

    (a) V = nRT/ P

    Can I use this for question a

    1. 👍
    2. 👎
  3. Okay, then what equation can I use for (a)

    Instead of using the ideal-gas equation,
    can I use the mole-fraction

    By stating "For the fraction, take the ratio. " does this apply to the mole-fraction

    1. 👍
    2. 👎
  4. You should take the ratio of the computed volumes.

    0.008/22.4 in the first case

    It doesn't make sense to talk about the mole fraction of solid spheres

    1. 👍
    2. 👎
  5. Okay but wait we can find the number of moles using PV = nRT? Right?

    V = 22.4 L
    P = 1 atm
    R= 0.0831 L-atm
    T = 273 K

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Geometry

    Regular pentagons A and B are similar. The apothem of Pentagon A equals the radius of Pentagon B. Compare the areas. The area of Pentagon A is equal to 1.49 times the area of Pentagon B. The area of Pentagon B is equal to 1.49

  2. Chemistry

    Use the van der Waals equation of state to calculate the pressure of 3.60 mol of NH3 at 489 K in a 4.50-L vessel. Van der Waals constants can be found here. P= Use the ideal gas equation to calculate the pressure under the same

  3. SCIENCE 1

    The van der waals equation incorporates corrections to the ideal gas in order to account for the properties of real gases one of the correcctions accounts for A.attractions between molecules B.the quantum behavior of molecules

  4. Chemistry

    Molecular crystals consist of molecules held together by intermolecular forces. Ice is a good example. In ice, water molecules are held together by ______, and by London dispersion forces. Intermolecular forces are _______ than

  1. Physics

    A constant force is exerted for a short time interval on a cart that is initially at rest on an air track. This force gives the cart a certain final speed. Suppose we repeat the experiment but, instead of starting from rest, the

  2. chemistry

    The melting point of a compound is not influenced by which of the following? A. polarity B. electronegativity of its atoms C. Van der Waals forces D. hydrogen bonds E. isotope of carbon

  3. Word Problem

    Use a proportion to solve the problem. On Anne's bicycle, the ratio of pedal turns to rear-wheel turns in second gear is 4 to 7. If her rear wheel turns 994 times per mile, how many times does she turn the pedal in one mile?

  4. Math word problem

    On Anne's bicycle, the ratio of pedal turns to rear-wheel turns in second gear is 4 to 7. If her rear wheel turns 994 times per mile, how many times does she turn the pedal in one mile? Express your answer as an integer or mixed

  1. physcial science

    If a step-up transformer has a primary coil with 15 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts? A. 8 turns B. 30 turns C. 80 turns D. 160 turns

  2. physics homework! #92

    A small sphere is hung by a string from the ceiling of a van. When the van is stationary, the sphere hangs vertically. However, when the van accelerates, the sphere swings backward so that the string makes an angle of è with

  3. Finance

    Your company is considering a replacement of an old delivery van with a new one that is more efficient. The old van cost $30,000 when it was purchased 5 years ago. The old van is being depreciated using the simplified straight

  4. Chemistry

    Properties of chlorine, iodine and their compounds are compared. Property Q for chlorine is smaller than for iodine. What is property Q?A.solubility of the silver halide in NH3 (aq)B. strength of van der Waals’ forces between

You can view more similar questions or ask a new question.