A 334-mL cylinder for use in chemistry lectures contains 5.225 g of helium at 23 C. How many grams of helium must be releasedto reduce the pressure to 75 atm assuming ideal gas behavior?

  1. 👍
  2. 👎
  3. 👁
  1. find grams at 75
    PV=nRT solve for n, then convert to grams.

    1. 👍
    2. 👎
  2. He is 4 grams/mol
    so we have 5.225/4 = 1.31 mols in 0.334 Liter at 273 + 23 = 296 K

    P V = n R T

    R = 0.082 L atm deg K / mol
    V = 0.334 L
    n = 1.31 mol
    T = 296

    P = 1.31 * 0.082 * 296 / 0.334
    = 95.2 atm
    new P = 75
    T R V the same
    so P is proportional to n
    75/95.2 = new n/ 1.31
    new n = 1.03 mols
    1.03 * 4 g/mol = 4.13 grams remain
    5.225 - 4.13 = 1.1 grams released

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    A helium balloon contains 0.50 g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

  2. Chemistry

    A helium balloon contains 0.54g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

  3. Chemistry 140A

    A gas cylinder containing 6.38 mol of neon has a pressure of 491 mm Hg at 295 K. If 3.22 mol of helium is added to this cylinder, at constant temperature and volume, what will be the pressure in the cylinder?

  4. CHEM

    A cylinder with a movable piston contains 2.00g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added

  1. physics

    Suppose that a party balloon is spherical, has a radius of 16 centimetres and is filled with helium. Furthermore suppose that we do our experiment under standard atmospheric conditions, when the air density is \(\rho = 1.225

  2. Math

    Suppose Cylinder A has the same height but twice the radius of Cylinder B. What is the ratio of the volume of Cylinder B to Cylinder A?

  3. physics

    A small cylinder rests on a circular turntable that is rotating clockwise at a constant speed. The cylinder is at a distance of r = 12 cm from the center of the turntable. The coefficient of static friction between the bottom of

  4. chemistry

    A balloon contains 40.0 L of helium gas at 106.2 kPa. What is the volume of the helium when the balloon rises to an altitude where the pressure is only 35.0 kPa? (Assume that the temperature remains constant.) Please show work! I

  1. Math

    I am stuck on several probability questions. A spinner that has 15 equal sized sections numbered 1 to 15 is spun twice. What is the probability the spinner lands on an odd number and then on an even number? A. 56/225 B. 169/225 C.

  2. Chemistry

    A helium ballon contains 0.32g of helium. Given the molecular weight of helium is 4. How many moles of helium does it contain.

  3. Chemistry

    Why is an alpha particle written as a helium (He) nucleus? A. An alpha particle has two protons and two neutrons; it is essentially the nucleus of a helium atom. B. Helium is a common element that is often present in small forms;

  4. Chemistry

    Adding helium to a balloon increased its volume from 360.9 mL to 3.532 L. If the final number of moles of helium in the balloon is 22.3 mol, what was the initial number of moles of helium in the balloon? Assume the balloon

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