1 mole of He gas is present in a container of 12 L at 300 K. If a piece of Pt metal having mass 100 g is added in the container at 300 K and pressure of gas becomes 1 atm, the mass of He (approx.) adsorbed per gram of Pt is (Assume volume of Pt piece is negligible and gas is ideal) [Take R = 0.08 atm L/mol K]
Answers
LEARNING OBJECTIVES
Apply the ideal gas law to solve problems in chemistry
KEY TAKEAWAYS
Key Points
An ideal gas exhibits no attractive forces between particles.
In the ideal gas equation, both pressure and volume are directly proportional to temperature.
Key Terms
ideal gas constant: R = 8.3145 J·mol-1·K-1
ideal gas: a gas whose particles exhibit no attractive interactions whatsoever; at high temperatures and low pressures, gases behave close to ideally
kinetic energy: the energy possessed by an object because of its motion; in Kinetic Gas Theory, the kinetic energy of gas particles is dependent upon temperature only
Kinetic Theory and Ideal Gases
All gases are modeled on the assumptions put forth by the Kinetic Theory of Matter, which assumes that all matter is made up of particles (i.e. atoms or molecules); there are spaces between these particles, and attractive forces become stronger as the particles converge. Particles are in constant, random motion, and they collide with one another and the walls of the container in which they are enclosed. Each particle has an inherent kinetic energy that is dependent upon temperature only.
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R
T
The four variables represent four different properties of a gas:
Pressure (P), often measured in atmospheres (atm), kilopascals (kPa), or millimeters mercury/torr (mm Hg, torr)