Gas Laws and Root Square Mean

An ideal gas has a density of 2.0 kgm^-3 at a pressure of 2.2 x 10⁵ Pa and a temperature of 295 K. Calculate the root-mean-square speed of the gas atoms.

• 570 ms^-1

• 110 000 ms^-1

• 373 ms^-1

• 19 ms^-1

Tags

NGSS.HS-PS3-2

The following gases are at the same pressure and volume. Which molecule will have the slowest r.m.s. speed?

• hydrogen

  Relative atomic mass = 1

• carbon dioxide

  Relative atomic mass = 44

• oxygen molecule

  Relative atomic mass = 32

• helium

  Relative atomic mass = 4

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-2

A bar of gold has a mass of 1.00 kg. Calculate the number of atoms of gold in the bar. (Relative atomic mass of gold = 0.197kg/mol)

• 3.1 × 10²⁴

• 3.06 × 10²⁴

• 5.08 × 10²³

• 3.08 × 10²²

A gas syringe contains 2.0 moles of an ideal gas of volume of 0.040 m³. An additional amount of 0.5 moles of the same gas is added to the syringe. The temperature and pressure of the gas remain the same.

What is the final volume of gas in the syringe?

• 0.010 m³

• 0.032 m³

• 0.050 m³

• 0.090 m³

The kinetic theory of matter is a model used to describe the behaviour of particles (atoms or molecules) in an ideal gas. There are a number of assumptions made in the kinetic model for an ideal gas. Which one of the following assumptions is not correct?

• The collisions of particles with each other and the container walls are perfectly inelastic.

• The electrostatic forces between particles are negligible except during collisions.

• The particles occupy negligible volume compared to the volume of the gas.

• There are a large number of particles in random motion.