chemistry help please!?

Question

1)derivation comparing gas density to the ideal gas law:
2)what 3 things does density of a gas depend on?
3)what gas do hot air balloons use and why?
4)diffusion is:
5)effusion is:

Thanks so much I forgot my book at school and need these answers before i can do my homework!

Answer 1

Start with the ideal gas law and all will be clear

PV=nRT, where n = moles (mass)

1. Since density is mass / volume, gas density is proportional to P/T

2. As per above, mass, pressure and temp.

3. Diffusion is how fast gases mix within one another

4. Effusion is how fast a gas will find its way through a small hole.