[LunaMD]

 
These two problems are not making any sense to me.

1. The pressure on a 3.00L sample of gas is doubled, its absolute temperature(K) is increased by 50%, what is its final volume?

I know that temp is proportional to pressure in Gay lussac's Law but i can't figure out if that is the right law to even use since it doesn't seem like it can solve for volume.

2. If the volume of a 4.00L sample of gas is doubled but its final absolute temperature(K) is then reduced to half of its original value what is the final volume of gas?  

I know that they are mentioning the absolute temperature for a reason I just dont understand the relavence. Neither problem mentions STP. Any help would be great!

[Mitch]

Can't you use pv=nRT for these questions?

[LunaMD]

that is what i pondered but i dont know anything but the volume and of course R

[Borek]

pV/T = nR = const

in other words

p₁V₁/T₁ = p₂V₂/T₂

[LunaMD]

V2=v1(t2/t1) (p1/p2) this is how i am setting it up

what is the origingal temmperature 0K?
is the pressure 1atm and 2atm?

[Yggdrasil]

You don't need to know the original temperatures and presures, just the ratios between them.  For example, you don't know what P₁ and P₂ are, but you know that P₁/P₂ is 1/2.

[LunaMD]

  Got it. v2= 3.00L(1.5/1)(1/2)=2.25L

thanks a bunch