Solving a Take Home Quiz: Determining Gas Density

[Cheapo2004]

Heres a problem on a take home quiz I am doing, but i can't figure out how to get past the first step?!

The density of helium gas at 0°C is 0.179 kg/m^3. The temperature is then raised to 100°C, but the pressure is kept constant. Assuming that Helium is an ideal gas, calculate the new density of the gas.

Heres the equations i have:
P1V1 / T1 = P2V2 / T2

In order to work this equation i need volume, but i have a density, here's the equation i think i need:

roe = m / V
(density = mass / volume)

How do i work this if i don't have mass or volume?!

 

[Andrew Mason]

Heres a problem on a take home quiz I am doing, but i can't figure out how to get past the first step?!

The density of helium gas at 0°C is 0.179 kg/m^3. The temperature is then raised to 100°C, but the pressure is kept constant. Assuming that Helium is an ideal gas, calculate the new density of the gas.

Heres the equations i have:
P1V1 / T1 = P2V2 / T2

In order to work this equation i need volume, but i have a density, here's the equation i think i need:

roe = m / V
(density = mass / volume)

How do i work this if i don't have mass or volume?!

You have to find the proportional increase in volume: V2/V1. You know P1 and P2 (they are the same. You know T1 and T2. All you have to find is V2/V1.

AM

 

[QuantumCrash]

You know the mass of the gas doesn't change. Try putting the density formula into the equation, you will find that they cancel out.