Changes in Density of Water Vapor Under Constant Volume and Temperature

[renlok]

Homework Statement

water vapor is heated from 403.15k to 463.15k and is kept at a constant volume of 3m^2 its initial pressure is 10^5pa what is the density change?

Homework Equations

PV = nRT, D = M/V

The Attempt at a Solution

I don't really know where to go with this i found the final pressure with $$P_2 = \frac{P_1.T_2}{T_1}$$ but I am not sure this helped i also tried with P(M/D) = nRT but as you don't know M its not very helpful. I also though about using $$\delta{M} = \frac{\delta{E}}{c^2}$$ but couldn't find E without the mass...

 

[vela]

Homework Statement

water vapor is heated from 403.15k to 463.15k and is kept at a constant volume of 3m^2 its initial pressure is 10^5pa what is the density change?

Homework Equations

PV = nRT, D = M/V

The Attempt at a Solution

I don't really know where to go with this i found the final pressure with $$P_2 = \frac{P_1.T_2}{T_1}$$ but I am not sure this helped i also tried with P(M/D) = nRT but as you don't know M its not very helpful. I also though about using $$\delta{M} = \frac{\delta{E}}{c^2}$$ but couldn't find E without the mass...

You have that the density ρ is the mass of the steam M divided by the volume V it occupies. How did M and V change when the water vapor was heated?