How to find mass given pressure and temperature

[Connor Rawls]

Homework Statement

A 3-m3 rigid vessel contains steam at 10 MPa and 500 degC. The mass of the steam is?

I know this question involves using a thermo-table, I'm just very confused on how to find mass from the given information.

Homework Equations

Maybe PV=nRT

The Attempt at a Solution

I guessed at the fact that the steam is superheated water, so from there I looked up the pressure table for exactly that. From the given 10MPa, I found that the specific volume at 500 degC is 0.032811 m^3/kg. I'm lost on how to get a mass from this. My only guess is to use a total volume, V, and divide V by the specific volume, v. [ V/v ]

 

[Connor Rawls]

I solved it. Apparently 3-m3 means a Volume of 3 m^3. From there I divided V/v = 3/0.032811 = 91 kg.