# How to find mass given pressure and temperature

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1. Feb 13, 2017

### Connor Rawls

1. The problem statement, all variables and given/known data
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.

2. Relevant equations
Maybe PV=nRT

3. 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 ]

2. Feb 13, 2017

### 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.

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