# Mass flow rate

1. May 9, 2013

### chartlieb01

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

Work out the mass flow rate of Nitrogen travelling through a at 0.3m^3/s if the pressure is 1 bar and the temperature is 18°C and the ideal gas constant is 8314 J/Kg K

2. Relevant equations

m=ρ*V*A

m = mass flow rate
ρ= density
V = velocity
A = flow area

PV = nRT

where
P = pressure
V = volume
n = number of moles of gas
R = gas constant
T = absolute temperature

3. The attempt at a solution

I'm going round and round in a circle with it, the formula is simple enough and I know how to re-arrange it to get density but I need to work out the volume which is:

V = nRT/P

in order to do this I need to find the number of moles which is:

mass of the gas/ molecular mass

how do I work out the mass of the gas?

and how do I work out the flow area when there isn't one provided?

Thanks

2. May 9, 2013

### rock.freak667

You are given the volumetric flow rate in m^3/s which is given by:

Volumetric flow rate = velocity * flow area.

Using this, you will not need the area