Calculate Volumic Flow Rate for Air (kg/s) at 1 bar, 20 - 50°C

[Erdo]

Hey guys,
can some of ou help me with this question:
I need to calculate the volumic flow rate for air by using the ideal gas law. Things i know from the assignment:

molarmass = 28,96 kg/kmol
Pressure = 1 bar
mass flow = 2 kg/s
t in = 20 degrees celcius
t out = 50 degrees celcius
(sorry for bad english, from denmark)

 

[SteamKing]

PF asks that you post homework and other assignment questions to one of the HW forums.

 

[Chestermiller]

From the ideal gas law, what is the density of the air at 20C? what is the density of the air at 50C?

Chet

 

[Erdo]

From the ideal gas law, what is the density of the air at 20C? what is the density of the air at 50C?

Chet

well jeg think it's 1000 kg/m^3, because nothing else is given.

 

[SteamKing]

well jeg think it's 1000 kg/m^3, because nothing else is given.

That's some pretty dense air. A cubic meter of a-i-r has a mass of 1000 kg? Are you sure?

 

[Chestermiller]

well jeg think it's 1000 kg/m^3, because nothing else is given.

That's the density of water, not air. You need to use the ideal gas law to get the density of air under the process conditions.

Chet