How to calculate mass of air in mass balance?

  • #1
What is the general procedure for calculating the mass of air in mass balance problems?
what assumptions must be made? How do i convert this into mass from a percentage, e.g 21% oxygen & 79% nitrogen?
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
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Hello Mo, welcome to PF :smile: !

No responses so far, so let me give it a try:

(don't know if this question is for continuous flow or batch, though).

With 21 mass% of O2 and 79% of N2 any mass flow is fully described.
For the volume flow you need a density for which you use the ideal gas law in most cases (and a state equation for extreme situations).
The ideal gas law is in terms of moles, so you'll also neet he molar weights (32 and 28, respectively).

Does this help /

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