Dear ChE 212 students,

I received a good question about the final problem on the homework due Thursday. The question first listed the many steps done in the problem, ending in

(last step) I calculated a value of #### moles of air.

From here I am unsure of what to do with this number. It needs to be in SCMH, which means that I need to get a volume from the number of moles of air...

The question is asking for the volumetric flow rate standard cubic meters per hour. This means the volume flow rate that _would_ occur _if_ the conditions were STP (0 C, 1 atm). This is a common form of the volume flow rate when using the ideal gas law. See page 194.

Note that the gas flowing at (some number) of standard m^3 / hr can actually be flowing at any temperature and pressure. The "standard m^3" part means that the volume is calculated using STP conditions.

Prof. Greenfield

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