When determining specific volume v; v=RT/P R is either the gas constant .287 m2

Question

When determining specific volume v; v=RT/P

R is either the gas constant .287 m2 kg s-2 K-1 mol-1 or R(bar) 8.314 kj/kmol * K divided by molar mass of the ideal gas.

My text doesn't use the gas constant R directly (inside the front cover), so should I assume that I'll be required to find the molar mass of all substances in an open system?

This could be tricky. For example finding the molar mass for jet fuel, in a problem I'm working on outside the text, where the fluids among the inlets are considered ideal, air and jet fuel, with exhaust at the outlet. I could look up air, but jet fuel is less direct.

Are my assumptions accurate?

Explanation / Answer

yes your assumptions are correct..

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