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AApproximate air as a mixture of 7 8 % Nitrogen and 2 2 % oxygen ( by moles ) . Calculate the followings for air

AApproximate air as a mixture of 78% Nitrogen and 22% oxygen (by moles). Calculate
the followings for air using values you find in (A.5). Be careful about units.
(a) Specific gas constant R of air [2 Pts]
(b) Molecular mass of air [2Pts]
(c) Polytropic exponent k for isentropic processes of air [2Pts]
(d) Comment of the difference between your results and the Air values you find in (A.5). Was this question based on a reasonable approximation? [2Pts]

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