An ideal gas mixture has the following (masses) in kg: \mathrm{N}_{2}=21 \quad ; \mathrm{CO}=31 \quad ; \mathrm{CO}_{2}=10 \quad ; \mathrm{H}_{2} \mathrm{O}=12 \quad ; \mathrm{O}_{2}=24 The gas is compressed from 1

bar; 20°C to 5 bar; 255°C. \text { Find the entropy change }\left(\Delta S_{\mathrm{m}}\right) \text { in } \mathrm{kJ} / \mathrm{K} \text {. } (ii) Is the process (adiabatic reversible; adiabatic irreversible; or non adiabatic)? Explain