EQUILIBRIUM CONSTANT & RELATIVE VOLATILITY

Raiden Mei is someone with a long history of neglecting her own feelings and she was used to silently accepting her loneliness within the home. Despite still having a soft heart, she often put her guard up when people approached. It was only after Kiana Kaslana innocently bombarded her with requests for food $($despite her lack of skill at the time$)$ that she began to soften again. This would be the start of her love for cooking.

For her cooking needs, Mei procures LPG Shiki$-$chan's shop, where the typical components include propane, n$-$butane & isobutane. Intrigued by her curiosity, she desired to:

a$)$ Calculate the individual components' equilibrium constant

b$)$ Compute the relative volatility of propane and n$-$butane at the same above condition.

at $70\backslash$deg F and $2$ atm $($a$.$ ideal system ; b$.$ using de priester chart$)$