61. (A) Diagram why ethanol (CH3CH2OH) is completely soluble in water (H2O) while propane (CH3CH2CH3) is essentially insoluble in terms of carbon-based functional groups, noncovalent bonds, entropy (AS) and enthalpy (AH). (2 pts.) (B) Instant cold packs get cold when the contents, usually solid urea and liquid water, are mixed, producing an aqueous solution of urea (H2N-CO-NH2). Although this process is clearly spontaneous (AG