a) Room temperature is generally considered to be about 25 oC.The melting point of naphthalene is higher than room temperature. Why, then, is this type of petroleum diesel a liquid at room...

a)  Room temperature is generally considered to be about 25 oC.The melting point of naphthalene is higher than room temperature. Why, then, is this type of petroleum diesel a liquid at room temperature?

b)  Trans-decalin is a fused bicyclic molecule. Although its molecular weight (C12H18; m. w. = 138.25 g/mol) is larger than the molecular weight of naphthalene, its melting point is much lower. Explain briefly.

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