How much energy is required to melt a 500. gram block of iron? the heat of vaporization is 6090 j/g and the heat of fusion is 247 j/g.

Carbons 1 and 4 of 1,3−cyclopentadiene are equivalent and give the same carbocation on protonation. likewise, carbons 2 and 3 are equivalent. write the structure of the carbocation formed by protonation of c−2 or c−3 to verify that it is not allylic and therefore not as stable as the one formed by protonation of c−1 or c−4.