Question

The standard enthalpy of n-pentane, isopentane, and neopentane are -35.0 and -40.0 cal/mol, respectively. The most stable isomer of pentane in terms of energy is:

a) n-pentane
b) isopentane
c) neopentane
d) They have the same stability

Answer 1

The most stable isomer of pentane in terms of energy is n-pentane.

Step-by-step explanation:

The most stable isomer of pentane in terms of energy is n-pentane.

The standard enthalpy values of n-pentane, isopentane, and neopentane are -35.0 and -40.0 cal/mol, respectively.

The boiling points of these isomers also indicate the difference in stability, with n-pentane having the highest boiling point, isopentane having a lower boiling point, and neopentane having the lowest boiling point.

This is due to the elongated shape of n-pentane, which provides a greater surface area for contact between molecules, resulting in stronger dispersion forces and higher stability.