Benzene does not follow the trend established by the enthalpy values obtained for the other compounds in Part C. What value would be predicted for the molar enthalpy of combustion for benzene from the observed trend obtained from cyclohexane, cyclohexene, and 1,4‐cyclohexadiene?

Benzene does not follow the trend established by the enthalpy values because if the resonance effect.

Explanation:

Considering the trend in the molar enthalpy of combustion of the following chemical compounds that is cyclohexane, cyclohexene, and 1,4‐cyclohexadiene which has the following values for their molar enthalpy of combustion as -3920 kJ/mol, -3800 kJ/mol and -3570.5 kJ/mol respectively.

From the value for molar enthalpy of combustion for the three chemical Compounds above, it can be noted that as we have more bonds the molar enthalpy of combustion values decreases by at least 120 kJ/mol.

Thus, for benzene with 3 bonds we should expect a decrease of 120kJ/mol × 3 bonds = 360kJ/mol. But the value for the molar enthalpy of combustion of benzene is -3560 kJ/mol. That is a decrease of -0010kJ/mol from the value for 1,4‐cyclohexadiene.

This is because of the resonance effect in benzene.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.