Without doing any calculations, determine whether the standard entropy change, s° is positive or negative for each of the following reactions.

a. s° is positive for both reactions.
b. s° is positive for reaction 1 but negative for reaction 2.
c. s° is positive for reaction 2 but negative for reaction 1.
d. s° is negative for both reactions.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.