Submit which of the following best describes the reaction? 2 h2s(g) + 3 o2(g) → 2 h2o(g) + 2 so2(g) a) as has a large negative value. b) asº has a small negative value. c) as has a large positive value. d) as has a small positive value. e) as is zero.
0 and as

 B) has a small negative value.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

is positive when randomness increases and is negative when randomness decreases.

As there are 5 moles of gaseous reactants and 4 moles of gaseous products, the gaseous molecules are decreasing on moving from reactants to products, thus randomness decreases and is negative.      

Thus   has a small negative value.