Given the standard entropy values in the table, what is the value of `delta"sº"_"reaction"` for the following reaction?

2nis(s) + 3o2(g) → 2so2(g) + 2nio(s)
a. –149 j/mol·k
b. +149 j/mol·k
c. +28 j/mol·k
d. – 28 j/mol·k

Explanation:

Hello,

In this case, we define the standard change in the entropy for a chemical reaction as:

Whereas is the stoichiometric coefficient of the species i which is negative for products and positive for reactants and is the standard entropy for the species i in J/mol*K. Thus, we have:

Best regards.