NO Gas Is Converted to NO₂ Gas According to the Following

Multiple Choice

NO gas is converted to NO₂ gas according to the following reaction:
NO(g) + $$\frac { 1 } { 2 }$$ O₂(g) $\rightarrow$ NO₂(g)
What is the standard entropy change when 0.5 mol of NO gas reacts with 0.5 mol of O₂ gas? $$\begin{array} { l c } \text { Substance } & \boldsymbol { S } ^ { \circ } ( \mathbf { J } / \mathbf { m o l } \cdot \mathbf { K } ) \\\mathrm { NO } ( g ) & 210.7 \\\mathrm { O } _ { 2 } ( g ) & 205.0 \\\mathrm { NO } _ { 2 } ( g ) & 240.0\end{array}$$

A) -36.6 J/K
B) -175.7 J/K
C) -83.4 J/K
D) +83.4 J/K
E) +36.6 J/K