\(a.\)
\(M_O=16\left(g\text{/}mol\right)\)
\(M_{O_2}=16\cdot2=32\left(g\text{/}mol\right)\)
\(b.\)
\(M_{Fe}=56\left(g\text{/}mol\right)\)
\(M_{Fe_2O_3}=160\left(g\text{/}mol\right)\)
\(c.\)
\(M_N=14\left(g\text{/}mol\right)\)
\(M_{NO_2}=14+16\cdot2=46\left(g\text{/}mol\right)\)
\(d.\)
\(M_{C_6H_{12}O_6}=12\cdot6+12+16\cdot6=180\left(g\text{/}mol\right)\)
a) \(\left\{{}\begin{matrix}M_O=16\\M_{O_2}=32\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}M_{Fe}=56\\M_{Fe_2O_3}=160\end{matrix}\right.\)
c) \(\left\{{}\begin{matrix}M_N=14\\M_{NO_2}=46\end{matrix}\right.\)
d) \(M_{C_6H_{12}O_6}=180\)