Đáp án đúng: C
Giải chi tiết:\(\begin{gathered} Cu{(N{O_3})_2}\xrightarrow{{{t^o}}}CuO + 2N{O_2} + \frac{1}{2}{O_2} \hfill \\ x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2x\,\,\,\,\,\,\,\,\,\,0,5x \hfill \\ {m_{giam}} = {m_{N{O_2}}} + {m_{{O_2}}} \to 0,54 = 2x.46 + 0,5x.32 \to x = 0,005(mol) \hfill \\ \to {m_{Cu{{(N{O_3})}_2}}} = 0,005.188 = 0,94(g) \hfill \\ \end{gathered} \)
Đáp án C