可逆反应\(\rm{2SO_{2}+O_{2}⇌2SO_{3}}\)达到平衡的标志是\(\rm{(}\) \(\rm{)}\)
\(\rm{①}\)消耗\(\rm{2mol}\) \(\rm{SO_{2}}\)的同时生成\(\rm{2mol}\) \(\rm{SO_{3}}\)
\(\rm{②SO_{2}}\)、\(\rm{O_{2}}\)与\(\rm{SO_{3}}\)的物质的量之比为\(\rm{2}\):\(\rm{1}\):\(\rm{2}\)
\(\rm{③}\)反应混合物中,\(\rm{SO_{3}}\)的质量分数不再改变
\(\rm{④}\)恒容条件下压强保持不变
\(\rm{⑤}\)一定体积下气体的密度保持不变
\(\rm{⑥v_{正}(SO_{2})=2v_{逆}(O_{2})}\)