某校兴趣小组取一定量的氯酸钾和二氧化锰的混合物放入大试管中加热。剩余固体质量与时间的变化如下表所示：                                                                                                                                                      

时间/min	t0	t1	t2	t3	t4	t5	T6
剩余固体质量/g	26.5	26.5	24.1	21.7	m	16.9	16.9