题干
You are supposed to be more careful to make fewer while you are writing.
A：trouble
B：matter
C：mistakes
D：problems
答案(点此获取答案解析）
C
You are supposed to be more careful to make fewer while you are writing.
A：trouble
B：matter
C：mistakes
D：problems
nC(g)+2D(g) 达到平衡后，A物质的量浓度减小1/2，混合气体的平均摩尔质量增大1/8，则该反应的化学方程式中n的值是