题目内容
A.70% B.52.4%
C.47.6% D.30%
A.70% B.52.4% C.47.6% D.30%
A.70% B.52.4% C.47.6% D.30%
把a g铁铝合金粉末溶于足量盐酸中,加入过量的NaOH溶液。过滤出沉淀,经洗涤、干燥、灼烧,得到红棕色粉末的质量仍为a g,则原合金中铁与铝的物质的量之比为( )
A.9∶8 B.8∶9
C.1∶1 D.7∶3