Question

化学反应A+2B=C+D,5.6gA与7.3gB恰好完全反应,生成12.7gC.现要制的0.4gD,则需A质量为

Answer 1

(1)

M(D)=5.6+7.3-12.7=0.2g

0.4/0.2=X/5.6

故：M(A)=5.6*2=11.2