Fe:56O:16Fe2O3:160
mFe2O3=76%m总=76%*5000t=3800t
则mFe=mFe2O3*(56/160)=3800t*(56/160)=1330t
m生铁=mFe/98%=1330t/98%=1357.1t
答：生铁质量为1357.1t.