\(m_{Fe_3O_4}=\dfrac{1.75}{100}=0,75\left(tấn\right)=750\left(kg\right)\)
1 mol Fe3O4 tạo ra 3 mol Fe
=> 232g Fe3O4 tạo ra 168g Fe
=> 750g Fe3O4 tạo ra \(\dfrac{15750}{29}\)g Fe
=> 750 kg Fe3O4 tạo ra \(\dfrac{15750}{29}\) kg Fe
=> \(m_{gang}=\dfrac{\dfrac{15750}{29}.100}{98}=554,2\left(kg\right)\)
=> D