In the blast furnace, the overall reaction is: 2Fe2O3 (s) + 3C (s) → 3C02(g) + 4Fe (s)
What is the maximum mass of iron that can be obtained from 500 g of iron III Oxide and 50g of
Coke?

answer;

18.5 seconds

explanation;

velocity is distance covered per unit time; it is given by displacement divided by time.

thus; time = displacement/velocity

total time = total displacement/velocity

total distance = 5000 meters south

total time = 5000/4.5

                  = 1111.11 seconds

but; 1 minute = 60 sec

thus; 1111.11 /60

                = 18.51 seconds

thus; the time taken is 18.5 seconds

the enthalpy change that occurs in a system when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states.