janibasha08102

The volume of a cube is 125 . Find the length of the edge of the cube.

Teacher's comment: Count and find out what number when multiplied by 3 will give you 125.

Iron (III) oxide may be reduced to pure iron either with carbonmonoxide or with coke (pure carbon). Suppose that 150kg of ferricoxide are available. How many kilograms of carbon monoxide would berequired to reduce the oxide? How many kilograms of coke would beneeded? In each case, how many kilograms of pure iron would beproduced?

The equations are:
Fe2O3 3CO --> 2Fe 3CO2

2Fe2O3 3C --> 4Fe 3CO2

A norman window has the shape of a rectangle surmounted byasemicircle. (Thus the diameter of the semicircle is equal tothewidth of the rectangle.) If the perimeter of the window is 30ft,find the dimensions of the window so that the greatestpossibleamount of light is admitted.

Crude iron is obtained in a blast furnace by reaction of iron ore, one component of which is

magnetite, Fe3O4, with carbon monoxide:

Fe3O4 (s) + 4 CO (g) 3 Fe (l) + 4 CO2 (g)

The carbon monoxide, in turn, is prepared in part by the combustion of coke, which is 85 to 90%

percent by weight carbon, according to the reaction

2 C (s) + O2 (g) –––> 2 CO (g)

How many kilograms of Fe3O4 are required to prepare 1.00 kg of crude iron? How many kilograms of

coke, assumed to be 90% by weight carbon, are needed?