An ore of iron has the formula Fe3O4. What is the approximate percentage of iron in this ore?A:72B:42C:52D:62

Iron(III) oxide, Fe2 O3 , in iron ore is converted to iron when it reacts with carbon monoxide, CO,in the blast furnace.(i) Calculate the percentage by mass of iron in iron(III) oxide, Fe 2 O3 .percentage = ..............................% [2](ii) State the name of the iron ore which consists mainly of iron(III) oxide........................................................................................................................................ [1](iii) Describe how carbon monoxide is formed in the blast furnace........................................................................................................................................ [1](iv) Write the symbol equation to show the reaction that occurs when iron(III) oxide is convertedto iron in the blast furnace........................................................................................................................................ [2](v) Name the chemical process which happens to iron when iron(III) oxide is converted toiron in the blast furnace........................................................................................................................................ [1](c) State the type of reaction shown by equation 2............................................................................................................................................... [1]

Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass.

What is the oxidation number of iron in Fe2O3?A.+6B.+2C.+4D.+3

When iron and steam react at high temperatures, the following reaction takes place.3Fe(s)  +  4H2O(g)  →  Fe3O4(s) +  4H2(g)How much iron must react with excess steam to form 300 g of Fe3O4(s) if the reaction yield is 69%?

The following steps were carried out to determine the percentage of iron in an iron wire. a) The iron wire was weighed and the mass reading was recorded.                                Mass reading = 4.80 g b) The wire was reacted with excess dilute hydrochloric acid at room temperature and pressure.  It was found that  of hydrogen gas was given off at room temperature and pressure.  What is the percentage purity of the iron wire?