What is the isotope of iron

One of the reactions in a blast furnace used to reduce iron is shown above. how many grams of fe2o3 are required to produce 15.5 g of fe if the reaction occurs in the presence of excess co? a.11.1 g b.22.1 g c.30.0 g d.44.2 g

This drawing shows a human body system. what is the primary function of this body system?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains