Haemoglobin contains 0.33% by mass of iron there are two iron atoms in one molecule of haemoglobin, what's the relative molecular mass of haemoglobin?

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Which fact represents evidence for the big bang theory?

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.