How many molecules are in 3.94g of so2?

What’s the percent by mass of carbon in c10h14n2

Which sample at stp has the same number of atoms as 18 liters of ne at stp

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.