Ions, isotope, average atomic mass fill in the blank

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

Which compound contain an iron with a 3+ charge