How do you calculate the mass of an atom

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?