What does the little 2 in 2CO2 mean?

Write a net ionic equation to show that hydrofluoric acid, behaves as an acid in water.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

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