Which of the following is a strong electrolyte? A. Br₂ (l)
B. KClO₄ (aq)
C. HClO₂ (aq)
D. HC₂H₃O₂ (aq)
E. H₂ (g)

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Adilute aqueous potassium nitrate solution is

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?