The value of H° for the reaction below is -72 kJ. kJ of heat are released when 5.5 mol of HBr is formed in this reaction.

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

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

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)