Hello
Thank you for not answering my question

Name the element in group 17, period 2. (periodic table)

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)

In the diagram here that represents the reaction, which reactant, a or b, is the limiting reagent?