Which species is reduced in the following reaction? H2SO4 + HBr -> SO2 + Br2 + H2O

What happens to energy in an open system?

How many atoms are in 2 moles of phosphorus

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)