Calcium oxide or quicklime (cao) is used in steelmaking, cement manufacture, and pollution control. it is prepared by the thermal decomposition of calcium carbonate: caco3(s) → cao(s) + co2(g) calculate the yearly release of co2 (in kg) to the atmosphere if the annual production of cao in the united states is 2.1 × 10^10 kg.

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation: