相律 Phase rules 例1 CaCO3(s)= Cao(s) Co2(g Phase 1 Phase 2 Gas phase Number of phases, P=3 Number of constituents 3 Number of Components, C=2 CacO, can be expressed in terms of 2 components in two different phases from the stoichiometry of the reaction 1jJ2 Consider the thermal decomposition of ammonium chloride NH,CI(s NH3(g) HcI (g) Number of phases P=2 Number of constituents 3 Number of Components, C=1 NH3 and HCl are fixed in stoichoimetric proportions by the reaction, and compositions of both phases can be specified by nhcl 组分数C=物种数一独立化学平衡数一独立浓度关系数 注意独立浓度关系只限于同一相中相 律 Phase Rules 例1 例2 组分数 C = 物种数 – 独立化学平衡数 – 独立浓度关系数 注意:独立浓度关系只限于同一相中