Physical Chemistry Chapter 7 The phase rule ● Counting components How many components are present in a system in which ammonium chloride undergoes thermal decomposition? NH4CI(S+ NH3(8)+ HClg Phase 1 Phase 2 three constituents two-component a one-component system additional NHC1∠NH3 or hcl NH4CI→NH3+HC17 The Phase Rule Counting components NH4Cl(s)  NH3 (g) + HCl(g) Phase 1 a one-component system NH4Cl Phase 2 NH4Cl → NH3 + HCl How many components are present in a system in which ammonium chloride undergoes thermal decomposition? three constituents additional NH3 or HCl two-component Physical Chemistry Chapter 7