Components in a System Containing NH4Cl, NH3 and HCl

There are two components in a system containing NH4Cl, NH3, and HCl. This is because NH4Cl, NH3, and HCl all belong to the same chemical system, which is the aqueous solution. The two components in this system are:

1. NH4+ ions
2. Cl- ions

Explanation

To understand why NH4+ ions and Cl- ions are the only components in this system, it is important to understand what a component is. A component is a pure substance or a mixture of pure substances that cannot be separated into simpler substances by any physical or chemical means. In other words, a component is a fundamental building block of a system.

In the case of NH4Cl, NH3, and HCl, these three substances are all soluble in water, and when they are dissolved in water, they dissociate into their respective ions. NH4Cl dissociates into NH4+ and Cl-, NH3 dissociates into NH4+ and OH-, and HCl dissociates into H+ and Cl-. However, since the NH3 and HCl are present in equal amounts, they react with each other to form NH4+ and Cl-, which are the only two components in the system.

Therefore, the number of components in a system containing 1 mole of NH4Cl, 0.5 mole of NH3, and 0.5 mole of HCl is two, which are NH4+ ions and Cl- ions.