Relative atomic mass = atomic mass/(112 carbon atom mass)

Number of electrons = number of protons = number of nuclear charges

The algebraic sum of positive and negative valence in chemical formula is zero.

Solute mass fraction = solute mass/solution mass

Before and after the chemical reaction: the number of atoms remains unchanged, the species remains unchanged, and the mass of elements remains unchanged.

The number and type of molecules will not necessarily change.

The generated gas should have a gas symbol, and the precipitation should have a precipitation symbol.