In chemical equations, the principle of "consistent up and down, equal left and right" should be maintained when calculating column proportions. That is: the physical quantity and unit of the same substance must be the same, the physical quantity and unit of different substances can be different, and each physical quantity can be converted into each other through the quantity of the substance.
For example: C+O2=CO2
C can be expressed in grams, and grams are also used below.
The number of moles of CO2 is available, and the number of moles is also used below.
As long as the top and bottom are consistent.