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It depends on the equation.
This depends on the other reactants !
balanced equation
The information in a balanced chemical equation shows how many moles of a reactant are involved in a reaction is the number appearing immediately before the formula for the reactant in question in the chemical equation. This number is called a "coefficient".
The chemical formula for it is PbI2, but to have an equation there must be another reactant or specified phase.
It depends on the equation.
In a balanced chemical equation the number of molecules or atoms are specified.
from a balanced chemical equation
The number before the chemical formula of the reactant.
This depends on the other reactants !
balanced equation
In a complete and correctly balanced chemical equation you will have the coefficients for each reactant and product indicating the mole ratios as well as the phases of each reactant and product.
These data are given by the correct coefficients in the chemical equation.
The information in a balanced chemical equation shows how many moles of a reactant are involved in a reaction is the number appearing immediately before the formula for the reactant in question in the chemical equation. This number is called a "coefficient".
stoichiometric
The chemical formula for it is PbI2, but to have an equation there must be another reactant or specified phase.
balanced equuation A+