Where does the mole ratio come from? the group number of each element in the balanced chemical equation the subscripts of the products in the balanced chemical equation the coefficients of the balanced chemical equation the molar mass of the reactants in the balanced chemical equation

## Step 1
The mole ratio in a chemical equation is derived from the coefficients of the balanced chemical equation. A balanced chemical equation is one in which the number of atoms of each element is the same on both the reactant and product sides of the equation. The coefficients in a balanced chemical equation represent the number of moles of each compound involved in the reaction.

## Step 2
The group number of each element in the periodic table does not determine the mole ratio. The group number of an element refers to the number of valence electrons in the outermost shell of an atom of that element. This is a property that influences the chemical reactivity of an element but does not directly determine the mole ratio in a chemical equation.

## Step 3
The subscripts of the products in the balanced chemical equation indicate the number of atoms of each element in a molecule of the product, not the mole ratio. For example, in $H_2O$, the subscript 2 indicates that there are two hydrogen atoms in one molecule of water, but it does not provide information about the mole ratio in a chemical reaction.

## Step 4
The molar mass of the reactants in the balanced chemical equation is the mass of one mole of a substance and is used to convert between the mass of a substance and the number of moles. While molar mass is a crucial concept in stoichiometry, it is not the source of the mole ratio in a chemical equation.