What conversion factor is present in almost all stoichiometry calculations?

Answer;

Molar mass

Explanation; Stoichiometry involves the study of quantitative relationships between the amounts of reactants used and products formed by a chemical reaction. A conversion factor is a ratio of coefficients found in a balanced reaction, which can be used to inter-convert the amount of products and reactants. Molar ratios, or conversion factors, identify the number of moles of each reactant needed to form a certain number of moles of each product.