Mass-Mass Relationships
Introduction: A mass of any product and reactant in a chemical equation can be found by only knowing the mass of one reactant/product. The mass of the known substance is turned into moles, and by using the mole ratio, the number of moles of the unknown substance can be calculated. This number is then switched into the mass by multiplying it by its molar mass.
In the following experiment, 3 grams of sodium carbonate, Na2CO3 is measured out and then an excess of 10% of HCl would be added to make sure the sodium carbonate react completely.
Na2CO3 (s) + 2HCl (l) → 2NaCl (s) + H2O (l) + CO2 (g)