How would I Calculate the loss of mass for each sample. The total mass lost between the first weighing (before heating)and the last weight taken will be equal to the mass of water lost. How would I Calculate the mass% of water in your solid product for each trial, then average the two determinations. )Compare to the theoretical mass%) water. How do I also find the theoretical mass%. I need to understand how to do all this before lab , please show all work, thank you

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".