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what is the formula to calculate the percentage by mass of an element
% Mass of Element = (Relative Atomic Mass of Element / Relative Formula of Compound) x 100
what is the principle of the conservation of mass
Mass is neither created nor destroyed in a chemical reaction. The mass of reactant used and the mass of products formed are equal.
is the measured mass of the product always equal to the mass of the reactant
no
when does this tend to happen in a reaction
When one or more of the products formed is a gas
Note 
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