relative formula mass
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1
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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
2
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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.
3
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is the measured mass of the product always equal to the mass of the reactant
no
4
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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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