Each term of a chemical compound required for the given statements are in bold letters as depicted below.
<h3>How to define chemical compounds?</h3>
1) The chemical compounds that are present before a reaction occurs is called; reactants
2) The compounds produced from the reaction are called; products
3) Unit of measure, containing Avogadro's number is called; Mole
4) The quantitative proportion of reactants to products is called; Stoichiometry.
5) Two solutions are mixed and an insoluble substance forms; A precipitation reaction
6) An illustration of the reaction that occurs between two or more chemical compounds is called; chemical equation
7) A solid compound that contains water molecules is called hydrates.
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Considering the definition of percentage by mass, the sample of pure lithium nitrate contains 7.99% lithium by mass.
<h3>Definition of percentage by mass</h3>
The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

<h3>This case</h3>
Because percent by mass indicates the ratio of solute to solution based on mass, if the sample has twice the mass of the first sample, the ratio remains constant.
So the percentage by mass is the same.
That is, the sample of pure lithium nitrate contains 7.99% lithium by mass.
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Jackson.
Jackson encouraged Congress to adopt the Removal Act of 1830. The Act established a process whereby the President could grant land west of the Mississippi River to Indian tribes that agreed to give up their homelands.
Answer:
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