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To find the number of atoms or molecules you need to use the mole method.
B)
After given the formula weight you need to find the mass and find density x volume of a pure material
C)
Density- the ratio of mass to unit volume expressed in grams or cm3 for solids and liquids but in gas its grams and liters
STP- Standard Temperature and Pressure, which is used to calculate gasses
Concentration- the amount of a substance per defined space
Volume- quantity of three dimensional space occupied by a liquid, solid, and gas
Molecules- a group of two or more atoms stuck together
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