P1 3 Quantitative Chem
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state the equation for relative atomic mass of an element
(percentage of isotope1 x its mass) + (percentage of isotope2 x its mass) / 100
state the equation for relative formula mass
(no. of atom1 x its relative atomic mass) + (no. of atom2 x its relative atomic mass)
state the equation for percentage by mass of a compound
(no. of atom1 x its relative atomic mass) / total relative formula mass of compound x 100
state the equation linking moles, mass, and relative formula mass
mass = Mr x moles moles = mass / Mr
state the Avogadro constant
6.022 x 10²³ the number of particles in 1 mole of any substance
define a mole
• the relative formula mass in grams • applies to atoms, molecules, ions, electrons
state the equation for concentration of a solution
concentration = mass of solute / volume of entire solvent (g/dm³) (g) (dm³)
state why whenever a measurement is made there is always some uncertainty about the result
• due to: random error, limited resolution of instruments used • uncertainty of a mean result can be calculated using uncertainty = (range/2) • uncertainty can be reduced by: repeating experiments, testing more samples • you can have more confidence in results with a smaller uncertainty • results with a smaller range are more precise