Important Chemistry Formulas

Mass = # of protons + # of neutrons

Average atomic mass = (% abundance*atomic mass of isotope) + (% abundance*atomic mass of isotope)

Density= mass/volume (heart)

Percent error = |Measure value-accepted value/ accepted value| * 100

Half life = m2=m1(1/2)(t²/t^1)

m2= mass remaining

m1= original mass

t2= time

t1= half life

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