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1

Weighted Average Atomic Mass

Multiply amu by percentage

Add values together

Answer is the average amu

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2

Molar mass

the mass of 1 mole of ___ in grams

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3

Avogadro’s Number and Mole

1 mole = N_{A} = 6.022 × 10^{23}

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4

Unit Conversions

6.022 × 10

^{23}atoms / 1 molegrams (avg atomic mass) / mole

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5

Natural Abundance

Average Atomic Mass = (x (#amu

_{1}) ) + ( [1 - x] (#amu_{2}) )Answer is relative abundance for element 1

x + (1 - x) = 1

Answer is relative abundance for element 2

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6

Percent Composition

( n x molar mass of element ) / ( molar mass of compound ) x 100%

n is the number of moles of the element in 1 mole of the compound

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7

Calculating the empirical formula from the mass percent composition

Assume 100 grams of a compound (percentages then become grams)

Calculate the moles of each element

Divide by the smallest number to obtain the subscripts in the empirical formula

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8

Converting empirical formulas to molecular formulas

molecular formula molar mass / empirical formula molar mass

Answer is the multiplier of each subscript in empirical formula

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