Presentation on theme: "The Mole 1 dozen = 12 1 gross = 144 1 ream = 500 1 mole = 6.02 x 1023."— Presentation transcript:
1 The Mole1 dozen =121 gross =1441 ream =5001 mole =6.02 x 1023
2 I didn’t discover it. Its just named after me! Avogadro’s Number6.02 x 1023 is called “Avogadro’s Number” in honor of the Italian chemist Amadeo Avogadro ( ).I didn’t discover it. Its just named after me!Amadeo Avogadro
15 Standard Temperature and Pressure “STP” P = 1 atmosphere, kPaT = 0°C, 273 KelvinsThe molar volume of an ideal gas is 22.4 liters at STP
16 Calculating Percentage Composition Calculate the percentage composition of magnesium carbonate, MgCO3.24.0 g g + 3(16.0 g) = 84.0 g100.00
17 Formulas molecular formula = (empirical formula)n [n = integer] Empirical formula: the lowest whole number ratio of atoms in a compound.Molecular formula: the true number of atoms of each element in the formula of a compound.molecular formula = (empirical formula)n [n = integer]molecular formula = C6H6 = (CH)6empirical formula = CH
18 Formulas (continued)Formulas for ionic compounds are ALWAYS empirical (lowest whole number ratio).Examples:NaClMgCl2Al2(SO4)3K2CO3
19 Formulas (continued)Formulas for molecular compounds MIGHT be empirical (lowest whole number ratio).Molecular:H2OC6H12O6C12H22O11Empirical:H2OCH2OC12H22O11
20 Empirical Formula Determination Base calculation on 100 grams of compound.Determine moles of each element in 100 grams of compound.Divide each value of moles by the smallest of the values.Multiply each number by an integer to obtain all whole numbers.
21 Empirical Formula Determination Adipic acid contains 49.32% C, 43.84% O, and 6.85% H by mass. What is the empirical formula of adipic acid?
22 Empirical Formula Determination (part 2) Divide each value of moles by the smallest of the values.Carbon:Hydrogen:Oxygen:
23 Empirical Formula Determination (part 3) Multiply each number by an integer to obtain all whole numbers.Carbon: 1.50Hydrogen: 2.50Oxygen: 1.00x 2x 2x 2352Empirical formula:C3H5O2
24 Finding the Molecular Formula The empirical formula for adipic acid is C3H5O2. The molecular mass of adipic acid is 146 g/mol. What is the molecular formula of adipic acid?1. Find the formula mass of C3H5O23(12.0 g) + 5(1.0) + 2(16.0) = 73.0 g
25 Finding the Molecular Formula The empirical formula for adipic acid is C3H5O2. The molecular mass of adipic acid is 146 g/mol. What is the molecular formula of adipic acid?3. Multiply the empirical formula by this number to get the molecular formula.3(12.0 g) + 5(1.0) + 2(16.0) = 73.0 g(C3H5O2) x 2 =C6H10O4