Warm-Up 4/16/2015 Which Statement correctly compares an atom of boron-11 and an atom of carbon-14? An atom of boron-11 has one fewer proton and two fewer neutrons than an atom of carbon 14 An atom of boron-11 has one fewer neutron and two fewer protons than an atom of carbon-14 An atom of boron-11 has one fewer proton and three fewer neutrons than an atom or carbon-14 An atom of boron-11 has one fewer neutron and three fewer protons than an atom of Carbon-14

The Mole Because matter typically contains so many atoms, ions, and other particles, a unit of measurement called the mole was established The mole is useful in counting the number of atoms, ions, and other particles

More about the Mole The mole represents amount of substance Amount of a substance can be referred to as either particles, atoms, ions, and molecules

The Scientific Definition of the Mole Scientifically, the mole (abbreviated mol) is the number equal to the number of carbon atoms in exactly 12 g of pure C-12 1 mol = 6.022 x 1023 particles

Application of the Mole How many atoms are in one mole? How many particles are in 1.67 moles?

2) How many molecules are in 2.0 mole of H2O? Practice Problems 1) How many atoms are in 4.5 mole of aluminum? 2) How many molecules are in 2.0 mole of H2O? 3) How many ions are in 5.0 mole of (CO3)2-

Answers 1. 2.7 x 1024 aluminum atoms 2. 1.2 x 1024 H2O molecules 3. 3.0 x 1024 (CO3)2- ions

More Practice Problems Solve the following problems How many moles are in 2.5 x 1034 atoms of calcium? How many moles are contained in 3.45 x 1029 ions of Mg2+?

Solve the following problems How many moles are contained in 3.667 x 1030 molecules of SO? How many moles are in 3 x 1023 molecules of O2?

Molar Mass or Gram formula Mass The molar mass is the mass of 1 mole of a substance 1 mole = molar mass (of any substance)

Use of Molar Mass CO2 has a molar mass of 44 g Therefore 1 mole of CO2 has a mass of 44 g 1 mole CO2 = 44 g CO2

How many moles are in 300 g CO2? Example How many moles are in 300 g CO2? 1) Determine the relationship between g CO2 and moles of CO2. 2) Use factor label to solve.

44 g CO2 = 1 mole CO2 300 g CO2 1 mole CO2 44 g CO2 = 6.82 mole CO2

3) Determine the number of grams present in 3.02 moles of CCl4 Practice Problems 1) How many grams are present in 3.45 moles of H2O? 2) Convert 29.7 g CH4 to moles. 3) Determine the number of grams present in 3.02 moles of CCl4 4) How many moles are present in 200.3 g of NaCl?