Ch.11 Chemistry Mole – Flashcards

the SI Base unit used to measure the amount of a substance. It is the number of representative particles, carbon atoms, in exactly 12 g of pure carbon 12 We use the term the Mole to represent Avogadro's number A mole of atoms is 6.022 x 10 23 atoms, much like a dozen atoms is 12 atoms. AMU of Aluminum = 26.98 AMU of Copper is =63.55 AMU of Carbon is 12.01 So, 26.98 grams of aluminum, 63.55 grams of copper, and 12.01 grams of carbon each contain 6.022 x 10 23 atoms! 26.98 g of Al = 1 mole Al = 6.022 x 1023 atoms

6.02 x 10 to the 23 in 1811 Avogadro determined the volume of one mole of a gas. 3.5 mole sucrose x (6.02 x10 23 molecules of sucrose)/1 mol sucrose = 2.11 x10 24 molecules sucrose. There are 2.11 x 10 24 molecules of sucrose in 3.5 moles Number of moles x Av.Number = # of molecules

The mass in grams of one mole of any substance. The molar mass of any element is numerical equal to its atomic mass and has the units g/mol. Moles x molar mass = grams

Measuring out the average atomic mass of an element in grams is measuring out a mole of atoms or 6.022 x 10 23 atoms.