ch.11

the Si base unit used to measure the amount of a substance

it is the number of carbon atoms in exactly 12g of pure carbon-12

• Mole

• Avogado's Number

• 6.02 x 10^23

• a mole of anything contains 6.02 x 10^23

• Avogadro's number

• mole

understanding Avogadro's Number

a mole is used to count large amounts of things

• 1 pair = 2

• 1 dozen = 12

• 1 ream = 500

• 1 gross = 144

• 1 mole = 6.02 x 10^23

select all that apply

FAIM

• 1 mole = 6.02 x 10^23 atoms

• 1 mole = 6.02 x 10^23 particles

• 1 mole = 6.02 x 10^23 formula units

• 1 mole = 6.02 x 10^23 molecules

the mass in grams of one mole of any pure substances

• molar mass

• mole

• atomic number

• percent composition

the molar mass of any element is equal to its atomic mass expressed in grams per mole

the molar mass of any compound is equal to the sum of the atomic masses of each elements in grams per mole (g/mol)

• true

• false

the __________ of a compound tells you how many moles of each element are in one mole of a compound

• subscripts

• exponents

the percent by mass of each element in a compound

• percent composition

• molar mass

• mole

• hydrate

the formula with the smallest whole-number mole ratio of the elements

• empirical formula

• molecular formula

the formula that represents the actual number of atoms of each element in one molecule or formula unit of a substance

• molecular formula

• empirical formula