Chapter 5

Question 1

what is the avogadros number

Answer 1

6.02 x 10^23

Question 2

the atomic mass on the periodic table indicates?

Answer 2

the mass of one atom (in atomic mass unit)

Question 3

the mass of atoms

Answer 3

1 atom = 6.022 x 10^23 atoms
avg mass of 1 C atom = 12.01 amu
total mass of 6.022 x 10^23 C atoms = 12.01 g

Question 4

the mass in gram for a collection of 6.022 x 10^23 of any type of atoms has?

Answer 4

the same numerical value as the mass of a single atom in the unit of amu

Question 5

mole: the chemists dozen

Answer 5

dozen = 12
mole = 6.022 x 10^23 (avogadro's number)

Question 6

relationship between atom amu -> atom g -> 1 mole

Answer 6

1 atom (atomic mass; atomic weight) amu = 6.022 x 10^23 g atoms (total mass) = 1 mole (total mass; molar mass)

Question 7

microscopic - molecular mass

Answer 7

1 atom of C = 12.01 amu

1 molecule of CO2 = 1 molecule of (12.01 + 32) = 44.01 amu

Question 8

macroscopic = molar mass

Answer 8

1 mole of C = 12.01 gram

1 mole of CO2 = 12 + 32 = 44.01 gram

Question 9

What is a mole?

Answer 9

Counting unit for a chemist

- avogados number