Atoms
How many atoms are in 1 mole?
6.02 x 1023 atoms
What is the mole?
A unit that represents an amount, a counting unit
How many moles in 2.65 g Fe? Molar mass Fe = 55.85 g/mol
(gram to mole)
0.0474 mol Fe
What is Avogadro's Number?
6.02 x 1023
How is mass in grams converted to amount in moles?
Divide by the molar mass
Define the atom and what it is made out of.
The simplest unit of all matter, made of +protons, neutrons, and -electrons
How many moles are in 1.01 g of Hydrogen?
1 mol
How many grams in 6.50 moles Cu? Molar mass Cu = 63.5 g/mol)
(mole to gram)
413 g Cu
State the missing part:
? = 1 mole = 6.02x1023 atoms
molar mass = 1 mole = 6.02 x 1023 atoms
How is the mass in grams of a substance converted to atoms?
2 steps:
Divided by molar mass, then multiply by Avogadro's Number
How many moles in 3.011 x 1023 atoms Mg?
(atom to mole)
0.500 mol
How many moles in 0.00750 g Ag? Molar mass Ag=107.9 g/mol
(gram to mole)
6.95 x 10^-5 mol OR
0.0000695 mol
How many moles are in 0.535 g Zn? Molar mass Zn = 65.4 g/mol.
(gram to mole)
0.00818 mol Zn
What is the molar mass of Arsenic (As)?
74.9 g/mol
How many atoms in 0.250 mol S?
(mole to atom)
1.51 x 10^23 atoms S
How many moles in 2.25 x 10^25 atoms Zn?
(atom to mole)
37.4 mol Zn
How many atoms in 5.0 g C? molar mass C = 12.01 g/mol
(gram to atom) (2 steps)
2.5 x 1023 atoms
What is the molar mass of O2 ?
32.0 g/mol
How many atoms are in 12.01g of Carbon (C)?
6.02 x 1023 atoms
How many moles in 150 g S? (Molar mass of S = 32.1 g/mol)
(gram to mole)
4.7 mol S
How many grams in 8.42 x 1023 atoms Br? Molar mass Br = 79.9 g/mol.
(atom to gram) (2 steps)
111.7 g
What is the molar mass of Fe2O3?
159.7 g/mol
State the Law of Conservation of Mass
Mass cannot be created nor destroyed, it may only change form.
Mass before a reaction = mass after a reaction