The Mole
A unit in chemistry used to count atoms and molecules
Molar mass of sodium (Na).
22.99
How to convert from grams to moles.
Divide by molar mass
How to convert from moles to grams
If I have 4 slices of bread, and 3 pieces of cheese, I can make this many cheese sandwiches (each sandwich contains 2 bread and 1 cheese).
2 cheese sandwiches
This number was named after Avogadro and represents 1 mole of anything.
6.022x10^23
Molar mass is the same value as this mass found on the periodic table.
Atomic mass
How to convert from # atoms to moles.
Divide by 6.022x10^23
How to convert from moles to # atoms (or molecules).
Multiply by molar mass.
In a chemical equation, coefficients are also known as these.
Mole values
The mole is similar to a dozen or another counting number in this way.
It represents an amount (6.022x10^23) of items.
This process describes how to calculate molar mass for a compound.
Find atomic mass for all elements in the compound, multiply each by their subscripts, and add them together.
The number of moles in 1.5x10^23 atoms of Fe.
0.25 moles
True or false: there is a direct conversion step between #atoms and grams.
False
According to the formation of water: 2H2 + O2 --> 2H2O, If I have 2 moles of hydrogen, I can form this many moles of water.
2 moles of water
Gold
Molar mass of NH4Cl
53.50
The number of grams in 3.25 moles of Ca
130.26 grams Ca
3.90x10^24 atoms Li
According to the formation of water equation, if I begin a reaction with 3 moles of oxygen, I can make this many moles of water.
1.5 moles of water.
True or false: a mole of gold and a mole of silver would contain the same amount of particles.
True
Molar mass of Al(OH)3
78.01
The number of moles in 78 grams of NaOH
1.95 moles of NaOH
The number of grams in 2.5x10^24 atoms of K2SO4.
723.18 grams K2SO4
According to the formation of water equation, if I want to make 5.25 moles of water, I need this many moles of oxygen for the reaction.
2.63 moles oxygen.