Mole Basics
The number of atoms in one mole of an element is equal to
Avogadro's number, 6.02 x 1023
What does the mole establish a relationship between?
the atomic mass unit and the mole
What is the molar mass of PbSO4?
*Round your answer to 4 sig figs*
303.3 g/mol
What is the percentage composition equation?
% Comp = (mass of element/total mass of compound) x 100
When does the 2026 World Cup start?
June 11th 2026
Where do I find atomic mass and what unit does it have?
The Periodic Table
Unit: atomic mass units (amu)
What amount of volume of a gas is in 1 mole of a gas?
22.4L
What is the molar mass of water?
*Round your answer to 4 sig figs*
18.02 grams per mole
An certain amount of hydrogen gas occupies 48 L at STP. How many moles of hydrogen atoms are present?
*Round your answer to 3 sig figs*
2.14 moles
What is Mrs. Mesa's favorite color?
peach
Describe how to determine the molar mass of a compound.
Find the atomic mass of each element in the compound, multiply by # of atoms if more than 1, add up all of the masses to get the total molar mass.
What would be the step-by-step process for going from mass to volume?
grams --> moles --> liters
How many grams are in 5 moles of water?
*Round your answer to 1 sig fig*
90 grams
What volume will 5 moles of vaporized HCl occupy at standard temperature and pressure?
*Round your answer to 3 sig figs*
112 L
How many bones are in the human body?
What is the difference between formula mass and molar mass?
They are the same value numerically but formula mass is in the units amu and molar mass is in the units gram/mole.
It is possible to convert moles to particles by _______________.
multiplying by 6.02 x 1023
How many grams are in 7.5 moles of HCl?
*Round your answer to 3 sig figs*
273 grams
What is the percentage composition of ammonia (NH3)?
82.2% N
17.8% H
Who painted the ceiling of the Sistine Chapel?
Michelangelo
The scale for expressing atomic masses is based on the mass of _______________.
carbon-12
How many grams of O2 are in a balloon holding 44.8L of the gas at STP?
Liters --> Moles --> Grams
64.0 grams
Suppose a ring contains 2.30 x 1022 atoms of silver. How many grams of silver would be in the ring?
*Round your answer to 3 sig figs*
Particles --> Moles --> Grams
4.12 grams
What is the name of the college Mrs. Mesa went to?
Worcester State University