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 gram
What is the molar mass of NH4OH?
*Write your answer with 4 sig figs and the correct unit*
35.06 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?
*Write your answer with 4 sig figs*
18.02 grams per mole
A certain amount of hydrogen gas occupies 48 L at STP. How many moles of hydrogen atoms are present?
*Write your answer with the same # of sig figs as your starting value*
2.1 moles
What is the name of the college Mrs. Mesa went to?
Worcester State University
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
Mass --> Moles --> Volume
How many grams are in 5 moles of water?
*Write your answer with the same # of sig figs as your starting value*
90 grams
What volume will 5.00 moles of vaporized HCl occupy at standard temperature and pressure (STP)?
*Write your answer with the same # of sig figs as your starting value*
112 L
I bet you thought this would be an easy question..
What coefficient should be replaced where the x is to balance this equation?
1Ca3(PO4)2 + 3SiO2 + 5C ---> 3CaSiO3 + x CO + 2P
5
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 x1023
How many grams are in 7.5 moles of HCl?
*Write your answer with the same # of sig figs as your starting value*
270 grams
What is the percentage composition of ammonia (NH3)?
82.2% N
17.8% H
How many bones are in the human body?
206 bones
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
What is the mass of 7.21 x 1021 formula units of silver acetate (AgC2H3O2)?
*Write your answer with the same # of sig figs as your starting value*
2.00 grams
Suppose a ring contains 2.30 x 1022 atoms of silver. How many grams of silver would be in the ring?
*Write your answer with the same # of sig figs as your starting value*
Particles --> Moles --> Grams
4.12 grams
Who painted the ceiling of the Sistine Chapel?
Michelangelo