Name: _________________
Period: _________________
Molar Mass Conversions Guided Notes
Review:
1.
Chemical formulas tell us which _____________ are in a molecule and how many of each atom/element there are. a.
Ex . The molecule CCl
4
contains ______ carbon atoms and _____ chlorine atoms.
2.
The molar mass is used to express the amount of ____________ for one
______________ of a substance. It is often expressed in the units g/mol .
3.
To find the molar mass of an element, we must look at the _______________________.
The atomic mass (usually listed below an element) will tell us the molar mass.

Ex. The molar mass of the element Aluminum is ___________ g/mol.
This means there are _______ grams for every _______ mole of Aluminum.
Molar mass of molecules
1.
To find the molar mass of molecules, we simply total the molar masses of each individual atom/element. Please use the molecule CH
4
for the table below.
Element Molar Mass (g/mol) How Many Total molar masses
+
Molar mass of CH
4
_________________
Molar mass unit conversions
1.
How many grams of carbon dioxide are present in 2 moles of CO
2
?
Always start with what you’re given
(include units)
Element
Units you want go on top, units you start with, on bottom
We need to find the molar mass to determine what numbers go in the parentheses
Molar Mass (g/mol) How Many
Final answer should have desired units
Total molar masses

Name: _________________
Period: _________________
+
Molar mass of CO
2
________________
This means that 1 mole CO
2
= ______ g CO
2
2.
How many moles of CH
3
F are present in a 68 grams of CH
3
F ?
Always start with what you’re given
(include units)
Units you want go on top, units you start with, on bottom
We need to find the molar mass to determine what numbers go in the parentheses
Final answer should have desired units
Element Molar Mass (g/mol) How Many Total molar masses
+
Molar mass of CH
3
F ________________
This means that 1 mole CH
3
F = ______ g CH
3
F
Additional Practice ( you may need a separate paper)
1.
How many grams of oxygen are present in 3 moles of O
2
gas?
2.
How many moles are present in 68 grams of ammonia (NH
3
) ?
3.
How many grams are in 2 moles of CH
2
Br
2
?

Name: _________________
Period: _________________