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Chemistry
Quantitive Chemistry
Relative Formula Mass
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Created by
Lily Pratt
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Cards (29)
What should you be able to state by the end of the video?
What is meant by
relative formula mass
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What is the relative atomic mass of an element?
Average mass of
isotopes
weighted by
abundance
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What does the term
abundance
refer to
in
isotopes?
How common an isotope is
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What is the atomic number of chlorine?
17
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How many neutrons does the chlorine isotope with mass number 35 have?
18
neutrons
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How many neutrons does the chlorine isotope with mass number 37 have?
20
neutrons
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What is the average mass number of chlorine as seen on the periodic table?
35.5
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Why is the mass number of chlorine 35.5?
It is weighted for the abundance of
isotopes
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What is the definition of relative formula mass?
Sum of
relative atomic masses
in a formula
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What symbol represents relative formula mass?
It has a specific symbol
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Does relative formula mass have units?
No
, it has
no
units
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Does relative formula mass involve large numbers?
No, it never involves
big numbers
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What is the relative formula mass of methane?
16
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How many carbon and hydrogen atoms are in methane?
1
carbon and
4
hydrogen atoms
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What is the relative atomic mass of carbon?
12
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What is the relative atomic mass of hydrogen?
1
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How do you calculate the relative formula mass of methane?
Add 1 times
12
and
4
times 1
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What happens when you put a large two in front of the formula for methane?
It indicates two
molecules
of methane
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What is the relative formula mass of calcium sulfate?
136
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What is the relative atomic mass of calcium?
40
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What is the relative atomic mass of sulfur?
32
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What is the relative atomic mass of oxygen?
16
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How do you calculate the relative formula mass of calcium sulfate?
Add 1
times
40
, 1 times
32
, and 4 times
16
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What is the relative formula mass of magnesium hydroxide?
58
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What is the relative atomic mass of magnesium?
24
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How do you calculate the relative formula mass of magnesium hydroxide?
Add
1
times
24
, 2 times
16
, and 2 times 1
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What should you remember about relative formula mass?
It has no
units
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What are the key facts about relative formula mass?
No
units
Never involves
big numbers
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What are the steps to calculate the relative formula mass of a compound?
Identify the number of each atom
Multiply by their
relative atomic masses
Sum
all the values
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