Name___________________________________________ Date ____________________ Class______________________
MATH SKILLS TRANSPARENCY 3
Use with
Chapter 3,
Finding Percent by Mass
Section 3.4
Chemistry: Matter and Change 1 Math Skills Transparency
Name___________________________________________ Date ____________________ Class______________________
MATH SKILLS TRANSPARENCY 3
Use with
Chapter 3,
Finding Percent by Mass
Section 3.4
1. What percentage of the 20.0 g sample does sugar (sucrose) represent? _______All______________________
2. What is the percent by mass of oxygen in sugar? Of carbon? Of hydrogen?
___________carbon 42.2 % oxygen 51.3 % hydrogen 6.5
%____________________________________________________________
3. How many grams of oxygen are in 100 g of sucrose?
_____________________ 51.3 grams_____________________________________________________________
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4. How many grams of carbon are in 30.0 g of sucrose? Show your work.
__________________12.66_______________________________________________________________________
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_____________________________________________________________________________________________
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5. A sample of baking soda contains 34.48 g of sodium, 1.51 g of hydrogen, 18.02 g of carbon,
and 72.00 g of oxygen.
a. What is the total mass of the sample?
______________________126.01___________________________________________________________________
b. What is the mass by percent of each element in baking soda?
Sodium _________27.4%__
Hydrogen ________1.198%___________
Carbon ___________14.3%__________
Oxygen _________57.138%___________
6. Draw a circle graph to represent your answer to Question 7.
You grab a whole and divide it by the part then multiply by 100
7. Complete the following statement by underlining the correct words in parentheses.
To calculate percent by mass, first divide (a part, a whole) by (a part, the whole).
Then multiply by 100%.
Chemistry: Matter and Change 2 Math Skills Transparency Worksheet
TEACHER GUIDE AND ANSWERS
Math Skills Transparency 3 – Finding Percent
by Mass
Chemistry: Matter and Change 3 Teacher Guide and Answers