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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_____________________________________________________________ _____________________________________________________________________________________________ _ _____________________________________________________________________________________________ _ 4. How many grams of carbon are in 30.0 g of sucrose? Show your work. __________________12.66_______________________________________________________________________ __ _____________________________________________________________________________________________ _ _____________________________________________________________________________________________ _ 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