PPT Slide

Definite Composition

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• A particular chemical compound is always composed of  the same elements in the same parts (fractions) by mass.

• Consider calcium carbonate; results obtained for the  elemental mass composition of 20.0 g calcium carbonate:

ANALYSIS BY MASS MASS FRACTION PERCENT BY MASS

(grams/20.0 g) (parts/1.00 part) (parts/100 parts) 8.0 g calcium 0.40 calcium 40% calcium  2.4 g carbon 0.12 carbon 12% carbon 9.6 g oxygen 0.48 oxygen 48% oxygen 20.0 g 1.00 part by mass 100% by mass

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