9-28-10 - Lecture 2 - Chapter2

# 9-28-10 - Lecture 2 - Chapter2 - Law of Mass Conservation...

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In a Chemical Reaction : The number of substances may change and their properties will change but the total amount of matter remains constant. reactant 1 + reactant 2 product total mass total mass = calcium oxide + carbon dioxide calcium carbonate CaO + CO 2 CaCO 3 56.08 g + 44.01 g 100.09 g (Symbols) (Words) (Quantities) Law of Mass Conservation

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Law of Definite Composition No matter the source, a particular compound is composed of the same elements in the same parts (fractions) by mass. Calcium carbonate, CaCO 3 Analysis by Mass Analysis by Mass (grams/20.0 g) (grams/20.0 g) Mass Fraction Mass Fraction (parts/1.00 part) (parts/1.00 part) Percent by Mass Percent by Mass (parts/100 parts) (parts/100 parts) 8.0 g calcium 8.0 g calcium 2.4 g carbon 2.4 g carbon 9.6 g oxygen 9.6 g oxygen 20.0 g 20.0 g 40% calcium 40% calcium 12% carbon 12% carbon 48% oxygen 48% oxygen 100% by mass 100% by mass 0.40 calcium 0.40 calcium 0.12 carbon 0.12 carbon 0.48 oxygen 0.48 oxygen 1.00 part by mass Figure 2.2
If elements A and B react to form two compounds, the different

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