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1-8 Describe the law of conservation of matter,(mass).
1-8-1. A compound decomposes (breaks apart) into elements "X" and "Y". If the decomposition of 5.0 g of the compound produces 2.0 g of element "X", how much of element "Y" is also produced?
A. 2.0 g, B. 3.0 g, C. 5.0 g, D. impossible to tell
