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Posted by on Sunday, April 22, 2007 at 7:52pm.

A sample of water decomposes to make 4g of hydrogen gas and 32g of oxygen gas. What mass of water decomposed? How do you know?

Hint: The water decomposes into ONLY hydrogen and oxygen, and the total mass does not change in the process.

It's called the Law of Conservation of Mass.

  • Science - , Wednesday, December 2, 2015 at 1:43pm


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