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What is law of conservation of mass?...

What is law of conservation of mass?

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This law states that matter can neither be created nor be destroyed. Decomposition of mercuric oxide 100g of mercuric oxide when heated in a closed tube, decomposed to produce 92.6g of a mercury and 7.4g of oxygen gas
`underset(100g)(HgO(s)) rarr underset(92.6g)(Hg(l)) + underset(7.4g)((1)/(2)) O_(2)(g)`
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