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A student burns 10 g of ethanol in an open beaker. After the reaction, no residue is left in the beaker. Does this mean the Law of Conservation of Mass is violated? Explain.

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Question

A student burns 10 g of ethanol in an open beaker. After the reaction, no residue is left in the beaker. Does this mean the Law of Conservation of Mass is violated? Explain.

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Solution

No. Ethanol burns to form gaseous products, including carbon dioxide and water vapour, which escape from the open beaker. The total mass is conserved when these products are included.

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Chapter 9: Atomic Foundations of Matter - Intext Questions [Page 166]

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NCERT Science Exploration [English] Class 9
Chapter 9 Atomic Foundations of Matter
Intext Questions | Q 1. | Page 166
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