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7. If the gases cannot escape, what happens to the total mass of the system?
• It increases
• It decreases
• It stays the same
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Answer: It stays the same.
Explanation: If gases cannot escape the container, the system is closed, so no matter enters or leaves. Chemical reactions or phase changes inside only rearrange atoms and molecules; they do not change the total amount of matter. By the law of conservation of mass (for ordinary chemical processes) the total mass before and after remains constant. (Only nuclear reactions or mass–energy conversion would give a measurable change in mass.)
Explanation: If gases cannot escape the container, the system is closed, so no matter enters or leaves. Chemical reactions or phase changes inside only rearrange atoms and molecules; they do not change the total amount of matter. By the law of conservation of mass (for ordinary chemical processes) the total mass before and after remains constant. (Only nuclear reactions or mass–energy conversion would give a measurable change in mass.)
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