Question

When is the Law of Conservation of Mass not true? I am so confused...

Answer 1

The conservation of mass does not apply if the system is open and energy escapes. However, it does continue to apply to totally closed/isolated systems. Therefore, if energy cannot escape a system then its mass cannot decrease.

Step-by-step explanation:

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Answer 2

When one of the products of the equation is a gas. The gas escapes and isn't weighed and what is left is not the total mass of the system.

Step-by-step explanation:

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