Is the sample at constant mass? (chemical calculation)

Question

A student working on this lab found the mass of their sample after the first heating to be 30.6057 g. The student heated the sample again for 5 minutes, cooled it, and then found the mass of the sample to be 30.5757 g. Is the sample at constant mass?

How to solve this calculation?

Answer 1

You wouldn't know if it's at constant mass until you heat it and mass it again. If you heat it again and the mass is still very close to 30.6057g, you could say it's at constant mass because it's not losing mass anymore.