Sample information Excel sheet attached below.

Images 1-6: Si-29 sample

Images 6-10: Si-28 sample

Image 11: screenshot from Excel sheet for Si-29

Image 12: screenshot from Excel sheet for Si-28

Image 13: screenshot from Excel sheet for Dummy

Both samples were only able to be weighed inside the capsule as they were very crumbly and unable to be weighed alone (see images). The capsule was weighed before the sample was put in it and thus the mass of Si can be found by subtracting the capsule mass from the measured mass.

Average mass Si-29: 0.8568g pm 0.0002

Average mass Si-28: 0.9551 pm 0.0002

Average mass Dummy: 0.0765 pm 0.0001