The experiment is repeated with an eggshell sample, and the experimental data are recorded in the ta — Stoichiometry Chemistry Question

The experiment is repeated with an eggshell sample, and the experimental data are recorded in the table below.

[VISUAL]

Mass of eggshell sample: 0.200 g
Pressure prior to reaction: 0.800 atm
Pressure at completion of reaction: 0.870 atm

Using the calibration line [VISUAL], the mass percent of CaCO₃(s) in the eggshell sample is closest to