The following H2 chemisorptions

The following H2 chemisorptions results are reported for a 1.5% Rh/Al2O3 catalyst. What is the amount of hydrogen chemisorbed on Rh? What is the dispersion (fraction exposed) of the Rh?
H2 pressure (Torr) H2 Uptake (μmole=g catalyst)
50 ___________ 40.0
75 ___________ 50.0
100 ___________ 60.0
150 ___________ 65.0
200 ___________ 70.0
250 ___________ 75.0
300 ___________ 80.0
350 ___________ 85.0
400 ___________ 90.0
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