The patient is retaining CO2 (normal pCO2 is 40)so based on the limited information available (You did not give the entire blood gas results) - it seems like the patient is not doing well.
The PO2 is OK - at 100, however it is taking 100% O2 to obtain that level. Room air contains 21% Oxygen
You asked for a scale of 1-10 I would say 3 or 4 at best.
As for the Hemoglobin - this is low at 7.5 with low normal about 13.5. I would give this also about a 3 on a scale of 1-10.
Based on the limited information available: Diagnosis of advanced stage lung cancer, being on a ventilator at 100% O2, the lab results - this patient is not doing well.
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