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1) That looks right. 2) Step 1: Moles=Mass/Mr, so it's 144/72= 2mol. Step 2: Stoichiometry means the ratio of oxygen to pentane is 1:8 so moles of oxygen is moles of pentane times 8. 2*8=16mol of oxygen. Step 3: 16= 9.6*10^24. 3) The ratio of oxygen to carbon in CO2 is 1:2. so it's 192/3 = 64.
1 PaO2/FiO2 ratio is the ratio of arterial oxygen partial pressure to fractional inspired oxygen. 2  aka the Carrico index and the PF ratio.3  it is a widely used clinical indicator of hypoxaemia, though its diagnostic utility is disputed. PaO2/FiO2 ratio is the ratio of arterial oxygen partial pressure to fractional inspired oxygen. 2  aka the Carrico index and the PF ratio.