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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.
The balance between oxygen uptake by the body tissues and oxygen delivery to them is assessed by: The oxygen content of mixed venous blood CvO2, which is normally about 15 ml/100 ml. The extraction ratio, which is the ratio of VO2 to DO2 expressed as a percentage. Normally the extraction ratio is about 25% but can double to 50% if tissue demand increases.