Approximately what amount of $O_{2}$ reaches the tissues via $100 \ ml$ of blood (in $ml$)?

What is the amount of $O_{2}$ supplied to tissues through every $100 \ ml$ of oxygenated blood under normal physiological conditions (in $ml$)?

Haemoglobin $(Hb)$ transports oxygen from the lungs to tissues. The partial pressure of oxygen in the lungs is different from that in the tissues. Each $Hb$ can bind to up to four oxygen molecules. Suppose we have an equal number of $Hb$ and oxygen molecules,and all the oxygen molecules are in a bound form. Then,which of the following is true?

What are $P$ and $Q$ in the given reaction?
$CO _2+ H _2 O \underset{Q}{\stackrel{P}{\rightleftharpoons}} H _2 CO _3 \underset{Q}{\stackrel{P}{\rightleftharpoons}} HCO _3^{-}+ H ^{+}$

Carbon dioxide is transported via blood to the lungs primarily in which form?

The amount of oxygen transported by one litre of blood under strenuous condition is approximately (in $ml$)