Approximately how many $mL$ of $CO_2$ is delivered to the alveoli by every $100$ $mL$ of deoxygenated blood?

Which of the following factors is favourable for the formation of oxyhaemoglobin in the alveoli of human lungs?

People living at sea level have around $5 \; million$ $RBCs$ per cubic millimetre of their blood,whereas those living at an altitude of $5400 \; m$ have around $8 \; million$. This is because at high altitude:

$A$: Human blood always contains a higher amount of $CO_2$ than $O_2$.
$R$: The solubility coefficient of $CO_2$ is higher than that of $O_2$.

Which of the following combines irreversibly with blood haemoglobin?

What is the effect of $pCO_{2}$ on oxygen transport?