Final answer:
When using a bag-mask device, you should deliver approximately 500 milliliters of tidal volume, which is the amount of air inspired and expired during normal breathing.
Step-by-step explanation:
The tidal volume is the amount of air that is inspired and expired during normal breathing. It is approximately 500 milliliters in adults. When using a bag-mask device, you should deliver a tidal volume similar to what would be delivered during normal breathing, which is around 500 milliliters.