Helppp what do I put

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

The graph indicates the running route for tobias. which best describes his run? from time 0 to 6, he went fast and then slowed down. from time 6 to 10, he was at his slowest. from time 12 to 14, he went very slow. from time 14 to 18, he went toward the starting point.