Please help me with this

Working with si (metric) units for each of the following commonly used measurements, indicate its symbol. liter gram milliliter kilogram meter centigram milligram centimeter kilometer second millimeter milliseconds

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

Aman applies a force of 500n to push a truck 100m down the street how much does he do?