What weight in grams of H2 so4 would be needed to make 750 ml of 2.00 molar solution​

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

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes? or no? this question is worth 20 points! let it be correct!

Someone do this for me. im really stuck