After a brief stay at a friends house you find you have fleas. you remove 190 adult fleas. if the average adult flea weighs 0.45 mg how many pounds of fleas have you removed?

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

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

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8