How many moles are there in 7 Liters of oxygen gas at STP?

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

If 90.0 grams of ethane reacted with excess chlorine, how many grams of dicarbon hexachloride would form

Find the mass, in grams, of 5.00*10^23 molecules of f2