How many moles are in 56.7g of Fe?

Did the detergents containing enzymes work better at removing stains than those containing no enzyme? why or why not?

Amechanical wave that transports a lot of energy will have a

What is the pressure of 5.0 mol nitrogen gas in a 2.0 l container at 268 k (the universal gas constant is 0.0821 l•atm/mol•k) a. 55 atm b. 8.8 atm c. 0.018 atm d. 220 atm