If 77.5 g NH3 reacts with excess O2, what volume of NO is produced at STP?

How many moles of al3+ ions are in 1.25 moles of al2o3

Is a pencil falling to the floor anon contact force, a force, or a contact force

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.