what amount of ammonia and Sulphuric acid is required to form 33g Ammonium Sulphate (n = 14 h = 1 s= 32 o=16)​

The stopwatch used by a student to measure velocity of a pulse in a slinky was of least count 0.1 second. he stops the stopwatch when a pulse has made 3 journeys from one end to the other of the slinky. he finds the seconds hand to be at 52nd division. calculate the correct time noted by him.