pq0-ans - Pop Quiz Number 0 Chemistry 122 Dr Mathews First...

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Unformatted text preview: Pop Quiz Number 0 Chemistry 122, Dr. Mathews First Week, WI, 2005 Name_______________________________________________________________ Lab Instructor:________________________________________________________ 1. The average speed of a nitrogen molecule in air at 25 o C is 515 m/s. Convert this speed to miles per hour. Recall that 1 hr = 60 min, 1 mi = 1.6093 km, 1 km = 10 3 m, 1 min = 60 s. 515 1 10 1 16093 60 1 60 1 60 1 515 60 60 10 16093 1152 115 10 3 3 3 m s km s mi km s s hr mi hr x mi hr F H G I K J F H G I K J F H G I K J F H G I K J F H G I K J = F H G I K J = = . m i n m i n min ( )( )( ) ( ) ( . ) / . / 2. Use the following unbalanced equation (careful!) to determine the number of water molecules resulting from the complete reaction of 1.00 mole of N 2 O 4 . Recall that Avogadro’s number is 6.02 x 10 23 . 2 N 2 H 4 + 1 N 2 O 4 ö 4 H 2 O + 3 N 2 100 4 1 6 02 10 1 4 6 02 10 2 10 2 4 2 2 4 23 2 2 23 2 24 2 ....
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