#1. a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places is called a reaction.
#2. the is the amount of one material present in a given volume of another material.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.

the maximum mass of nh3 is nh3 in grams