How many moles of sodium chloride are in a 321.8 g sample?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

What layer of the atmosphere is directly above the troposphere?

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle