Answer:
A pure substance consists of a single element or compound. Iron is formed only of iron (Fe) atoms; table salt is formed only by sodium chloride (NaCl) molecules. A mixture, however, is made up of different compounds and/or elements.
Explanation:
This is true they are defined as protons
If those 'x's' mean times, then your answer should be 0.01742919.
159.69g⋅5=798.45g that is the correct answer