Answer:
Ammonia is the richest source of nitrogen on a mass percentage basis because it has 82.35% of nitrogen by mass.
Explanation:
Percentage of element in compound :
(a) Urea, 
Molar mass of urea = 60 g/mol
Atomic mass of nitrogen = 14 g/mol
Number of nitrogen atoms = 2
(b) Ammonium nitrate, 
Molar mass of ammonium nitrate = 80 g/mol
Atomic mass of nitrogen = 14 g/mol
Number of nitrogen atoms = 2
(c) Nitric oxide, NO
Molar mass of nitric oxide = 30 g/mol
Atomic mass of nitrogen = 14 g/mol
Number of nitrogen atoms = 1
(d) Ammonia, 
Molar mass of ammona = 17 g/mol
Atomic mass of nitrogen = 14 g/mol
Number of nitrogen atoms = 1
Ammonia is the richest source of nitrogen on a mass percentage basis because it has 82.35% of nitrogen by mass.
Atomic Number. It represents the number of protons in an atom of a particular element, which is what identifies that particular element. If the number of protons is different, the element is different.
Answer:
The correct answer is: “The Roman army grew in size and became dominant in the Mediterranean region”.
Explanation:
The Punic wars were a series of three wars that were fought between Rome and Carthage. At the end of the third war, Rome established itself as an empire, it conquered the Carthage’s empire, destroyed it completely and became the most powerful state of the Western Mediterranean.
Beta decay occurs when a neutron transforms into a proton, an electron(and an electron anti-neutrino) Even though there are less electrostatically-repelling protons in C 14 than in N 14 the extra neutrons make the nucleus less stable than that of N 14
