Answer: D.atomic mass.
Explanation: The general representation of an element is given by: 
X = chemical symbol of element
Z= atomic number= which represents the number of electrons.
A= mass number or atomic mass =which represents the number of electrons + number of neutrons
Thus mass number is greater than number of electrons and number of neutrons as it is the sum of both.
7.2 / 2.4 = 3 half-lives
(1/2)3 = 0.125 (the amount remaining after 3 half-lives)
100.0 g x 0.125 = 12.5 g remaining
To put it simply we ca do the next procedure
<span>12 E21/6E23 * 201 = 2 E-2 * 201 = 4.02 g
</span>Remember please that <span>Hg has two hundred.fifty 9 grams now weight of 6.022*10^23 atoms weigh two hundred.fifty 9 grams now remedy for a million.Then we do the procedure i showed you at the beginning an in that way you will have the result of 4.02g</span>
Answer:
The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).
