Argon-40 because it is the isotope with the closest mass to the atomic mass of the element. Making it more stable than the others allowing it to be the most abundant in nature.
Answer:
Kj/mol
Its an endothermic reaction
Explanation:
Enthalpy can be evaluated by using following formula -
where
q is the enthalpy or change in internal energy
m is the mass in kg
c is the specific heat
and 
is the change in temperature
Mass of HCl is equal to 
g/mol
or
Mass of HCl is equal to 
Kg/mol
Substituting the given values in above equation, we get-
Kj/mol
Enthalpy is positive thus it is an endothermic reaction
Answer:
<em>Why does metal reactivity increase as you move from right to left on the periodic table? That is why as you go up a group Chemical Reactivity increases </em>
<h3><u>because it is easier for elements to gain electrons when they have high electronegativity.</u></h3>
answer: its rate i might be wrong but i'm positively sure its right
Answer:
Explanation:
When a light ray strikes the interface between two mediums, it is refracted through an angle that depends on the index of refraction of each material and the ray's angle of incidence, as measured relative to the normal (perpendicular) between the surfaces.
