Because subatomic particles ARE what make up atoms.
I'd say the answer is D because they need to intake and keep as much water as possible.
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