Answer:
[tex]q = 0.810[/tex] Kj/mol
Its an endothermic reaction
Explanation:
Enthalpy can be evaluated by using following formula -
[tex]q = m * c* \delta T[/tex]
where
q is the enthalpy or change in internal energy
m is the mass in kg
c is the specific heat
and [tex]\delta T[/tex] is the change in temperature
Mass of HCl is equal to [tex]36.46[/tex] g/mol
or
Mass of HCl is equal to [tex]0.03646[/tex] Kg/mol
Substituting the given values in above equation, we get-
[tex]q = 0.03646 * 4.04 * (42.5 - 37)\\q = 0.03646 * 4.04 * 5.5 \\[/tex]
[tex]q = 0.810[/tex] Kj/mol
Enthalpy is positive thus it is an endothermic reaction
