In order to predict whether or not a single replacement reaction takes place you need to consult a chart that shows the

Activity series of metals. it is a series of metals based on their reactivity from highest to lowest. Potassium occupies the top most level of reactivity. The reactivity means the ability to displace hydrogen gas from water and acid solutions.

Answer : The enthalpy change during the reaction is 4.74 kJ/mole

Explanation :

First we have to calculate the heat released during the reaction.

where,

q = heat released = ?

= specific heat of water =

m = mass of water = 367 g

= final temperature of water =

= initial temperature of metal =

Now put all the given values in the above formula, we get:

Thus, the heat released during the reaction = 96.6 kJ

Now we have to calculate the enthalpy change during the reaction.

where,

= enthalpy change = ?

q = heat released = 96.6 kJ

n = number of moles water =

Therefore, the enthalpy change during the reaction is 4.74 kJ/mole