Question

A calorimeter is filled with 125 g of water at an initial temperature of 20.7 °C. A 243 g sample of solid KOH is added, and the temperature increases to 24.1 °C. Determine the quantity of heat absorbed by the water for this solution process. Determine the molar enthalpy of solution for KOH.

Answer 1

To determine the quantity of heat absorbed by the water for the solution process, use the equation q = mcΔT. To determine the molar enthalpy of solution for KOH, use the equation ΔH = q/n.

Step-by-step explanation:

To determine the quantity of heat absorbed by the water for the solution process, we can use the equation:

q = mcΔT

Where:

q = heat absorbed or released

m = mass of water

c = specific heat capacity of water (4.184 J/g°C)

ΔT = change in temperature

Plugging in the values from the problem, we have:

q = (125 g)(4.184 J/g°C)(24.1°C - 20.7°C)

Solving this equation gives us the quantity of heat absorbed by the water.

To determine the molar enthalpy of solution for KOH, we can use the equation:

ΔH = q/n

Where:

ΔH = molar enthalpy of solution

q = heat absorbed or released

n = number of moles of KOH

We can calculate the number of moles of KOH using its molar mass. Then, plug in the values to solve for the molar enthalpy of solution.