<u>Answer:</u> The amount of heat absorbed by the solution is 56.98 kJ
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:
.....(1)
- <u>For Barium hydroxide:</u>
Molarity of barium hydroxide solution = 0.310 M
Volume of solution = 70 mL = 0.070 L (Conversion factor: 1 L = 1000 mL)
Putting values in equation 1, we get:
Molarity of HCl solution = 0.620 M
Volume of solution = 70 mL = 0.070 L
Putting values in equation 1, we get:
The chemical equation for the reaction of NaOH and sulfuric acid follows:
By Stoichiometry of the reaction:
2 moles of HCl produces 2 moles of water
So, 0.0434 moles of HCl will produce = of water
- To calculate the mass of solution, we use the equation:
Density of solution = 1 g/mL
Volume of solution = [70 + 70] = 140 mL
Putting values in above equation, we get:
- To calculate the amount of heat absorbed, we use the equation:
where,
q = heat absorbed
m = mass of solution = 140 g
c = heat capacity of solution= 4.186 J/g°C
= change in temperature =
Putting values in above equation, we get:
To calculate the enthalpy change of the reaction, we use the equation:
where,
q = amount of heat absorbed = 2.473 kJ
n = number of moles of water = 0.0434 moles
= enthalpy change of the reaction
Putting values in above equation, we get:
Hence, the amount of heat absorbed by the solution is 56.98 kJ