<u>Answer:</u> The final temperature is 8.13°C
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
Given mass of NaOH = 13.9 g
Molar mass of NaOH = 40 g/mol
Putting values in above equation, we get:
- To calculate the heat released in the reaction, we use the equation:
where,
= amount of heat released
n = number of moles = 0.35 moles
= enthalpy change of the reaction = -44.4 kJ/mol
Putting values in above equation, we get:
- To calculate the final temperature, we use the equation:
where,
q = heat released = -15.54 kJ = -15540 J (Conversion factor: 1 kJ = 1000 J)
m = mass of water = 250.0 g
c = specific heat capacity of water = 4.18 J/g.K
= initial temperature =
= final temperature = ?
Putting values in above equation, we get:
Converting the temperature from kelvins to degree Celsius, by using the conversion factor:
Hence, the final temperature is 8.13°C