Answer:
There is 1.3 kJ heat produced(released)
Explanation:
<u>Step 1:</u> Data given
Volume of a 0.200 M Nacl solution = 100 mL = 0.1 L
Volume of a 0.200 M AgNO3 solution = 100 mL = 0.1 L
Initial temperature = 21.9 °C
Final temperature = 23.5 °C
Solid AgCl will be formed
<u>Step 2</u>: The balanced equation:
AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
AgCl(s) + NaNO3(aq) → Na+(aq) + NO3-(aq) + AgCl(s)
<u>Step 3:</u> Define the formula
Pressure is constant. → the heat evolved from the reaction is equivalent to the enthalpy of reaction.
Q=m*c*ΔT
⇒ Q = the heat transfer (in joule)
⇒ m =the mass (in grams)
⇒ c= the heat capacity (J/g°C)
⇒ ΔT = Change in temperature = T2- T1
Step 4: Calculate heat
Let's vonsider the density the same as the density of water (1g/mL)
Mass = volume * density
Mass = 200 mL * 1g/mL
Mass = 200 grams
Q= m*c*ΔT
⇒ m = 200 grams
⇒ c = the heat capacity (let's consider the heat capacity of water) = 4.184 J/g°C
⇒ ΔT = 23.5 -21.9 = 1.6°C
Q = 200 * 4.184 * 1.6 = 1338 .9 J = 1.3 kJ
There is 1.3 kJ heat produced(released)
Therefore, we assumed no heat is absorbed by the calorimeter, no heat is exchanged between the calorimeter and its surroundings, and the specific heat and mass of the solution are the same as those for water (1g/mL and 4.184 J/g°C)
