Answer:
-588.1168
Step-by-step explanation:
To calculate the heat of reaction (qrxn), we need to use the formula:
qrxn = -(4.184 x msolution x ΔT)
Given:
Initial temperature (T1) = 25.0°C
Final temperature (T2) = 26.4°C
Mass of cesium hydroxide (m1) = 1.2 g
Mass of water (m2) = 100.0 g
First, let's calculate the sum of the masses of cesium hydroxide and water (msolution):
msolution = m1 + m2
msolution = 1.2 g + 100.0 g
msolution = 101.2 g
Next, let's calculate the change in temperature (ΔT):
ΔT = T2 - T1
ΔT = 26.4°C - 25.0°C
ΔT = 1.4°C
Now, we can substitute the values into the formula to calculate the heat of reaction (qrxn):
qrxn = -(4.184 x msolution x ΔT)
qrxn = -(4.184 x 101.2 g x 1.4°C)
qrxn = -588.1168 J(joule may not be included)
Therefore, the heat of reaction (qrxn) after the compound is completely dissolved is approximately -588.12 J. Note that the negative sign indicates an exothermic reaction, meaning heat is released.