Use the following information to predict H for the reaction: HClO4(aq) + NaOH(aq
ID: 103482 • Letter: U
Question
Use the following information to predict H for the reaction: HClO4(aq) + NaOH(aq) NaClO4(aq) + H2O(l) Solution Mass (g) Volume (ml) Molarity (mol/L) Initial Temperature (°C) HClO4(aq) 51.99 51.98 0.500 25.42 NaOH(aq) 51.49 51.48 0.500 25.42 The HClO4(aq) solution was poured into a calorimeter with a heat capacity of 115 J/C, and allowed to sit for about 5 minutes. The NaOH(aq) solution was then added, and the temperature rose to 28.16°C. The heat absorbed by the solution/water is _______ J. If we assume that the temperature change of the calorimeter is the same as the temperature change of the solution it contains, the heat absorbed by the calorimeter is _________ J. The heat of the reaction is ______ J. There are ______ moles of limiting reactant, so H for the reaction is_________ kJ.
Explanation / Answer
a.
Q = m*C*(Tf-Ti)
m = totla mass = 51.99 g + 51.49 = 103.48
C = 4.184
Tf = 28.16; Ti = 25.42°
Q = (103.48*4.184)(28.16-25.42) = 1186.3 J
Qrxn = -Qsolution = -1186.3
b)
mol of rxn = mol of HClO4 = MV = 0.500 *51.49 *10^-3 = 0.025745mol
c)
HRXN = QRxn/0.025745 = -1186.3 / 0.025745 = -46078.8J /mol = -46.08 kJ/mol
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.