3. 50 ml 50 g) of 1.0 M HCI is mixed with 50 ml 50 g) of 1.0 M NaOH in a calorim

Question

3. 50 ml 50 g) of 1.0 M HCI is mixed with 50 ml 50 g) of 1.0 M NaOH in a calorimeter. The initial temperature of HCI and NaOH is 25.0C. The heat from the reaction is contained in the calorimeter to warm up the mixture, and the final temperature of the solution is 44.0· The specific heat of the solution is 4. 18 J / g , and the calorimeter constant Cakrse"-23. 5 J "c. a. Write the reaction equation. b. How many moles of HCI (or NaOH) are used in the reaction? Calculate the molar reaction heat AH A hot pack contains 100 ml salt solution, and it should reach a maximum of 65°C. A cold pack contains 100 ml salt solution, and it should reach a minimum of 0 . In an experiment, 1 gram NHNO, is dissolved in 30 ml water in a Styrofoam cup. The dissolution causes solution temperature being reduced from 22.5 to 204 (a) Can NH NO; be used as hot pack or cold pack? (b) How many grams of NH NO, are needed for making one pack? 4.

Explanation / Answer

Q3

a)

the reaction is

HCl + NaOH = NaCl + H2O

ratio is 1:1

b)

mol of HCl = MV = (1)(50*10^-3) = 0.05

c)

HRxn = -Qsoln/n

Qsoln = Qwater + Qcal

qsoln = m*C*(Tf-Ti) + CCal*(Tf-Ti) = (100*4.18+23.5)(44-25) = 8388.5 J

HRxn = -8388.5 / 0.05

HRxn = -167770J/mol = -167.7 kJ/mol

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