09 Question (3 points) a See page 393 A 91.2 ml samole of 1.00 M NaOH i passes a
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09 Question (3 points) a See page 393 A 91.2 ml samole of 1.00 M NaOH i passes a callbrated thermometer. The temperature of each solution before miing is 21.85 C. After adding the Nao solution to the ooffee cup and stirring the mised solutions with the thermometer,the maximurns temperature measured is 30.50 "C. Assume that the derbity of the mised solutions is 00 /m, that the specilfic heat of the mixed solutions is 4.18Cand that no heat is lost to the surroundings s mixed with 4S6 mL of 1.00MH,SO, in a lange Styrofoam coffee cup: the cup is fitted with a lild through which 4th attempt Part 1 (1point) See Periodic Table Write a balanced chemical equation for the reaction thot takes place in the Styrofoam cup Remember to include phases n the balance chemical equation Part 2 (1point Is any NaOH or H,SO,left in the Styrofoam cup when the reactionsover Choose one B.No Part 3 (1 point O See Hint Calculate the enthalpy change per mole of H,SO, in the reaction kJ/molExplanation / Answer
part 1
2NaOH(aq) + H2SO4(aq) ----> Na2SO4(aq) + 2H2O(l)
2 mol NaOH = 1 mol H2SO4
Part 2
no of mol of naOH = 91.2*1/1000 = 0.0912 mol
no of mol of H2SO4 = 45.6*1/1000 = 0.0456 mol
answer: B.NO
part 3
heat released(q) = m*s*DT
m = mass of solution = 91.2+45.6 = 136.8 g
s = specific heat of solution = 4.184 j/g.c
DT = 30.5 - 21.85 = 8.65
q = 136.8*4.184*8.65
= 4.951 Kjoule
dHrxn per mol of H2SO4 = - q/n = -4.951/0.0456 = -108.57 kj/mol
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