0 This is a Mindquestion/It isworth 3 points/You have 5af 5 attemptsrerraining/T

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0 This is a Mindquestion/It isworth 3 points/You have 5af 5 attemptsrerraining/There is a5%attempt penalty See page 236 07 Question (3 points) A 942 ml sample of 1.00 M NaOH is mixed with 47.1 ml of 1.00M H2504 in a large Styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temperature of each solution before mixing is 21.65 'C. After adding the NaOH solution to the coffee cup and stirring the mioed solutions with the thermometer, the maximum temperature measured is 32 90"C Assume that the density ofthe mixed solutions is1.00gin·that the specifc heat of the moedsolutions is 418wg aand that no heat is lost to the surroundina v 1st attempt See Periodic Table Part 1 (1 point) Write a balanced chemical equation for the reaction that takes place in the Styrofoam cup. Remember to include phases in the balanced chemical equation Part 2 (1 point) Is any NaOH or H2504 left in the Styrofoam cup when the reaction is over? Choose one A No See Hint Part 3 (1 point) Calculate the enthalpy change per ole of H2504 nthersaction otr imole o H25oainteersacoon ki mol … { QUESTIONS PLETED MAR

Explanation / Answer

part 1)

balanced chemical equation :

2 NaOH (aq) + H2SO4 (aq)   ----------------> Na2SO4 (aq) + 2 H2O (l)

part 2)

moles of NaOH = 94.2 x 1 / 1000 = 0.0942

moles of H2SO4 = 47.1 x 1 / 1000 = 0.0471

2 NaOH (aq) + H2SO4 (aq)   ----------------> Na2SO4 (aq) + 2 H2O (l)

    2                        1

0.0942                0.0471

Answer : No , any NaOH or H2SO4 not left

part 3)

mass of solution = 94.2 + 47.1 = 141.3 g

Q = m Cp dT

= 141.3 x 4.184 x (32.90 - 21.65)

= 6651 J

delta H = - Q / n

            = - 6651 x 10^-3 / 0.0471

delta H = - 141.2 kJ/mol

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