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CAIE A-Level Chemistry AS 5.1.7 Enthalpy Changes From Appropriate Experimental Questions

Practise calculating enthalpy changes from calorimetry data and evaluating experimental limitations using CAIE 9701 AS questions and mark schemes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Determine enthalpy changes from appropriate calorimetry experiments and evaluate experimental limitations.

CAIE A-Level Chemistry AS 5.1.7 Enthalpy Changes From Appropriate Experimental Questions question 1

[Maximum number: 1]

The enthalpy change for neutralisation of HNO3(aq)\mathrm{HNO}_{3}(\mathrm{aq}) with NaOH(aq) is −57.0 kJ mol−1-57.0 \mathrm{~kJ} \mathrm{~mol}^{-1}.
In an experiment, 20.0 cm320.0 \mathrm{~cm}^{3} of 4.00moldm−3HNO34.00 \mathrm{moldm}^{-3} \mathrm{HNO}_{3} is mixed with 30.0 cm330.0 \mathrm{~cm}^{3} of 2.00 moldm−3NaOH2.00 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{NaOH} in an insulated container. The initial temperature of both solutions is 25.0∘C25.0^{\circ} \mathrm{C}.

It can be assumed that the heat capacity of the product mixture is 4.2 J cm−3∘C−14.2 \mathrm{~J} \mathrm{~cm}^{-3}{ }^{\circ} \mathrm{C}^{-1} and that there are no heat losses.

What is the maximum final temperature of the mixture?

A

41.3∘C41.3^{\circ} \mathrm{C}

B

44.0∘C44.0^{\circ} \mathrm{C}

C

46.7∘C46.7^{\circ} \mathrm{C}

D

52.1∘C52.1^{\circ} \mathrm{C}

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