Iron is made when iron(III) oxide is heated with carbon monoxide, as shown by reaction 2 . $$\[ \text { reaction } 2 \quad \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{CO} \rightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_{2} \]$$ Table 4.1 shows enthalpy change of formation data measured at 298 K and 101 kPa . (i) Complete Table 4.1 by adding equations with relevant state symbols to represent: - standard enthalpy change of formation for $$$\mathrm{Fe}_{2} \mathrm{O}_{3}$$$ - standard enthalpy change of formation for CO . (ii) Use the data in Table 4.1 to calculate the enthalpy change of reaction, $$$\Delta H_{\mathrm{r}}$$$, in $$$\mathrm{kJ} \mathrm{mol}^{-1}$$$, for reaction 2 . Show your working. $$\[ \Delta H_{\mathrm{r}}= \]$$ .......................... $$$\mathrm{kJmol}^{-1}$$$

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_21 Year：2024 Question No：4(b)

Answer:

Knowledge points:

5.1.1 understand that chemical reactions are accompanied by enthalpy changes and these changes can be exothermic (ΔH is negative) or endothermic (ΔH is positive)

5.1.2 construct and interpret a reaction pathway diagram, in terms of the enthalpy change of the reaction and of the activation energy

5.1.3.1 standard conditions (this syllabus assumes that these are 298 K and 101 kPa) shown by

5.1.3.2 enthalpy change with particular reference to: reaction, , formation, , combustion, , neutralisation,

5.1.4 understand that energy transfers occur during chemical reactions because of the breaking and making of chemical bonds

5.1.5 use bond energies (ΔH positive, i.e. bond breaking) to calculate enthalpy change of reaction,

5.1.6 understand that some bond energies are exact and some bond energies are averages

5.1.7 calculate enthalpy changes from appropriate experimental results, including the use of the relationships q = mcΔT and ΔH = –mcΔT/n

Answer:

Knowledge points:

Solution:

Related Question