PYQ Vault
EbooksTutor

Heat for a given mass of substance from a thermochemical equation

This type of question, asked 4 times: 11 May 2023 S2, 10 May 2024 S2, 12 May 2024 S1, 16 Apr 2026 S2. All 5 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    11 May 2023 S2

    91
    Calculate the enthalpy change when 12 g carbon react with sufficient hydrogen to form methane. If enthalpy of formation of methane is −75 kJ mol−1-75\ \text{kJ mol}^{-1}.

    Tap an option to check your answer.

  2. Question 2

    10 May 2024 S2

    68
    If 8.84 kJ heat is liberated for formation of 3 g ethane, calculate its ΔrH∘\Delta_r H^\circ.

    Tap an option to check your answer.

  3. Question 3

    12 May 2024 S1

    69
    Calculate amount of methane formed by liberation of 149.6 kJ of heat using following equation: C(s)+2H2(g)→CH4(g) ΔH=−74.8 kJ/mol\text{C}_{(s)}+2\text{H}_{2(g)}\rightarrow\text{CH}_{4(g)}\,\Delta H=-74.8\,\text{kJ/mol}

    Tap an option to check your answer.

  4. Question 4

    16 Apr 2026 S2

    7
    The heat of combustion of carbon to CO2\mathrm{CO_2} is −393.5-393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2\mathrm{CO_2} from carbon and oxygen gas is

    Tap an option to check your answer.

  5. Question 5

    16 Apr 2026 S2

    8
    Calculate the enthalpy change when 6 g. CO(g) reacts with sufficient NO2(g)\mathrm{NO_2(g)} according to the following reaction 4CO(g)+2NO2(g)→4CO2(g)+2N2(g); ΔrH0=−1200\mathrm{4CO(g) + 2NO_2(g) \rightarrow 4CO_2(g) + 2N_2(g)};\ \Delta_r H^0 = -1200 kJ

    Tap an option to check your answer.