The standard enthalpies of formation are C₂H₄(g) +52.3 kJ mol⁻¹, CO₂(g) -393.5 kJ mol⁻¹ and H₂O(l) -285.8 kJ mol⁻¹. Ethene burns completely in oxygen to carbon dioxide and liquid water. What is the size of its standard enthalpy of combustion, in kJ mol⁻¹? Give the value without its sign, to the nearest integer.

ChemistryMediumHigh School (11–12)Chemical Thermodynamics › Enthalpy and Hess's Law JEE Main

The standard enthalpies of formation are $\text{C}_2\text{H}_4(g)$ $+52.3\ \text{kJ mol}^{-1}$ , $\text{CO}_2(g)$ $-393.5\ \text{kJ mol}^{-1}$ and $\text{H}_2\text{O}(l)$ $-285.8\ \text{kJ mol}^{-1}$ . Ethene burns completely in oxygen to carbon dioxide and liquid water. What is the size of its standard enthalpy of combustion, in $\text{kJ mol}^{-1}$ ? Give the value without its sign, to the nearest integer.

Type your answer as a number (a decimal point is allowed). A wrong answer may cost marks.

← All Quizzes

← Solid ammonium carbamate breaks down on warming: NH₂COONH₄(s) → 2 NH₃(g) + CO₂(g). In a sealed steel vessel of fixed volume at 298 K, the change takes in 152.4 kJ of heat for each mole of the solid. What is Δ H of this change at 298 K, per mole of the solid? Treat the gases as ideal and take R = 8.314 J K⁻¹ mol⁻¹.A rigid, insulated flask of volume 4.0 L holds 0.50 mol of an ideal gas at 300 K. It is joined by a tap to a second rigid, insulated flask of volume 6.0 L that is empty. The tap is opened and the gas spreads through both flasks. Which statement about this change is correct? (w is the work done on the gas; take R = 8.314 J K⁻¹ mol⁻¹.) →

More onChemical Thermodynamics › Enthalpy and Hess's Law

Discussion (0)

Loading…

Discussion (0)

Problems on this topic