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.

ChemistryMediumHigh School (11–12)Chemical Thermodynamics › Systems, Work, Heat and the First Law JEE Main

Solid ammonium carbamate breaks down on warming: $\text{NH}_2\text{COONH}_4(s) \rightarrow 2\,\text{NH}_3(g) + \text{CO}_2(g)$ . In a sealed steel vessel of fixed volume at $298\ \text{K}$ , the change takes in $152.4\ \text{kJ}$ of heat for each mole of the solid. What is $\Delta H$ of this change at $298\ \text{K}$ , per mole of the solid? Treat the gases as ideal and take $R = 8.314\ \text{J K}^{-1}\ \text{mol}^{-1}$ .

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← For the 2s orbital of a hydrogen atom, ψ ∝ (2 - r/a₀)e^(-r/2a₀), where a₀ = 52.9 pm. The chance of finding the electron in a thin spherical shell between r and r + dr is proportional to 4π r²ψ² dr. At what distance from the nucleus is this radial probability density largest?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. →

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