ChemistryMediumHigh School (11–12)Chemical Thermodynamics › Systems, Work, Heat and the First LawJEE Main
Created by StemPy LabA rigid, insulated flask of volume holds of an ideal gas at . It is joined by a tap to a second rigid, insulated flask of volume that is empty. The tap is opened and the gas spreads through both flasks. Which statement about this change is correct? ( is the work done on the gas; take .)
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← 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.Silver oxide decomposes on heating: 2 Ag₂O(s) → 4 Ag(s) + O₂(g). The standard enthalpy of formation of Ag₂O(s) is -31.05 kJ mol⁻¹. The standard molar entropies are Ag(s) 42.55, O₂(g) 205.1 and Ag₂O(s) 121.3 J K⁻¹ mol⁻¹. Taking Δ H° and Δ S° as constant, above what temperature is the decomposition spontaneous under standard conditions? →
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