An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct?
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The standard enthalpy of formation (ΔfH°) at 298 K for methane, CH4(g), is –74.8 kJ mol–1. The additional information required to determine the average energy for C–H bond formation would be |
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Based on the first law of thermodynamics, which one of the following is correct? |
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Entropy of the universe is |
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The amount of heat evolved when 500 cm3 of 0.1 M HCl is mixed with 200 cm3 of 0.2 M NaOH is ______. |
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Identify the correct statement from the following in a chemical reaction. |
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The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0°C is |
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The species which by definition has ZERO standard molar enthalpy of formation at 298 K is |
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One mole of which of the following has the highest entropy? |
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Consider the reaction : 4NO2(g) + O2(g) ⟶ 2N2O5(g), ΔrH = –111 kJ. If N2O5(s) is formed instead of N2O5(g) in the above reaction, the ΔrH value will be: |
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For a particular reversible reaction at temperature T, ΔH and ΔS were found to be both +ve. If Te is the temperature at equilibrium, the reaction would be spontaneous when |
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