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a) Predict whether entropy increases or ...

a) Predict whether entropy increases or decreases in the following changes:
i) `l_2(S)rightarrowl_2(g)`
ii) Temperature of a crystalline solid is raised from 0 K and 115 K.
iii) Freezing of water
b) Calculate the enthalpy of combustion of methane. Given that standard enthalpies of formation of `CH_4,CO_2` and `H_2O` are `-75.2, -394` and `-285.6` kJ/mol respectively.

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Internal energy, enthalpy and entropy are thermodynamics state functions. Calculate enthalpy of combustion of methane, given that the standard enthalpies of formation of CH_4 , CO_2 and H_2O are -75.2, -394.0 and -285.6 kJ//mol respectively.

Calculate the standard enthalpy change for the reaction CH_4(g) +2O_2(g) rarr CO_2(g)+2H_2O(l) Given that the standard enthalpies of formation of CH_4(g),CO_2(g), and H_2O(l) are -74.8 kJ mol^-1, -393.5 kJ mol^-1 and -285.8 kJ mol^-1 respectively.

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Calculate the molecular mass of the following. (i) H_2O (ii) CO_2 (iii) CH_4

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Predict in which of the following, entropy increases:(iii) 2NaHCO_3(s)rarrNa_2CO_3(s)+CO_2(g)+H_2O(g) .

The standard enthalpies of formation of H_(2)O(l) and CO_(2)(g) are respectively -286" kJ mol"^(-1) and -394" kJ mol"^(-1) . If the standard heat of combustion of CH_(4)(g)" is "-891" kJ mol"^(-1) , then the standard enthalpy of formation of CH_(4)(g) is

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