Q4) a) Explain why AStusion and ASyaporization are always positive? b) Natural gas is composed of 90% methane (CH4). As a heat source, methane is burned under the stream of O2. This reaction, namely combustion reaction, is given as follows : CHA(8) + 202(g) → CO2(g) +2H20O(I) According to this reaction find out AA°reaction and AG°reaction at 298 K. s° (CO2) = 213.8 J/mol.K ; s° (H2O) = 70.0 J/mol.K ; S° (CH.) = 183.6 J/mol.K ; s° (02) = 205.2 J/mol.K; AH°reaction = -890 kJ/mol. Assume that all reactants and products behave as an ideal gase.

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Q4) a) Explain why AStusion and ASvaporization are always positive?
b) Natural gas is composed of 90% methane (CH4). As a heat source, methane is burned
under the stream of O2. This reaction, namely combustion reaction, is given as follows :
CHa(g) + 202(g) → CO2{g) +2H2O(I)
According to this reaction find out AA°reaction and AG°reaction at 298 K.
S° (CO2) = 213.8 J/mol.K ; S° (H2O) = 70.0 J/mol.K ; S° (CH4) = 183.6 J/mol.K ;
s° (02) = 205.2 J/mol.K; AH°re
reaction = -890 kJ/mol.
Assume that all reactants and products behave as an ideal gase.
Transcribed Image Text:Q4) a) Explain why AStusion and ASvaporization are always positive? b) Natural gas is composed of 90% methane (CH4). As a heat source, methane is burned under the stream of O2. This reaction, namely combustion reaction, is given as follows : CHa(g) + 202(g) → CO2{g) +2H2O(I) According to this reaction find out AA°reaction and AG°reaction at 298 K. S° (CO2) = 213.8 J/mol.K ; S° (H2O) = 70.0 J/mol.K ; S° (CH4) = 183.6 J/mol.K ; s° (02) = 205.2 J/mol.K; AH°re reaction = -890 kJ/mol. Assume that all reactants and products behave as an ideal gase.
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