Question

# Which of the following equations corresponds to the enthalpy of combustion at $$298\,K$$?

A
C2H6(g)+7/2O2(g)2CO2(g)+3H2O(g)
B
2C2H6(g)+7O2(g)4CO2(g)+6H2O(g)
C
C2H6(g)+7/2O2(g)2CO2(g)+3H2O(l)
D
2C2H6(g)+7O2(g)4CO2(g)+6H2O(l)

Solution

## The correct option is C $$\,C_2H_6(g) + 7/2O_2(g)\,\,\longrightarrow 2CO_2(g) + 3H_2O(l)$$As we know, combustion of one mole of reactants gives products in standard state or most stable state.$$\,C_2H_6(g) + 7/2O_2(g)\,\,\longrightarrow 2CO_2(g) + 3H_2O(l)$$Chemistry

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