Q.

Which of the following statement about thermochemistry is false?

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a

Heat of combustion is experimentally determined using bomb calorimeter

b

Enthalpy of formation of intermediate compounds is calculated applying Hess law

c

A thermochemical equation must be balanced using fractions only

d

Physical states of reactants and products must be mentioned while writing a thermochemical equation

answer is C.

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Detailed Solution

While balancing a thermochemical equation,fractions can be used but it is not a necessary condition to use fractions while balancing ;2H2g+O2g→2H2Ol; ∆H=-572 kJ....1 ; H2g+12O2g→H2Ol; ∆H=-286 kJ....2 ; Both are thermochemical equations;
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Which of the following statement about thermochemistry is false?