First slide

Enthalpy of Combustion

Question

Which of the following statement about thermochemistry is incorrect?

Moderate

A

Heat of combustion is experimentally determined using bomb calorimeter
B

Lattice Enthalpy of ionic compounds is calculated applying Hess law
C

A thermochemical equation must be balanced using fractions only
D

Standard state of bromine is liquid

Solution

While balancing a thermochemical equation,
fractions can be used but it is not a necessary condition to use fractions while balancing ;
$2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l); ∆ H = - 572 kJ . . . . (1); H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l); ∆ H = - 286 kJ . . . . (2); Both are thermochemical equations;$

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