First slide

Thermochemical equation, Standard states

Question

Enthalpy is the heat content of the system at constant pressure. Standard enthalpy is zero for

Moderate

A

$H_{2} (g)$
B

${NH}_{3} (g)$
C

${CO}_{2} (g)$
D

All of these

Solution

Standard Enthapy is zero for elements not for compounds;
Standard enthalpy of $H_{2} (g), S (α), C (graphite), {Br}_{2} (l), Na (s) etc . . . . zero;$
Standard enthalpy of a compound is equal to its standard entalpy of formation;

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