<Tr> <Td> Chloride ion </Td> <Td> Aqueous </Td> <Td> Cl </Td> <Td> − 167.2 </Td> </Tr> <Tr> <Td> Chlorine </Td> <Td> Gas </Td> <Td> Cl </Td> <Td> 0 </Td> </Tr> <Tr> <Td_colspan="4"> Chromium </Td> </Tr> <Tr> <Td> Chromium </Td> <Td> Solid </Td> <Td> Cr </Td> <Td> 0 </Td> </Tr>

Define the standard enthalpy of formation of water