The structure of hydrogen sulphide (Mr = 34.1 g mol-1) is analogous to water (Mr = 18.0 g mol-1). Despite having larger molecular mass than water, the boiling point of hydrogen sulphide at STP is -60.2°C whereas the boiling point of water is 99.61 °C under the same condition. Explain this observation.

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.