What type of weather does low air pressure bring

Bad weather

Explanation: In a low pressure system warm air pushes up and replaces the cooler air as it sinks down. The air temperature increases which makes more space for water vapor to occupy so the humidity increases as well. Higher humidity means more amount of water vapor which forms clouds resulting into bad weather.

b is the correct answer

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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.