What happens when a piston is used to decrease the volume of a contained gas? a. Fewer gas particles exert a force on the piston.
b. The piston’s pressure on the gas becomes greater than the pressure exerted by the gas on the piston.
c. Gas particles collide more frequently.
d. Gas particles leak out of the container.

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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.

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