10. (02.05 MC) The graph shows a sample of gas when it is hot, cold, and at room temperature,
В
Number of Particles
Energy
Which statement is correct about curves A and C? (5 points)
A represents hot gas and represents cold gas
A represents cold gas and represents hot gas
A represents gas at room temperature and represents hot gas.
A represents gas at room temperature and represents cold gas

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.