Combining Boyle's law and Charles' law forms one presure-temperature-volume relationship and holds the mass of the gas constant. Which equation represents the relationship of the combined gas law?

(P1V1/T1)=(P2V2/T2)

I just took the test and this should be correct

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.

i think that the answer is c