Phosphine, ph3(g), decomposes according to the equation 4ph3(g) --> p4(g) + 6h2(g) the kinetics of the decomposition of phosphine at 950 k was followed by measuring the total pressure in the system as a function of time. the data to the right were obtained in a run where the reaction chamber contained only pure phosphine at the start of the reaction.

good luck with that. I thought I had it, but it was not right.

it should be all of them because it asks if you included all of those in your answer

explanation:

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.