131 CH3OH(g) + C0( 3 ) + 2 H (g) HP = +91 kJ/mol rxn The reaction represented above goes essentially to completion. The reaction takes place in a rigid insulated vessel that is initially at 600 K A sample of CH, OH is placed in the previously evacuated vessel with a pressure of P1 at 600 K. What is the final pressure in the vessel after the reaction is complete and contents of the vessel are returned to 600 K?
A. P1/9 B. P1/3 C. P1 D. 3P1

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

we need the questions , i may then you.

there is none because earth is stationary and flat.

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.