completely dissolve mg of AL with 2 liters of 0.15M dd HCl to obtain V liters of H2 gas (dktc). Calculate V and m

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.

it is stable as it is in group 0 which have full outer shells of electrons