The energy required to dislodge electrons from rubidium metal via the photoelectric effect is 218 kJ/mol . What wavelength (in nm) of light has sufficient energy per photon to dislodge an electron from the surface of rubidium

answer; talc and gypsum;

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 tornado but not 100%