The blue color in some fireworks occurs when copper(I) chloride is heated to approximately 1500 K and emits blue light of wavelength 4.50 X 10 squared nm. How much energy of one photon of this light carry?

Given that,

Temperature, T = 1500 K

Wavelength,

To find,

The energy of one photon of this light.

Solution,

We know that, the energy of a photon is given by the formula as follows :

So, the required energy is .

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.