Calculate the energy of a light with a wavelength of 142 nm.

E =  0.14 ×10⁻¹⁷ J

Explanation:

Given data:

Wavelength of light = 142 nm (142 ×10⁻⁹ m)

Energy of light = ?

Solution:

Formula:

E = hc/λ

h = plancks constant = 6.63×10⁻³⁴ Js

c = speed of light = 3×10⁸ m/s

by putting values

E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 142 ×10⁻⁹ m

E = 19.89×10⁻²⁶ J.m/ 142 ×10⁻⁹ m

E =  0.14 ×10⁻¹⁷ J

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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.