We have that the work function of the metal

From the Question we are told that
UV radiation (λ = 162 nm)
Kinetic energy 
Generally the equation for Kinetic energy is mathematically given as


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A mole of CO2 = 2 moles of O2
8 CO moles x 2 =
16 moles
D. divide 4.56 by molar mass of mg(OH)2