a)
number of mol of Ice = mass/molar mass
                   Â
= 3/18
                   Â
= 1/6 mol
heat required = heat of fusion * number of
mol
            Â
= 6.00 KJ/mol * (1/6)mol
            Â
= 6.00 KJ
            Â
= 6000 J
energy of 1 photon = h*c/wavelength
                 Â
= (6.626*10^-34)*(3*10^8)/(6.27*10^-6)
                 Â
=3.17*10^-20 J
number of photon = 6000 J / (3.17*10^-20)
                Â
= 1.89*10^23
Answer: 1.89*10^23
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