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A typical microwave oven use microwave radiation with wavelength ?=12 cm. The microwave radiation is absorbed by water molecule, causing it to rotate, and the friction produced by these rotational motions heats the water and the food. A completely dehydrated food will not heat up in the microwave oven. (a) Calculate the microwave energy in Joule per photon and in Joule per mole of photon (J/mol). (b) How many moles of microwave photon must be absorbed by 1.0 g of water to raise its temperature by 1.0 ºC? (c) How many moles of microwave photon must a sample of 250-g water absorb to raise its temperature from 22 ºC to 100 ºC? (Avogadro's number = 6.02x10^23/mol; Planck's constant, h=6.63x10^-34 J.s; speed of light, c = 3.00x10^8 m/s; specific heat of water, Cp = 4.184 J/g. ºC)

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