How many moles of photon would contain sufficient energy to raise the temperature of 245 g of water from 19· 5°C to 99-5°C? Specific heat of water is $4.2\mathrm{J}{/}^{\circ }\mathrm{C}-\mathrm{g}$ and frequency of light radiation used is $2.45\times {10}^{10}$ per second.

$\left(6.626\times 0.15=1.0,N_A=6\times {10}^{23}\right)$