Posted by Mary on .
A cup of chicken soup (500.0 g) is heated from 20ºC to 98ºC in a microwave oven that operates at wavelength = 1.55 x 10–2 m. How many moles of photons are absorbed by the soup? Assume that the specific heat capacity of chicken soup is equal to that of water.

Chemistry 
DrBob222,
q = mass water x specific heat water x delta T = ?? Joules.
E = hc/wavelength.
Substitute h, c, and wavelength to calculate E (in joules/photon)
Convert to # photons, then divide by 6.022 x 10^23 to convert # photons to moles photons.