Homework Help: Chemistry please help

Posted by Saira on Monday, November 3, 2008 at 9:51pm.

Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 255 mL of coffee from 25.0 C to 62.0 C? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 J/(g/ K), as water over this temperature range.

I am not sure how to find the answer

Chemistry please help - Saira, Monday, November 3, 2008 at 10:32pm
NVM got it
Chemistry please help - DrBob222, Monday, November 3, 2008 at 11:35pm
Energy/photon = hc/wavelength.
Remember to change wavelength meters and use c in m/s.

heat required = mass x density x specific heat x delta T. Everything is here to calculate heat required.

Knowing heat/photon and the total energy required you can calculate the number of photons required.

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