Chemistry: Photon problem?

william

New member
I'm having trouble getting this problem:

Microwaves cook by emitting radiation with a frequency of 2.45x109s-1. Calculate the number of photons required to raise 274.0 g H2O from 29 C to 100 C, its boiling point. Assume the heat capacity of water is constant over this temperature range and is equal to 4.2 J/g-K.

Thank you
 
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