Homework Help: CHEMISTRY

Posted by Jake on Wednesday, October 31, 2007 at 3:00pm.

I don't even understand how this question works. How do I solve it?

A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. suppose an oven's microwave is 13.7 cm. a container w/ 175 mL of water was placed in the oven and the temp rose from 23.2 dgerees c to 98.7 degrees c. how many photons of this microwave radiation were required? assume all the energy from the radiation was used to raise the temp of the h20.

i would show some work but i don't even know where to begin. :[

CHEMISTRY - DrBob222, Wednesday, October 31, 2007 at 3:19pm
q absorbed by water = mass x heat capacity x delta T. Calculate amount of heat generated by oven. q will be in joules.
Then Energy = hc/lambda.
h is Planck's constant, c is speed of light in meters/sec and you have lambda (I guess 13 cm is lambda but you don't say that). That will give you energy of the microwave for 1 photon. You should be able to take it from there.
CHEMISTRY - Anonymous, Thursday, November 1, 2007 at 2:02am
thanks a bunch!

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