# CHEMISTRY

posted by .

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 -

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 -

thanks a bunch!

## Similar Questions

1. ### chemistry 121

Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred to other components of the food. As the water becomes hotter, so does the food. Suppose that the microwave …
2. ### chemistry 121

Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred to other components of the food. As the water becomes hotter, so does the food. Suppose that the microwave …
3. ### More chemistry

Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength …
4. ### Chemistry!

Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength …
5. ### Physics

a large container holding 340g of water, initially 14°C is placed in a microwave oven. the magnetron in the microwave oven can produce 900W of electromagnetic radiation. the microwave is turned on for 3 minutes. assuming all microwave …
6. ### chemistry

A microwave oven heats by radiating food with microwave radiation which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 0.250 liter of water was placed in the oven …
7. ### chemistry

A microwave oven heats by radiating food with microwave radiation which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 0.250 liter of water was placed in the oven …
8. ### Chemistry

microwave ovens work by irradiating food with microwaves, which is absorbed by the water molecules in the food and is converted into heat. Assuming that microwave ovens emit radiation with a wavelength of 12.2cm, calculate how many …
9. ### chemistry

A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 200 mL of water was placed in the oven and …
10. ### Chemistry

Microwave ovens heat food by creating microwave electromagnetic radiation that is absorbed by water molecules in the food. Any material that does not have water in it will not absorb the radiation and will not get hot. Metals reflect …

More Similar Questions