Chemistry!

posted by .

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 of 12.7 cm. How many photons are required to heat 200. mL of coffee from 21°C to 63°C?

I have no clue where to start.

• Chemistry! -

No

• Chemistry! -

E = hc/wavelength = xx J energy of 1 photon.

How much energy do you need?
q to heat coffee. = mass water x specific heat water x delta T = ?? joules total needed.

so how many of those photons will you need?

?? J/photon x # photons = ??total joules needed.
So you

Similar Questions

1. CHEMISTRY

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

I am having a problem with this problem from my homework. I need some help on this problem. Microwave ovens work by irradiating food with microwave radiation, which is absorbed and converted into heat. Assume radiation with wavelength=15.0cm …
3. 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 …
4. 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 …
5. 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 …
6. AP Chemistry

Microwave ovens emit microwave radiation that is absorbed by water as heat. Suppose that the wavelength of the radiation that is 12.5 cm in an oven that has a power rating of 900 watts. (1W = 1 J/s) a) How many moles of photons are …
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

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 …
9. 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 …
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