Homework Help: Chemistry

Posted by tommy on Wednesday, October 27, 2010 at 12:06am.

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.

Chemistry - DrBob222, Wednesday, October 27, 2010 at 12:34am
How much heat is needed to heat the coffee?
q = mass water x specific heat water x (Tfinal-Tintial)

How much energy in 1 photon?
E = hc/wavelength.

Now set up a proportion.
(1 photon/E) = (#photons/q)
solve for # photons.

Answer this Question

Related Questions

Chemistry please help - Suppose that the microwave radiation has a wavelength of...
Chemistry! - Hey jiskha. Microwave ovens emit microwave radiation that is ...
More chemistry - Hey jiskha. Microwave ovens emit microwave radiation that is ...
chemistry - Suppose that the microwave radiation has a wavelength of 10.8 cm. ...
chemistry 121 - Microwave ovens use microwave radiation to heat food. The ...
CHEM - Suppose that the microwave radiation has a wavelength of 10.8 cm. How ...
chemistry - Suppose that the microwave radiation has a wavelength of 10.8 cm. ...
chem - Suppose that the microwave radiation has a wavelength of 10.8cm . How ...
chemistry 121 - Microwave ovens use microwave radiation to heat food. The ...
Chemistry - A particular microwave oven delivers 800 watts. (A watt is a unit of...

For Further Reading

First Name:
School Subject:
Answer: