Question

1. The value of the constant Kc does or does not depend on the temperature. -Depends -Doesn't depend

2. Review the nature of light (section 6.1 in Chemistry, The Central Science, 12 ed). Calculate the frequency of light at 428 nm, the peak of the yellow form of HBB. Answer with 3 SF with units of 1/sec, expressed in scientific notation.

3. Calculate the energy of one photon (one quantum of light) for the frequency of light at 428 nm (the peak of the yellow form). Answer in scientific notation with 3 SF and units of Joules.

Answer 1

1) Depends on temperature

2)

= 428 nm = 428 x 10^-9 m

v = C /

     = 3 x 10^8 / 428 x 10^-9

      = 7.01 x 10^14 sec-1

frequency = 7.01 x 10^14 sec-1

3)

frequency = 7.01 x 10^14 sec-1

E = N h v

E = (6.023 x 10^23 ) x (6.625 x 10^-34) x (7.01 x 10^14)

E = 2.80 x 10^2 J / mol