Charter 9 html G Google G one suon cuie. V teiter Y MIen niatne welcome, Nathan-

Question

Charter 9 html G Google G one suon cuie. V teiter Y MIen niatne welcome, Nathan-.. (10) YouTube Yahoo Help Save & E Homework 3 attempts left Check my work Be sure to answer all parts. By using photons of specifie wavelengths, chemists can dissociate gaseous HI to produce H atoms with certain speeds. When HI dissociates, the H atoms move away rapidly, whereas the heavier I atoms move more slowly. (a) If a photon of 230. nm is used, what is the excess energy (in J) over that needed for dissociation? (b) If this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)? (Bond energy of H-I is 295 kJ/mol.) Enter your answers in scientific notation. x 10 (seleet mis MacBook Air 80 ? /2 F5 F6

Explanation / Answer

Plank Constant (h) = 6.62607004 × 10-34 m2 kg / s

(a) Wavelength(?)= 230nm

Speed of light(c)= 3.0 x 108 m/s

Energy with photons are bombarded with(E1) = hc/?= 6.854×10-19  Joules

Dissociation Energy(in J)(E2)= Dissociation Energy / Avogadro no. = 295×103/6.022×1023=4.898×10-19 Joule

Excess Energy=E1-E2=1.956×10-19  Joules

(b)If excess energy is carried away by the H atom then KE for H-atom =>

Mass of 1 mol of H atoms=1.008gm

Mass of 1 H atom = 1.008/6.022×1023= 1.673×10-24

KE=Excess Energy

(1/2)mv2=1.956×10-19

mv2=3.912×10-19

v2=3.912×10-19/1.673×10-24

v2=1.907×105

v=436.692 m/sec

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