The excitation of a particular molecule requires

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

15.0\,\text{kJ}\,\text{mol}^{-1}

. If

1.50\,\text{mmol}

of the substance is to be completely excited by light of

500\,\text{nm}

, what is the minimum number of photons needed? (a)

5.7 \times 10^{22}

(b)

9.0 \times 10^{20}

(c)

5.7 \times 10^{19}

(d)

5.7 \times 10^{16}