When a substance a was exposed to light, 0.002 mole of it reacted in 20 minutes and 4 seconds. in the same time a absorbed 5 2.0x 10 photons of light per second

When a substance A was exposed to light, 0.002 mole of it reacted in 20 minutes and 4 seconds. In the same time A absorbed 5 2.0x 10 photons of light per second. Quantum yield of the reaction is x 101 Calculate x. (Avogadro number N = 6.02 x 10-