In a photochemical reaction A→B+C, the quantum efficiency with 500 nm light is 1.2×102 mole einstein−1. After exposure of 200 mmol of A to the light, 1.77 mmol of B is formed. How many photons were absorbed by A?
1
1.5× 10-5
2
1.5× 10-4
3
2.5× 10-4
4
2.5× 10-5