Photosynthesis is a process by which light energy gets funnelled into creating chemical potential for generation of proton gradients across membranes. Suppose photosynthesis is only 0.5% efficient in creating such gradients, calculate how many moles of photons will be required such that λhc=643×1017J−1 to create a pH gradient (per mole) as shown below across a cellular membrane under ambient temperature of 300 K?