What are two things that ligth energy has a role in photosyntesis

During photosynthesis, light energy is needed for two reactions:

1. The removal of electrons from water molecules. This process of taking away electrons is known as oxidation. Plants use light energy to propel oxidation of water.

2. Transfer of electrons to NADP+ . This process of adding electrons is known as reduction. Plants use  light energy to carry out reduction of NADP+.

These two reactions lead to formation of chemical energy. This energy is then used in the Calvin cycle to synthesize a three-carbon sugar from carbon dioxide that has been captured from the atmosphere.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g