Photosystem 1 converts light into chemical energy. energy, in the form of photons, is adsorbed by the chlorophyll complex, p700, which donates an electron to a series of modified chlorophyll/phylloquinone complexes that are often just designated ax . the electron is passed down an electron-transport chain, at the end of which nadp+ is reduced. the reduction potentials of p700+, ax , and nadp+ at ph 7.0 and 25oc are 0.490 v, 0.900 v and -0.350 v, respectively. what is δgo in kj/mol at ph 7.0 and 25oc of the reaction:

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol