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In a measurement of quantum efficiency of photosynthesis in gree plants , it was found that 8 quanta of red light of 6850 `Å` were needed to evolve 1 moleculeof `CO_(2)`. The average energy storage in the photosynthesis process is 112 kcal `//` mol `O_(2)` evolved. Calculatethe percent efficiency of energy conversion in this experiment. |
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Answer» `E = ( hc)/( lambda)= ((6.63 xx 10^(-34)Js) ( 3 xx 10^(8)ms^(-1)))/( ( 6850xx 10^(-10)m)) = 2.90 xx 10^(-19)J` `:. `Energy of 8 quanta `= 8 xx 2.90 xx 10^(-9) J = 2.32 xx10^(-18) J` Energy stored per molecule `=( 112 xx 4.184 xx 10^(3)J mol^(-1))/(6.02 xx 10^(23)mol^(-1)) = 7.78 xx10^(-19)J` `:. %` efficiency of energy conversion`= ("Energy stored per molecule") /( "Energy needed per molecule ") xx 100` `= ( 7.78 xx 10^(-19))/( 2.32 xx 10^(-18)) xx 100 = 33.5%` |
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