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! gram of dry green algae absorbs 4.7 * 10 -3 mole of CO 2 per hour by photosynthesis. If the fixed carbon atoms were all stored after photosynthesis as starch, (C 6 H 10 O 5 ),how lon would it take for the algae to double their own weight assuming photosynthesis takes place at constant rate?

! gram of dry green algae absorbs 4.7 * 10-3 mole of CO2  per hour by photosynthesis. If the fixed carbon atoms were all stored after photosynthesis as starch, (C6H10O5),how lon would it take for the algae to double their own weight assuming photosynthesis takes place at constant rate?

Grade:11

2 Answers

Abhinav Acharya
20 Points
9 years ago
*1 gram of dry...
nitesh gupta
8 Points
9 years ago
Moles of CO2 absorbed = 4.7 x 10-3
Since one mole of CO2 has one mole of C while one mole of starch require 6 moles of C.

therefore amount of starch formed in one hour = 4.7 x 10-3 / 6 moles

Weight of starch formed in one hour = 162 x 7.83 x 10-4\
                             = 0.1269gm

For algae to double its weight, it should gain 1 gm
therefore, time require to double its weight = 1/.1269
                                 = 7.88 hrs

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