## Test 2: Why is photosynthesis spontaneous?

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

Michelle Song 1G
Posts: 30
Joined: Wed Nov 14, 2018 12:23 am

### Test 2: Why is photosynthesis spontaneous?

Here is the exact statement:

The photosynthesis of glucose inside the chloroplast of an old growth Coastal Redwood tree.

I said deltaG > 0 and got it wrong.

PranitKumaran1F
Posts: 30
Joined: Thu Nov 08, 2018 12:17 am

### Re: Test 2: Why is photosynthesis spontaneous?

For that question, my TA said that you should assume that the free energy from the sun is included in the reaction for photosynthesis, so the net free energy after the reaction completes is less than zero.

BenJohnson1H
Posts: 68
Joined: Fri Sep 28, 2018 12:17 am

### Re: Test 2: Why is photosynthesis spontaneous?

So deltaH in the plant would be positive as it is absorbing heat, T would be a certain temp, 298K for example, and deltaS would also be positive?