1. The photosynthesis reaction is: 6 CO 2 (g) + 6 H 2 O (l) ßà C 6 H 12 O 6 (s)
ID: 524428 • Letter: 1
Question
1. The photosynthesis reaction is:
6 CO2 (g) + 6 H2O (l) ßà C6H12O6(s) + 6 O2 (g)
If the reaction is at equilibrium, state the effect that each of the following changes will have on the equilibrium composition: shift toward formation of reactants, shift toward formation of products, or no effect. (5 pts)
a. The partial pressure of oxygen gas is increased
b. The system is compressed
c. The amount of carbon dioxide is increased
d. Water is added
e. Some of the C6H12O6 is removed
Explanation / Answer
a. The partial pressure of oxygen gas is increased
if we increase O2 P, the product, then we will shift toward th eleft, i.e. more CO2 and H2O will be produced
b. The system is compressed
P decreases, so this favours least mol of gas formation,
ratio is 6 mol of ga s= 6 mol of gas, so no effect
c. The amount of carbon dioxide is increased
if we decrease a reactant, the shift will go from right to LEFT
d. Water is added
since water is in liquid state, no effect will appear, since water does not appears in the K expression
e. Some of the C6H12O6 is removed
since this psecies is in solid state, no effect will appear, since water does not appears in the K expression
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