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Photosynthesis reactions in green plants use carbon dioxide and water to produce glucose (C6H12O6) and oxygen. A plant has 88.0 g of carbon dioxide and 64.0 g of water available for photosynthesis. Determine the limiting and excess reactants.6CO2 + 6H2O ⇨ C6H12O6 + 6O2



Answer :

Step 1

The reaction involved:

6 CO2 + 6 H2O ⇨ C6H12O6 + 6 O2 (completed and balanced)

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Step 2

Information provided:

88.0 g CO2

64.0 g water (H2O)

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Information needed:

The molar masses of:

CO2) 44.0 g/mol

H2O) 18.0 g/mol

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Step 3

Procedure:

By stoichiometry,

6 CO2 + 6 H2O ⇨ C6H12O6 + 6 O2

6 x 44.0 g CO2 ---------------------- 6 x 18.0 g H2O

88.0 g CO2 ---------------------- X

X = 88.0 g CO2 x 6 x 18.0 g H2O/6 x 44.0 g CO2

X = 36 g H2O

For 88.0 g of CO2, 36 g of H2O is needed, but there is 64.0 g of water.

Therefore, the excess reactant is H2O and the limiting reactant is CO2.

Answer:

The limiting reactant = CO2

The excess reactant = H2O

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