Any number of green plants can photosynthesize glucose (C_6 H_12 O_6) from carbo

Question

Any number of green plants can photosynthesize glucose (C_6 H_12 O_6) from carbon dioxide and water, producing oxygen as the remaining product. In an experiment in a biochemistry lab, 0.917 grams of glucose was produced in such an experiment. Calculate the volume of oxygen produced if it was collected over water at 42.0 degree C and at a pressure of 736 Torr. The vapor pressure of water at 42.0 degree C is approximately 0.0987 atmospheres. Also, many grams of carbon dioxide were used in this biosynthesis?

Explanation / Answer

m = 0.917 g of glucose

mol = mass/MW = 0.917 /180 = 0.005094444 mol of glucose

find V of O2 required

if

6 CO2 + 6 H2O = C6H12O6 + 6 O2

moles of O2:

1 mol of glucose = 6 mol of O2

0.005094444 mol of glucse = 0.005094444 *6 = 0.0305666 mol of O2

PV = nRT

V = nRT/P

P fix = 736 - 0.0987*760 = 660.988 mm Hg

V = (0.0305666 )(62.3)(42+273)/660.988 = 0.907511 L = 907 mL

then

CO2 used:

1 mol of glucose = 6 mol of CO2

0.005094444 mol = 0.005094444 *6 = 0.030566664 mol of CO2

mass = mol*MW = 0.030566664*44 = 1.34493 g of CO2

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