Question

Calculate how many milliliters of carbon dioxide would be produced theoretically from 2.0g of sucrose at 25 deg Cel and 1 atm pressure.

Answer 1

Write the equation and balance it.

Convert 2.0 g sucrose to moles. moles = grams/molar mass

Using the coefficients in the balanced equation, convert moles sucrose to mols CO2.

Use PV = nRT to convert moles CO2 to volume in liters, then convert to mL.

Answer 2

I assume the combustion reaction

C12H24O11 + 18O2>> 12CO2 + 12H2O

So it appears that the ratio of moles CO2 to sucrose is 12:1.

Figure out how many moles of sucrose in 2 grams, multipy it by 12.

Then, V=mole*R*Temp/Pressure

Watch units.

Answer 3

ok...i got the balanced equation to be:
C12H22O11 --> 4C2H5OH + 4CO2.

And then i got the moles of sucrose to be 2/342.296=0.005842moles...I'm stuck after this point. How do i convert this to moles of CO2? Do i just multiply this number by 4?

Answer 4

Bob, is it H24 or H22 for sucrose?

Answer 5

It's C12H22O11.
And if you are talking combustion reaction, you need to use Bob Pursley's equation.

Answer 6

Sorry...I'm actually talking of fermentation which is in the absence of oxygen. So my equation is right, correct?

Answer 7

yes.