Question

What mass of oxygen is consumed when 1.73L of carbon dioxide (STP) are produced in the following equation.

C4H8 + 6 O2 > 4 CO2 + 4 H2O

please help and show your work. My answer for this problem is 11.12g/O2. I have no confidence in my answer.

Answer 1

Convert 1.73g CO2 to mols.

1.73 x (1 mol/22.4L) = ? mols CO2.

Using the coefficients in the balanced equation, convert mols CO2 to mols O2.
?mols CO2 x (6 mols O2/4 mols CO2) = ? mol CO2 x 6/4 = xx mol O2.

Now convert xx mols O2 to grams.
g O2 = mols O2 x molar mass O2 = zz.