Bioethanol, C2H5OH, is produced by the fermentation of glucose, C6H12O6, according to the following equation - VCE - SSCE Chemistry - Question 10 - 2018 - Paper 1

From the reaction equation:

$C6H12O6 \rightarrow 2C2H5OH + 2CO2$

We see that 2 moles of C2H5OH are produced for every 2 moles of CO2. Therefore, the moles of C2H5OH produced are the same as the moles of CO2:

$n_{C2H5OH} = n_{CO2} \approx 0.129 \text{ mol}$.

Using the equation again:

$m = n \times M$

where $M$ for C2H5OH is approximately 46.08 g/mol. Thus,

$m_{C2H5OH} = 0.129 \text{ mol} \times 46.08 \text{ g/mol} \approx 5.94 \text{ g}$.

Based on the calculations, the mass of C2H5OH obtained is approximately 5.94 g. Therefore, the correct answer is D. 5.94 g.