Define relative molecular mass.
T is an alcohol, $\text{C}_x\text{H}_y\text{O}$. A gaseous sample of T had a volume of $20\,\text{cm}^3$ at $120\,^{\circ}\text{C}$ and $100\,\text{kPa}$. It was completely burned in $200\,\text{cm}^3$ of oxygen, which was in excess. The final volume, taken under the same conditions as the gaseous sample, was $250\,\text{cm}^3$. Under these conditions, any water present is vapour. When the water vapour was removed from the gaseous mixture, the volume fell to $170\,\text{cm}^3$. Treating the remaining gaseous mixture with concentrated alkali to absorb carbon dioxide reduced the volume to $110\,\text{cm}^3$. The equation for the complete combustion of T can be represented as shown: $\text{C}_x\text{H}_y\text{O} + z\text{O}_2 \rightarrow x\text{CO}_2 + \frac{y}{2}\text{H}_2\text{O}.$
From the data provided, calculate the value of $x$.
From the data provided, calculate the value of $y$.
Complete the equation for the complete combustion of alcohol T: $\dots + \dots\text{O}_2 \rightarrow \dots\text{CO}_2 + \dots\text{H}_2\text{O}$.
Give the skeletal formulae for two possible structures of T, then name each alcohol.
Use the general gas equation to work out the mass of T in the original $20\,\text{cm}^3$ gaseous sample, which was measured at $120\,^{\circ}\text{C}$ and $100\,\text{kPa}$. Give your answer to three significant figures and show the working.