Question 2 Scm exploded in combustion wi arygen. The resulting gaseous cooled and then agitated with KOH solution. There was a \( 15 \mathrm{~cm}^{3} \) and the residual measured to be \( 45 \mathrm{~cm}^{3} \), calculat a) the molecular formula and b) the vapour density of the \( h \)

When sulfur compounds combust in oxygen, they produce sulfur dioxide and water vapor as the main products. In this scenario, the cooled gaseous mixture is agitated with potassium hydroxide (KOH), which absorbs sulfur dioxide. The initial volume of the gas before KOH treatment was 60 cm³ (15 cm³ plus 45 cm³), indicating the amount of gas absorbed by KOH provides insights into sulfur's contribution. A molecular formula could be derived from the stoichiometry of the products formed along with the residual volume after treatment. To calculate the vapor density of the gas, you would typically use the formula for vapor density, which is the molar mass of the gas divided by the molar volume of an ideal gas under standard conditions (usually taken as 24 L/mol at 25°C). By determining the molar mass from the molecular formula calculated earlier, you can easily find the vapor density and relate it back to the gas' composition.