If 2.6g of X occupy a volume of 1.12dm³ at S.T.P. Determine its molecular formula.

ITEM 2:

c) If 2.6g of X occupy a volume of 1.12dm³ at S.T.P. Determine its molecular formula.

• Step 1: Calculate the molar mass ($M_r$) of X. At S.T.P. (Standard Temperature and Pressure), 1 mole of any gas occupies $22.4 \text{ dm}^3$. We can find the molar mass using the given mass and volume: $$M_r = \frac{\text{mass}}{\text{volume}} \times \text{molar volume at S.T.P.}$$ $$$$