The density of gaseous at and is . Hence, in the gaseous state exists primarily as a: (At. mass ) — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Calculated molar mass $M = dRT/P = (3.17 \times 0.0821 \times 300) / 1 = 78\text{ g/mol}$. The molar mass of a single $HF$ monomer is $1 + 19 = 20\text{ g/mol}$. The ratio is $78 / 20 \approx 3.9 \approx 4$, indicating it exists as a Tetramer $(HF)_4$.