An unknown gas has a density of at STP

CHEMISTRY · Multi-part · CBSE · Chemistry · Some Basic Concepts of Chemistry · Some Basic Concepts of Chemistry

Problem

An unknown gas

X

has a density of

2.82\text{ g dm}^{-3}

at STP. A

4.00\text{ g}

sample of

X

was combusted in excess oxygen to produce

2.50\text{ g}

of hydrogen fluoride and

2.84\text{ dm}^{3}

of carbon dioxide at STP. Determine the following for

X

: (a) Molar mass (b) Empirical formula (c) Molecular formula